Hormonal
Tirzepatide reduces MC38 colon tumor growth rates in diet-induced obese mice by approximately 50%, but this effect is indirect and mediated by reduced food intake, lower insulin, and lower leptin levels rather than direct anti-proliferative action on cancer cells.
For obese individuals with early-stage, insulin-sensitive cancers (like colon cancer), tirzepatide may help slow tumor growth. This benefit appears to come from reducing insulin and leptin levels through weight loss and appetite suppression, not from directly attacking the cancer cells. It is not a cure, but it may improve outcomes by altering the metabolic environment that fuels cancer growth.
Tirzepatide did not cause tumor regression, but reduced tumor growth rates by ~ 50%. This was associated with substantial reductions in food intake, and in circulating levels of insulin and leptin. Tirzepatide had no effect on MC38 cancer cell proliferation in vitro, and the effect of tirzepatide on tumor growth in vivo could be phenocopied in placebo treated mice simply by restricting food intake to the amount consumed mice receiving the drug. This provides evidence that the drug acts indirectly to inhibit tumor growth.
Why this rating
In vivo murine model with a small sample size (n=6 per group) and pre-clinical status (preprint); strong mechanistic evidence but lacks human clinical data.
Source
Tirzepatide inhibits tumor growth in mice with diet-induced obesity
Linxuan Huang et al. · bioRxiv (Cold Spring Harbor Laboratory) · 2023
DOI 10.1101/2023.06.22.546093
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