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    Antibiotics may negatively impact immunotherapy outcomes

    Administration of broad-spectrum antibiotics in patients with metastatic renal cell carcinoma (RCC) undergoing treatment with immune checkpoint inhibitors may have a negative effect on the efficacy of the immunotherapy drugs, according to the results of a retrospective analysis presented at a press conference ahead of the Genitourinary Cancers Symposium in Orlando, FL.

    Also see: PD-1 inhibitor benefit possible even after discontinuation

    “This is the first analysis evaluating the impact of broad spectrum antibiotics on outcomes in metastatic renal cell carcinoma patients treated in the era of immune checkpoint inhibitors,” study co-author Lisa Derosa, MD, of the Gustave Roussy Cancer Institute, Paris-Sud, University in Villejuif, France, said during the press conference. “Recent use of broad spectrum antibiotics prior to immune checkpoint inhibitors negatively influences outcomes even after adjustment for prognostic risk factors.”

    It is known that the use of antibiotics alters the gut microbiota composition and decreases bacterial diversity within the body. According to Dr. Derosa, new evidence found in animal studies suggested an interrelationship between broad spectrum antibiotics and immune checkpoint blockade in terms of efficacy.

    With this study, Dr. Derosa and co-authors sought to evaluate whether antibiotics affected the efficacy of immune checkpoint blockade used in the treatment of metastatic RCC. The authors enrolled 80 patients who were treated with anti-PD-1/PD-L1 monotherapy or combination treatments. Patients were classified as being antibiotics positive (20%; antibiotics up to 1 months prior to first treatment) or antibiotics negative.

    Next: Patients who received antibiotics had significantly decreased PFS compared with patients who were antibiotics negative

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