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Genomic Aberrations and Pancreatic Cancer Subtypes


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Researchers have discovered detailed new genetic information about the subtypes of pancreatic cancer. A better understanding of the disease groups may lead to new treatment options and improved clinical outcomes for this lethal disease, Chan-Seng-Yue et al reported in Nature Genetics.

The study represents the most comprehensive analysis of the molecular subtypes of pancreatic cancer to date. Through detailed genomic and transcriptomic analyses, the research group identified five distinct subtypes of the disease—basal-like A, basal-like B, classical A, classical B, and hybrid—with unique molecular properties that could be targeted with novel chemotherapies, biologics, and immunotherapies.

“By rigorously analyzing advanced pancreatic cancers—which is the stage of disease that most patients have when they’re diagnosed—we were able to create a framework. This will help us develop better predictive models of disease progression that can assist in personalizing treatment decisions and lead to new targeted therapies.”
— Faiyaz Notta, PhD

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“Therapy development for pancreatic cancer has been hindered by an incomplete knowledge of the molecular subtypes of this deadly disease,” said lead author Faiyaz Notta, PhD, Co-Leader of the Ontario Institute for Cancer Research’s Pancreatic Cancer Translational Research Initiative (PanCuRx) and scientist at UHN’s Princess Margaret Cancer Centre. “By rigorously analyzing advanced pancreatic cancers—which is the stage of disease that most patients have when they’re diagnosed—we were able to create a framework. This will help us develop better predictive models of disease progression that can assist in personalizing treatment decisions and lead to new targeted therapies.”

COMPASS Trial

The study is based on data from more than 300 patients with both early-stage and advanced pancreatic cancer who participated in the COMPASS trial.

“Most pancreatic cancer research is focused solely on early-stage—resectable—tumors, but in reality, pancreatic cancer is often found in patients after it has advanced and spread to other organs,” said Dr. Notta. “COMPASS allowed us to look into these advanced cancers while treating these patients, develop a better understanding of the biology behind metastatic pancreatic cancer, and shed light on the mechanisms driving disease progression.”

Photo credit: Getty

More Findings

The basal-like A subtype, which had been difficult to observe before this study, was linked with a specific genetic abnormality. Most of the basal-like A tumors harbored several copies of a mutated KRAS gene, also known as a genetic amplification of mutant KRAS. The research group hypothesizes that some of the subtypes arise from specific genetic changes that occur as pancreatic cancer develops.

“This research opens new doors for therapeutic development,” said study author Steven Gallinger, MD, FRCSC, Co-Leader of PanCuRx, a surgical oncologist at UHN, and senior investigator at the Lunenfeld Tanenbaum Research Institute at Mount Sinai Hospital. “We look forward to capitalizing on the promise of these discoveries, building on our understanding of pancreatic cancer subtypes, and bringing new treatments to patients with the disease.”

Disclosure: This research by the Government of Ontario, the Wallace McCain Centre for Pancreatic Cancer, the Princess Margaret Cancer Foundation, the Terry Fox Research Institute, the Canadian Cancer Society Research Institute, the Pancreatic Cancer Canada Foundation, the Canadian Friends of the Hebrew University, and the Cancer Research Society. For full disclosures of the study authors, visit nature.com.

The content in this post has not been reviewed by the American Society of Clinical Oncology, Inc. (ASCO®) and does not necessarily reflect the ideas and opinions of ASCO®.
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