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2010-06
2010-09
2010-09
2323608
NCT01236053
GlaxoSmithKline
GlaxoSmithKline
OBSERVATIONAL
Cancer in Patients With Gabapentin (GPRD)
High doses of gabapentin are associated with pancreatic acinar cell tumors in rats, but there has been no post marketing pancreatic carcinogenicity signal with gabapentin as reported by spontaneous reports in AERS or in the published literature. In a published case-control screening study of the association of gabapentin with 55 cancers, the only cancer that met the screening criteria for possibly increased cancer risk with gabapentin exposure was renal (including renal pelvis) cancer. This association was judged to be likely due to or substantially accentuated by confounding by cigarette smoking, hypertension, and lifestyle (Cancer Causes Control 2009;20:1821-1835). The relationship between gabapentin exposure and pancreatic cancer and renal cancer is studied in NCT01138124, and supplemental analyses for these cancers are performed in the current study. The FDA recommended GSK also study the relationship between gabapentin and all-cancer sites, as well as cancer at the following specific sites: 1) stomach, 2) anus, anal canal, and anorectum, 3) lung and bronchus, 4) bones and joints, 5) breast, 6) penis, 7) urinary bladder, and 8) other nervous system. The primary objective of this study is to determine whether exposure to gabapentin is associated with an increased risk of developing all-cancer, and these specific cancers in the United Kingdom (UK) General Practice Research Database (GPRD). Each member of the UK population is registered with a General Practice, which centralizes the medical information not only from the general practitioners themselves but also from specialist referrals and hospital attendances. Over 487 General Practices contribute data to the GPRD. The study cohort from which cases and controls are drawn is all subjects in the GPRD 1993-2008. Gabapentin was approved in the UK in May 1993. Entry into the study cohort begins Jan 1, 1993 for all those who are registered in GPRD before that time, and at the time of registration if later than Jan 1, 1993. Subjects are excluded from the GPRD cohort if they have a cancer diagnosis or a history of cancer prior to the cohort entry date. Patients with a first diagnosis of the respective cancer 1995-2008 are risk set matched with up to 10 controls within the same General Practice for age at cohort entry (within two years), sex, and year of entry into the study cohort (within one year). For cases, the index date is the date of first diagnosis of the respective cancer. The index date for controls is set as the date at which the follow-up time from cohort entry is the same as the case. The index date is chosen so as to give the control equal follow-up time to that of the case for ascertainment of use of gabapentin. Cases and controls will be required to have at least 2 years of follow-up in the study cohort before their index date. Cases must have no history of any other cancer diagnosis prior to the index date. Controls are required to be free of cancer diagnosis in the database up to the control's index date. Data on gabapentin prescriptions are obtained for cases and controls from study cohort entry to the index date. Gabapentin exposure will be assessed as ever/never, number of prescriptions, cumulative dose, and cumulative duration, with a 2 year lag period incorporated to control for protopathic bias (gabapentin prescription for initial pain symptoms of undiagnosed cancer) and latency (time between cancer onset and specific GPRD cancer diagnosis). Crude and adjusted odds ratios and 95% confidence intervals (CI) will be produced from conditional logistic regression models, with additional analyses evaluating for dose-response. Covariates include indications for gabapentin use and risk factors for each cancer.
Actual number of patients may be less, as it is possible for a patient to be represented in more than one of the 22 arms (See "Participant Flow: Overall Study" Table) because of the risk set sampling.
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
| Study Registration Dates | Results Reporting Dates | Study Record Updates |
|---|---|---|
2010-10-14 | 2011-07-01 | 2017-06-06 |
2010-11-04 | 2011-07-07 | 2017-07-06 |
2010-11-07 | 2011-08-04 | 2017-06 |
This section provides details of the study plan, including how the study is designed and what the study is measuring.
Primary Purpose:
N/A
Allocation:
N/A
Interventional Model:
N/A
Masking:
N/A
Arms and Interventions
| Participant Group/Arm | Intervention/Treatment |
|---|---|
| : UK GPRD 1993-2008 The study cohort from which cases and controls are drawn is all subjects in the United Kingdom (UK) General Practice Research Database (GPRD) 1993-2008. Each member of the UK population is registered with a General Practice, which centralizes the medical | DRUG: Gabapentin prescriptions
|
| Primary Outcome Measures | Measure Description | Time Frame |
|---|---|---|
| Number of All-Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incidence of all cancers. Gabapentin Exposure Description: Without 2 year lag = Gabapentin prescription from cohort entry to index date. With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). | The case index date was the date of incident cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of All-Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incidence of all cancers. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), Tertile 3 (8-298 prescriptions). Tertiles without 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), and Tertile 3 (8-388 prescriptions). | The case index date was the date of incident cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of All-Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incidence of all cancers. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.56 months), and Tertile 3 (5.57 - 105.82 months). Tertile's without 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.72 months), and Tertile 3 (5.73 - 123.70 months). | The case index date was the date of incident cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of All-Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incidence of all cancers. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of All-Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incidence of all cancers. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 9600.0 grams). Tertile's without 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 11610.0 grams). | The case index date was the date of incident cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Stomach Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident stomach cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. | The case index date was the date of incident stomach cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Stomach Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident stomach cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (1-2 prescriptions [prescrip]), T 2 (3-7 prescrip), T 3 (8-298 prescrip). Tertiles without 2 yr lag: T 1 (1-2 prescrip), T 2 (3-7 prescrip), and T 3 (8-388 prescrip). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident stomach cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Stomach Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident stomach cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.01-1.38 months [mo.]), T 2 (1.3-5.56 mo.), and T 3 (5.57-105.82 mo.). Tertiles without 2 yr lag: T 1 (0.01-1.38 m.), T 2 (1.39-5.72 mo.), and T 3 (5.73-123.70 mo.). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident stomach cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Stomach Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident stomach cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident stomach cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Stomach Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident stomach cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.1-30.0 grams [g]), T 2 (30.1-189.0 g), and T 3 (189.1-9600.0 g). Tertiles without 2 yr lag: T 1 (0.1-30.0 g), T 2 (30.1-189.0 g), and T 3 (189.1-11610.0 g). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident stomach cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Anal Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident Anal cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. | The case index date was the date of incident anal cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Anal Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident anal cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (1-2 prescriptions [prescrip.]), T 2 (3-7 prescrip.), T 3 (8-298 prescrip.). Tertiles without 2 yr lag: T 1 (1-2 prescrip.), T 2 (3-7 prescrip.), and T 3 (8-388 prescrip.). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident anal cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Anal Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident anal cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.01-1.38 months [mo.]), T 2 (1.39-5.56 mo.), and T 3 (5.57 -105.82 mo.). Tertiles without 2 yr lag: T 1 (0.01-1.38 mo.), T 2 (1.39-5.72 mo.), and T 3 (5.73-123.70 mo.). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident anal cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Anal Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident anal cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident anal cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Anal Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident anal cancer. Gabapentin (Gaba.) Exposure Description: With 2 yr lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.1-30.0 grams [g]), T 2 (30.1-189.0 g), and T 3 (189.1-9600.0 g). Tertiles without 2 yr lag: T 1 (0.1-30.0 g), T 2 (30.1-189.0 g), and T 3 (189.1-11610.0 g). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident anal cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Lung Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident lung cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. | The case index date was the date of incident lung cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Lung Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident lung cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), Tertile 3 (8-298 prescriptions). Tertiles without 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), and Tertile 3 (8-388 prescriptions). | The case index date was the date of incident lung cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Lung Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident lung cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.56 months), and Tertile 3 (5.57 - 105.82 months). Tertile's without 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.72 months), and Tertile 3 (5.73 - 123.70 months). | The case index date was the date of incident lung cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Lung Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident lung cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident lung cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Lung Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident lung cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 9600.0 grams). Tertile's without 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 11610.0 grams). | The case index date was the date of incident lung cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Bone/Joint Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident bone/joint cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. Inestimable OR and 95% CI when no gabapentin-exposed cancer cases or no gabapentin-exposed controls at the exposure level. | The case index date was the date of incident bone/joint cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Bone/Joint Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident bone/joint cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (1-2 prescriptions [prescrip.]), T 2 (3-7 prescrip.), T 3 (8-298 prescrip.). Tertiles without 2 yr lag: T 1 (1-2 prescrip.), T 2 (3-7 prescrip.), and T 3 (8-388 prescrip.). Inestimable OR and 95% CI when no gaba.-exposed cases or controls at the exposure level. | The case index date was the date of incident bone/joint cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Bone/Joint Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident bone/joint cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.01-1.38 months [mo.]), T 2 (1.39-5.56 mo.), and T 3 (5.57-105.82 mo.). Tertiles without 2 yr lag: T 1 (0.01-1.38 mo.), T 2 (1.39-5.72 mo.), and T 3 (5.73-123.70 mo.). Inestimable OR and 95% CI when no gaba.-exposed cases or controls at the exposure level. | The case index date was the date of incident bone/joint cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Bone/Joint Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident bone/joint cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident bone/joint cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Bone/Joint Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident bone/joint cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.1-30.0 grams [g]), T 2 (30.1-189.0 g), and T 3 (189.1-9600.0 g). Tertiles without 2 yr lag: T 1 (0.1-30.0 g), T 2 (30.1-189.0 g), and T 3 (189.1-11610.0 g). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident bone/joint cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Breast Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident breast cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. | The case index date was the date of incident breast cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Breast Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident breast cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), Tertile 3 (8-298 prescriptions). Tertiles without 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), and Tertile 3 (8-388 prescriptions). | The case index date was the date of incident breast cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Breast Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident breast cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.56 months), and Tertile 3 (5.57 - 105.82 months). Tertile's without 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.72 months), and Tertile 3 (5.73 - 123.70 months). | The case index date was the date of incident breast cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Breast Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident breast cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident breast cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Breast Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident breast cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 9600.0 grams). Tertile's without 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 11610.0 grams). | The case index date was the date of incident breast cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Penile Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident penile cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. | The case index date was the date of incident penile cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Penile Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident penile cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (1-2 prescriptions [prescrip.]), T 2 (3-7 prescrip.), T 3 (8-298 prescrip.). Tertiles without 2 yr lag: T 1 (1-2 prescrip.), T 2 (3-7 prescrip.), and T 3 (8-388 prescrip.). Inestimable OR/95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident penile cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Penile Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident penile cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.01-1.38 months [mo.]), T 2 (1.39-5.56 mo.), and T 3 (5.57-105.82 mo.). Tertiles without 2 yr lag: T 1 (0.01-1.38 mo.), T 2 (1.39-5.72 mo.), and T 3 (5.73-123.70 mo.). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident penile cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Penile Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident penile cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident penile cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Penile Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident penile cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.1-30.0 grams [g]), T 2 (30.1-189.0 g), and T 3 (189.1-9600.0 g). Tertiles without 2 yr lag: T 1 (0.1-30.0 g), T 2 (30.1-189.0 g), and T 3 (189.1-11610.0 g). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident penile cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Bladder Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident bladder cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. | The case index date was the date of incident bladder cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Bladder Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident bladder cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), Tertile 3 (8-298 prescriptions). Tertiles without 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), and Tertile 3 (8-388 prescriptions). | The case index date was the date of incident bladder cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Bladder Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident bladder cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.56 months), and Tertile 3 (5.57 - 105.82 months). Tertile's without 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.72 months), and Tertile 3 (5.73 - 123.70 months). | The case index date was the date of incident bladder cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Bladder Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident bladder cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident bladder cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Bladder Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident bladder cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 9600.0 grams). Tertile's without 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 11610.0 grams). | The case index date was the date of incident bladder cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case |
| Number of Other Nervous System Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident other nervous system cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. Inestimable OR and 95% CI when no gabapentin-exposed cancer cases or no gabapentin-exposed controls at the exposure level. | The case index date was the date of incident other nervous system cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his cohort entry was the same as case. |
| Number of Other Nervous System (ONS) Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident ONS cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (1-2 prescriptions [prescrip.]), T 2 (3-7 prescrip.), T 3 (8-298 prescrip.). Tertiles without 2 yr lag: T 1 (1-2 prescrip.), T 2 (3-7 prescrip.), and T 3 (8-388 prescrip.). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident other nervous system cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his cohort entry was same as for case. |
| Number of Other Nervous System (ONS) Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident ONS cancer. Gabapentin (Gaba.) Exposure Description: With 2 yr lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.01-1.38 months [mo.]), T 2 (1.39-5.56 mo.), and T 3 (5.57-105.82 mo.). Tertiles without 2 yr lag: T 1 (0.01-1.38 mo.), T 2 (1.39-5.72 mo.), and T 3 (5.73-123.70 mo.). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident other nervous system cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was same as for case |
| Number of Other Nervous System Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident other nervous system cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident other nervous system cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was same as for case |
| Number of Other Nervous System (ONS) Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident ONS cancer. Gabapentin (Gaba.) Exposure Description: With 2 year (yr) lag=Gaba. exposure from cohort entry to 2 yr prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 yr lag=Gaba. exposure from cohort entry to index date. Tertiles (T) with 2 yr lag: T 1 (0.1-30.0 grams [g]), T 2 (30.1-189.0 g), and T 3 (189.1-9600.0 g). Tertiles without 2 yr lag: T 1 (0.1-30.0 g), T 2 (30.1-189.0 g), and T 3 (189.1-11610.0 g). Inestimable OR and 95% CI when no gaba.-exposed cancer cases or controls at the exposure level. | The case index date was the date of incident other nervous system cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was same as for case |
| Number of Pancreatic Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident pancreatic cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. | The case index date was the date of incident pancreatic cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Pancreatic Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident pancreatic cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), Tertile 3 (8-298 prescriptions). Tertiles without 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), and Tertile 3 (8-388 prescriptions). | The case index date was the date of incident pancreatic cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Pancreatic Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident pancreatic cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.56 months), and Tertile 3 (5.57 - 105.82 months). Tertile's without 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.72 months), and Tertile 3 (5.73 - 123.70 months). | The case index date was the date of incident pancreatic cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Pancreatic Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident pancreatic cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident pancreatic cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case |
| Number of Pancreatic Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident pancreatic cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 9600.0 grams). Tertile's without 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 11610.0 grams). | The case index date was the date of incident pancreatic cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Renal Cancer Cases and Matched Controls With the Indicated Exposure to Gabapentin | Incident renal cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin prescription from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin prescription from cohort entry to index date. | The case index date was the date of incident pancreatic cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as for the case. |
| Number of Renal Cancer Cases and Matched Controls With the Indicated Number of Gabapentin Prescriptions | Incident renal cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), Tertile 3 (8-298 prescriptions). Tertiles without 2 year lag: Tertile 1 (1-2 prescriptions), Tertile 2 (3-7 prescriptions), and Tertile 3 (8-388 prescriptions). | The case index date was the date of incident renal cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Renal Cancer Cases and Matched Controls With the Indicated Duration of Exposure to Gabapentin | Incident renal cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.56 months), and Tertile 3 (5.57 - 105.82 months). Tertile's without 2 year lag: Tertile 1 (0.01 - 1.38 months), Tertile 2 (1.39 - 5.72 months), and Tertile 3 (5.73 - 123.70 months). | The case index date was the date of incident renal cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Renal Cancer Cases and Matched Controls With the Indicated Long Duration of Exposure to Gabapentin | Incident renal cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. | The case index date was the date of incident renal cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Number of Renal Cancer Cases and Matched Controls With the Indicated Cumulative Dose of Gabapentin | Incident renal cancer. Gabapentin Exposure Description: With 2 year lag = Gabapentin exposure from cohort entry to 2 years prior to index date (to control for prediagnostic prescribing for pain symptoms possibly related to cancer). Without 2 year lag = Gabapentin exposure from cohort entry to index date. Tertile's with 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 9600.0 grams). Tertile's without 2 year lag: Tertile 1 (0.1 - 30.0 grams), Tertile 2 (30.1 - 189.0 grams), and Tertile 3 (189.1 - 11610.0 grams). | The case index date was the date of incident renal cancer diagnosis ascertained in the GPRD study cohort 1995-2008. The matched control index date was the date at which the follow-up time from his/her cohort entry was the same as that for the case. |
| Secondary Outcome Measures | Measure Description | Time Frame |
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This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person’s general health condition or prior treatments.
Ages Eligible for Study:
ALL
Sexes Eligible for Study:
Accepts Healthy Volunteers:
This is where you will find people and organizations involved with this study.
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