A real example: what you get

30 papers in 5 themes · “Gut Microbiome and Checkpoint Inhibitor Response”.

  • A synthesis, each sentence with its papers
  • 5 themes with their findings
  • 2 points of consensus
  • 3 open questions
  • Each statement with the quoted sentence of its paper
The synthesis

The papers support a relationship between gut microbiome composition and response to immune checkpoint inhibitors (ICIs), but human evidence is predominantly observational and does not establish a universally causal or clinically predictive microbial signature.

A point of consensus, with its source

The microbiome–response association is credible, but a simple universal species-based biomarker is not supported by the cross-cohort evidence.

Its source A machine learning analysis confirmed the link between the microbiome and overall response rates (ORRs) and progression-free survival (PFS) with ICIs but also revealed limited reproducibility of microbiome-based signatures across cohorts. — Cross-cohort gut microbiome associations with immune checkpoint inhibitor response in advanced melanoma
An open question

Whether greater microbial diversity is independently beneficial remains unresolved; positive cohort findings should not be generalized into a universal rule.

The first results

  1. Gut microbiome modulates efficacy of immune checkpoint inhibitors Ming Yi, Shengnan Yu, Shuang Qin, Qian Liu et al. · 2018 Reviews evidence and mechanisms connecting gut microbiome composition with checkpoint inhibitor efficacy.
  2. Microbiota and cancer immunotherapy: in search of microbial signals Raad Z. Gharaibeh, Christian Jobin · 2018 Discusses microbial features and therapeutic approaches relevant to cancer immunotherapy.
  3. The Influence of the Gut Microbiome on Cancer, Immunity, and Cancer Immunotherapy Vancheswaran Gopalakrishnan, Beth Ann Helmink, Christine N. Spencer, Alexandre Reuben et al. · 2018 Provides broad context on microbiome effects on cancer immunity and treatment response.
  4. The microbiome in cancer immunotherapy: Diagnostic tools and therapeutic strategies Laurence Zitvogel, Yuting Ma, Didier Raoult, Guido Kroemer et al. · 2018 Discusses microbiome diagnostics and interventions, including evidence that antibiotics can impair checkpoint immunotherapy.
  5. Gut microbiome and cancer immunotherapy Weina Li, Yu Deng, Qian Chu, Peng Zhang · 2019 Discusses evidence that the gut microbiome affects cancer immunotherapy efficacy, especially checkpoint inhibitors.
  6. The Diversity of Gut Microbiome is Associated With Favorable Responses to Anti–Programmed Death 1 Immunotherapy in Chinese Patients With NSCLC Yueping Jin, Hui Dong, Liliang Xia, Yi Yang et al. · 2019 Tests associations between gut microbiome diversity and anti-PD-1 outcomes in Chinese NSCLC patients.
  7. The gut microbiome and response to immune checkpoint inhibitors: preclinical and clinical strategies Jun Gong, Alex Chehrazi‐Raffle, Veronica Placencio-Hickok, Michelle Guan et al. · 2019 Reviews evidence linking gut microbiome composition with checkpoint inhibitor efficacy and discusses unresolved issues.
  8. The role of the gut microbiome on the efficacy of immune checkpoint inhibitors in Japanese responder patients with advanced non-small cell lung cancer Yuki Katayama, Tadaaki Yamada, Takayuki Shimamoto, Masahiro Iwasaku et al. · 2019 Associates gut bacterial profiles with ICI response in Japanese patients with advanced NSCLC.
  9. Association of Short-Chain Fatty Acids in the Gut Microbiome With Clinical Response to Treatment With Nivolumab or Pembrolizumab in Patients With Solid Cancer Tumors Motoo Nomura, Ryosuke Nagatomo, Keitaro Doi, Juko Shimizu et al. · 2020 Measures fecal and plasma short-chain fatty acids in patients receiving PD-1 inhibitors.
  10. Gut Microbiome as a Potential Factor for Modulating Resistance to Cancer Immunotherapy Lin Shui, Xi Yang, Jian Li, Yi Cheng et al. · 2020 Examines how gut microbiota may influence resistance to checkpoint-targeted cancer immunotherapy.

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