Study to Assess Adverse Events and Change in Disease Activity in Adult Participants With Select Advanced Solid Tumor Indications Receiving Intravenous (IV) ABBV-400

Cancer is a condition where cells in a specific part of body grow and reproduce uncontrollably. The purpose of this study is to assess adverse events and change in disease activity when ABBV-400 is given to adult participants to treat advanced solid tumors.

ABBV-400 is an investigational drug being developed for the treatment of advanced solid tumors. Study doctors put the participants in groups called cohorts. Cohorts 1-8 receive ABBV-400 alone (monotherapy) followed by a safety follow-up period. Cohort 9 receives ABBV-400 in combination with a strong CYP3A3 inhibitor (ITZ) followed by a safety follow-up period. Approximately 285 adult participants with hepatocellular carcinoma (HCC), pancreatic ductal adenocarcinoma (PDAC), biliary tract cancers (BTC), esophageal squamous cell carcinoma (ESCC), triple negative breast cancer (TNBC), hormone receptor+/human epidermal growth factor receptor 2 negative (HER2-) breast cancer (hormone receptor-positive [HR+]/HER2-breast cancer [BC]), head and neck squamous-cell-carcinoma (HNSCC), Platinum Resistant High Grade Epithelial Ovarian Cancer (PROC)/primary peritoneal/fallopian tube cancer, or advanced solid tumors, will be enrolled in the study in approximately 54 sites worldwide.

In cohorts 1-8, participants with the following advanced solid tumor indications: HCC, PDAC, BTC, ESCC, TNBC, HR+/HER2-BC, HNSCC, and PROC/primary peritoneal/fallopian tube cancer will receive intravenous (IV) ABBV-400 monotherapy and in cohort 9 participants will receive intravenous (IV) ABBV-400 and an oral solution of ITZ, for up to 3 years during and up to the treatment period with an additional safety follow-up period of up to 2 years.

There may be higher treatment burden for participants in this trial compared to their standard of care. Participants will attend regular visits during the study at an approved institution (hospital or clinic). The effect of the treatment will be frequently checked by medical assessments, blood tests, questionnaires and side effects.

Radiology Registry on Pancreatic Malignancies

The purpose of this study is to collect all radiological data which evaluated with clinical data may help assess malignancy and prognosis of pancreatic disease.This registry aims to collect retrospective data from 2014 and prospective data until 2027 with a maximum follow-up of 3 years per patient.

Genes as Predictors of Response to Gemcitabine, Docetaxel, and Capecitabine (GTX) in Metastatic or Unresectable Pancreatic Cancer.

This is a study for patients with advanced pancreatic cancer, using the drugs gemcitabine, docetaxel and capecitabine. Gemcitabine is a drug that has been approved by the FDA. Gemcitabine is been approved for treatment of cancer of the pancreas. It is also approved for treatment of lung cancer in combination with another drug called cisplatin. Docetaxel is a drug approved by the FDA. Docetaxel is approved for treatment of breast and lung cancer. Capecitabine is a drug approved by the FDA for treatment of cancer of the colon and rectum. This study will measure the levels of certain substances in participant's tumors. These substances (called genes, which are the cell's blueprint for these substances) affect how people's bodies react to the cancer drugs. Genes will also be measured in participant's blood. The purpose of this study is to see if these substances can predict survival and response in patients receiving the study drugs. In this study we wish to find out how long it takes for patients' cancers to worsen, and how long they survive after receiving the study drugs. The side effects of the combination of gemcitabine, docetaxel and capecitabine will also be evaluated.

RPSA as a Potential Prognostic Biomarker of Pancreatic Cancer

PDAC (Pancreatic ductal adenocarcinoma) represents 90% of pancreatic tumors. The prognosis of PDAC remains poor at this time. Its management is based on surgery for early stages, associated with neoadjuvant and adjuvant chemotherapy. However, around 80% of patients will relapse after surgery. There is a lack of efficient biological biomarkers of PDAC, especially for prognosis. To date, CA19-9 is commonly used despite its lack of sensitivity and specificity.

Ribosomal protein SA (RPSA) is a transmembrane receptor localized at the cell surface but also in the cytosolic and nuclear regions. RPSA interacts with many proteins in the extracellular matrix (ECM), including laminin-1 and elastin. RPSA in involved in different cellular functions such as cell adhesion, migration, proliferation and differentiation. The expression of RPSA is increased in many cancers including breast, lung, prostate, pancreatic, etc. It could represent a molecular biomarker of tumor invasion and metastatic abilities. Moreover, the concentration of RPSA could be measured in the serum of patients with PDAC. Recent data suggest that a modification of the RPSA concentration could be a prognostic biomarker of PDAC.

QUILT-3.088: NANT Pancreatic Cancer Vaccine

QUILT-3.088 NANT Pancreatic Cancer Vaccine: Phase II Randomized Trial of the NANT Pancreatic Cancer Vaccine vs. Standard-of-Care as First- Line Treatment for Patients with Metastatic Pancreatic Cancer.

Dose Escalation/Expansion Study of Mavrostobart (PT199), an Anti-CD73 MAb, Administered Alone and in Combination with a PD-1 Inhibitor or Chemotherapy (the MORNINGSTAR Study)

This is a first-in-human, Phase 1/2, open-label, study designed to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics, and preliminary efficacy of Mavrostobart (PT199) alone and in combination with a PD-1 inhibitor or chemotherapy.

First-line Regimen With QL1706 Plus Chemo ± Bev in PDAC Patients

This is a multicenter, open-label, exploratory study to evaluate the efficacy and safety of QL1706 plus nab-paclitaxel and gemcitabine with or without bevacizumab as first-line treatment in patients with unresectable locally advanced or metastatic pancreatic cancer

A Clinical Trial Evaluating the Effect of Pharmacological Ascorbate on Radiation Therapy for Pancreatic Cancer Patients

Radiation therapy improves cancer cure rates by killing cancer cells but it also contributes to long-term side effects in cancer survivors by unintentionally damaging normal organs such as the intestine. This research will what side effects patients with cancer experience, if high dose vitamin C helps reduce these side effects, and if high dose vitamin C increases the survival of patients with pancreatic cancer. We will meet with patients during the study to better understand their experience during their cancer treatment. In the long term, our research could provide a new way help cancer survivors avoid many permanent side effects of cancer treatments.

Clinical Evaluation Of Needle-based Confocal Laser Endomicroscopy in Cystic Tumors of the Pancreas

This study focuses on pancreatic cysts, especially malignant pancreatic cysts. The primary hypothesis of the study is that using nCLE in addition to EUS-FNA and tissue sampling allows better characterization of pancreatic cysts and improves appropriate therapeutic decision-making. For physicians, integrating nCLE into the diagnostic algorithm of pancreatic cysts could impact patient management by: Ruling out malignancy for patients with benign appearing nCLE images. Characterizing more malignant tumors in the pancreas.

Adjuvant Chemoradiation Following Radical Resection of Pancreatic Ductal Adenocarcinoma, a Prospective Cohort Study

This is a prospective observation cohort study to evaluate efficacy of different types of adjuvant therapy strategies, including chemoradiotherapy, chemotherapy alone, or no adjuvant treatment, for pancreatic ductal adenocarcinoma patients who received surgical resection of primary cancer.