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Microbiome Drug Interactions in Cancer Pharmacology: Mechanisms and Therapeutic Opportunities

Arvind Kumar Patel1, Neha Singh2, Phool Chandra3

  • 1Narayan Institute of Pharmacy, Gopal Narayan Singh University, Jamuhar, Sasaram, Rohtas-821305, Bihar, India.

Current Reviews in Clinical and Experimental Pharmacology
|June 17, 2026
PubMed
Abstract

Insights

The gut microbiome significantly impacts cancer treatment effectiveness and side effects by altering drug metabolism and immune responses. Optimizing the microbiome holds promise for personalized cancer therapy, but requires further clinical validation.

Area of Science:

  • Oncology
  • Microbiology
  • Pharmacology

Background:

  • Interindividual variability in cancer therapy response is not fully explained by host genetics or tumor characteristics alone.
  • Emerging evidence highlights the gut microbiome's critical role in modulating anticancer drug metabolism, immune responses, and therapeutic outcomes.
  • The gut microbiome is an important determinant in cancer pharmacology.

Purpose of the Study:

  • To synthesize preclinical and clinical evidence on microbiome-drug interactions in cancer therapy.
  • To focus on pharmacokinetics, immune modulation, toxicity, and resistance across various cancer treatments.
  • To explore the gut microbiome's influence on chemotherapy, immunotherapy, and targeted therapies.

Main Methods:

  • A narrative review employing a structured literature search of PubMed, Scopus, and Web of Science databases.
  • Literature search conducted for articles published between 2005 and 2025.
  • Synthesis of evidence focusing on microbiome-drug interactions and their impact on cancer treatment.

Main Results:

  • The gut microbiome influences anticancer therapy via enzymatic biotransformation, immune regulation, metabolite signaling, and intestinal barrier integrity.
  • Favorable microbiome profiles correlate with improved immunotherapy outcomes (HR ~0.5-0.7), while antibiotic use reduces response rates by 20-40%.
  • Microbial enzymes (e.g., β-glucuronidase) contribute to irinotecan toxicity (20-40% of patients), and specific taxa (Akkermansia, Bifidobacterium) enhance therapeutic response.
  • Microbiome interventions like fecal microbiota transplantation show promise, restoring response in ~30-40% of refractory cases in early studies.

Conclusions:

  • The gut microbiome is an adaptable determinant of cancer pharmacology.
  • Integrating microbiome-informed strategies offers a promising avenue for precision oncology.
  • Robust clinical validation is essential for the routine implementation of microbiome-based strategies in cancer care.
Keywords:
Gut microbiomecancer pharmacologychemotherapydrug-microbiome interactionsimmunotherapyprecision oncology.targeted therapy

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