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• ‘Multiomic’ analysis suggests ways to strengthen antitumor response
• Hopeful new lead for making inroads against deadliest gynecologic cancer
• Findings published in Nature Communications

Newswise — BUFFALO, N.Y. — A study led by Roswell Park Comprehensive Cancer Center provides new insight into the complex interactions of the “tumor-immune-gut axis,” and its role in influencing immunotherapy responses in patients with recurrent ovarian cancer. in Nature Communications, the findings emphasize the role of the patient’s microbiome — the collection of microorganisms in the body —and lay the groundwork for future clinical trials aimed at improving treatment outcomes.

That goal is critical, because epithelial ovarian cancer, fallopian tube cancer and primary peritoneal cancer — all categorized under the umbrella of ovarian cancer — are the deadliest gynecological malignancies, with a five-year survival rate of less than 50%. Most deaths occur as a result of disease that is refractory, or resistant to treatment. Patients who have recurrent ovarian cancer — especially those whose disease is resistant to platinum-based chemotherapy, the standard-of-care treatment — currently have no curative treatment options.

The study’s senior author, , Chair of Gynecologic Oncology and the Shashi Lele, MD, Endowed Chair in Gynecologic Oncology at Roswell Park, served as Principal Investigator for the that provided the rationale for the new work.

The clinical trial enrolled 40 patients with recurrent ovarian cancer and demonstrated that a combination of the immunotherapy pembrolizumab (Keytruda), the targeted drug bevacizumab (Avastin), and the chemotherapy cyclophosphamide (Cytoxan) achieved significant outcomes:

• 95% of patients experienced a complete or partial response or stable disease.
• Time to disease progression was significantly extended.
• Patients maintained a high quality of life.

Based on these results, the National Comprehensive Cancer Network (NCCN) revised its ovarian cancer guidelines to recommend the combination as a second-line therapy for the treatment of recurrent ovarian cancer that does not respond to platinum-based treatments.

Dr. Zsiros and her colleagues took the results a step further in the current study to determine why some of the clinical trial participants achieved an extended clinical benefit while others experienced a limited benefit. Using biological samples collected previously from patients in both groups — including blood, stool and tumor tissue — they performed molecular, immune, microbiome and metabolic profiling to provide a clearer picture of various biological processes before and after therapy.

That multiomic analysis showed a post-treatment increase in the number of cancer-fighting T and B immune cells. In patients who experienced exceptional clinical responses, it also revealed patterns suggesting how the patients’ microbiomes interacted with amino acid and lipid metabolism, which are associated with the rapid growth of cancer cells and the formation of tumors. The team identified specific bacterial species that were present before and after treatment in patients who responded well to therapy. That information suggests that it might be possible to strengthen the immune response to therapy by altering the microbiome with probiotics, antibiotics or fecal transplants.

The team also identified the CD40 protein as a potential target for triggering immune responses against ovarian cancer. Building on this discovery, Dr. Zsiros is leading a new evaluating the addition of a CD40-targeting therapy to the pembrolizumab and bevacizumab combination to treat patients with recurrent ovarian cancer.

Co-first authors of the study are , Assistant Professor of Oncology, Department of Biostatistics and Bioinformatics, and Director of the Bioanalytics, Metabolomics & Pharmacokinetics (BMPK) Shared Resource at Roswell Park and , Assistant Professor of Oncology, Department of Biostatistics and Bioinformatics, and

“These findings bring us closer to making meaningful advances for women battling recurrent ovarian cancer,” says Dr. Zsiros. “They not only enhance our understanding of the tumor-immune-gut axis but also open up exciting possibilities for new therapeutic strategies.”

In addition to Roswell Park, the research team includes contributors from the University of Chicago Comprehensive Cancer Center and The University of Texas MD Anderson Cancer Center.

This work was supported by several National Institutes of Health (NIH) grants, including grant P30CA016056, Roswell Park’s Core Grant from the National Cancer Institute, as well as S10OD024973, U24CA232979, R25CA203650 and R50CA283805. Work reflected in this grant was also supported by the Roswell Park Alliance Foundation and a grant from Merck & Co. Inc.

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From the world’s first chemotherapy research to the PSA prostate cancer biomarker, Roswell Park Comprehensive Cancer Center generates innovations that shape how cancer is detected, treated and prevented worldwide. Driven to eliminate cancer’s grip on humanity, the Roswell Park team of 4,000 makes compassionate, patient-centered cancer care and services accessible across New York State and beyond. Founded in 1898, Roswell Park was among the first three cancer centers nationwide to become a National Cancer Institute-designated comprehensive cancer center and is the only one to hold this designation in Upstate New York. To learn more about and the , visit , call 1-800-ROSWELL (1-800-767-9355) or email [email protected].