New Study Shows Celecoxib Benefit for PIK3CA-Mutated Colon Cancer

Patients with stage 3 colon cancer found that those with PIK3CA mutations who took celecoxib, an anti-inflammatory drug after surgery lived significantly longer.
These findings are the first clinical trial results to validate previous observations that adjuvant anti-inflammatory prostaglandin inhibitors, such as celecoxib, improve survival for PIK3CA-mutated colon cancer. (Representational Image: Wikimedia Commons)
These findings are the first clinical trial results to validate previous observations that adjuvant anti-inflammatory prostaglandin inhibitors, such as celecoxib, improve survival for PIK3CA-mutated colon cancer. (Representational Image: Wikimedia Commons)

An analysis of data from a randomized clinical trial for patients with stage 3 colon cancer found that those with PIK3CA mutations who took celecoxib, an anti-inflammatory drug after surgery lived significantly longer and had longer disease-free survival compared to those without the mutation. The study led by clinical investigators at Dana-Farber Cancer Institute and Brigham and Women’s Hospital highlights a potential breakthrough in personalized cancer treatment.

These findings are the first clinical trial results to validate previous observations that adjuvant anti-inflammatory prostaglandin inhibitors, such as celecoxib, improve survival for PIK3CA-mutated colon cancer. The results are published today in the Journal of Clinical Oncology.

These findings strengthen a growing body of evidence suggesting that prostaglandin inhibitors could benefit a subgroup of patients with colon cancer.

Jeffrey Meyerhardt, MD, MPH, senior author and co-director of the Colon and Rectal Cancer Center at Dana-Farber Cancer Institute

"They suggest a potential personalized approach to additional therapy for patients with early-stage colon cancer.”

After primary treatment for stage 3 colon cancer, patients typically receive adjuvant chemotherapy intended to reduce the risk of the cancer returning. In a subset of these patients, the cancer returns, and those patients have few treatment options. Through collaborative research across Dana-Farber and BWH, researchers are looking for ways to improve adjuvant therapies and stave off recurrence.

To investigate the use of celecoxib on disease-free survival in patients with stage 3 colon cancer, Meyerhardt and colleagues initiated a randomized clinical trial, the Alliance 80702 trial, in 2010. The trial enrolled 2,526 patients between 2010 and 2015. After treatment, patients were randomized to receive adjuvant chemotherapy with fluorouracil, leucovorin, and oxaliplatin (FOLFOX) for three or six months with or without daily celecoxib for three years. Those who took celecoxib exhibited some benefits, but the results, published in 2021, did not show statistical significance.

During the execution of that trial, new evidence suggested that anti-inflammatory drugs might benefit some patients with colon cancer, but not others. For instance, in 2012 Dana-Farber researchers observed a signal in the Nurse’s Health Study and Health Professionals Follow-up Study, a long-term observational study of a broad spectrum of individuals. Patients in the study with colon cancer who regularly used aspirin, also an anti-inflammatory with a similar mechanism of action to celecoxib, had longer survival, but only if they had PIK3CA-mutated colon cancer. Other observational studies conducted since then have supported this association.

We needed to do a subgroup analysis of the Alliance 80702 trial data to determine if PIK3CA mutations are a predictor of response to celecoxib.
Jonathan Nowak, first author, MD, PhD, a molecular and gastrointestinal pathologist at Brigham and Women’s Hospital and Dana-Farber and investigator in the Hale Family Center for Pancreatic Cancer Research at Dana-Farber
Researchers found that 22% of patients had tumors with PIK3CA mutations. The patients with PIK3CA-mutated tumors who received celecoxib lived significantly longer overall compared to patients without PIK3CA mutations who received celecoxib.

In this new study, Meyerhardt, Nowak, and colleagues performed comprehensive genetic sequencing called whole exome sequencing on 1200 tumor samples from patients from the Alliance 80702 trial. They found that 22% of patients had tumors with PIK3CA mutations. The patients with PIK3CA-mutated tumors who received celecoxib lived significantly longer overall compared to patients without PIK3CA mutations who received celecoxib.

Patients in the study with colon cancer who regularly used aspirin, also an anti-inflammatory with a similar mechanism of action to celecoxib, had longer survival, but only if they had PIK3CA-mutated colon cancer. (Representational Image: Unsplash)
Patients in the study with colon cancer who regularly used aspirin, also an anti-inflammatory with a similar mechanism of action to celecoxib, had longer survival, but only if they had PIK3CA-mutated colon cancer. (Representational Image: Unsplash)

In this analysis, a patient’s risk of dying was reduced by about 50%, and by about 60% when excluding patients who were using low-dose aspirin for reasons not related to their cancer treatment. Disease-free survival was also improved but did not reach statistical significance.

“If these results are confirmed in other ongoing studies, it will be important for physicians to understand the genetics within the tumors of patients with early-stage colon cancer to determine which patients may benefit from celecoxib in addition to other standard treatments,” says Meyerhardt.

Funding: The National Institutes of Health, the Alliance for Clinical Trials in Oncology Foundation, Karen Guo Colon Cancer Fund, Douglas Gray Woodruff Chair in Colorectal Research Fund, and the Stone Research Fund.

About Dana-Farber Cancer Institute 

Dana-Farber Cancer Institute is a leading center for cancer research and treatment worldwide. Dana-Farber’s mission is to reduce the burden of cancer through scientific inquiry, clinical care, education, community engagement, and advocacy. Dana-Farber is a federally designated Comprehensive Cancer Center and a teaching affiliate of Harvard Medical School.

(Newswise/TAB)

These findings are the first clinical trial results to validate previous observations that adjuvant anti-inflammatory prostaglandin inhibitors, such as celecoxib, improve survival for PIK3CA-mutated colon cancer. (Representational Image: Wikimedia Commons)
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