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Gut microbiome and CAR-T therapy.

Muhammad Bilal Abid1,2, Nirav N Shah2, Theresa C Maatman3

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Manipulating gut microbiota may improve chimeric antigen receptor (CAR) T-cell therapy effectiveness in hematologic malignancies. This review explores how gut bacteria could enhance CAR T-cell responses and overcome resistance in cancer treatment.

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Area of Science:

  • Oncology
  • Immunology
  • Microbiome Research

Background:

  • Recent advancements in cancer therapeutics include targeted strategies like immunotherapy and chimeric antigen receptor (CAR) T-cells, primarily for hematologic malignancies (HM).
  • While CAR T-cell therapy shows promise, clinical response heterogeneity persists, necessitating strategies to improve efficacy.
  • The gut microbiome is recognized as a crucial host factor influencing immunotherapy response.

Purpose of the Study:

  • To investigate the potential role of gut microbiota in modulating anti-tumor responses to CAR T-cells in hematologic malignancies.
  • To hypothesize that strategic manipulation of gut microbiota can enhance CAR T-cell therapy outcomes.
  • To review resistance mechanisms to CAR T-cells and explore novel strategies, including harnessing the gut microbiome, to overcome them.

Main Methods:

  • This study is a review based on molecular and immunological understanding of CAR T-cell therapy and the gut microbiome.
  • It synthesizes existing research on immunotherapy response and gut microbiome diversity.
  • It discusses potential mechanisms and strategies for modulating the gut microbiota to improve CAR T-cell efficacy.

Main Results:

  • Human studies indicate that a more diverse gut microbiome is associated with superior response and survival in patients receiving immunotherapy.
  • The specific impact of gut microbiota on anti-tumor responses to CAR T-cells remains largely unknown.
  • The review posits a hypothesis that manipulating gut microbiota could enhance CAR T-cell efficacy.

Conclusions:

  • Gut microbiota represents a promising, yet understudied, factor for enhancing CAR T-cell therapy in hematologic malignancies.
  • Further research into microbiome modulation strategies is warranted to overcome CAR T-cell resistance and improve patient outcomes.
  • Harnessing the gut microbiome alongside other novel strategies may offer new avenues for effective cancer treatment.