Tirzepatide in Obesity-Driven Endometrial Cancer

LCCC2415 examines the antiproliferative effect of tirzepatide on the endometrium of endometrial cancer (EC). This is a pre-operative window clinical study. Endometrial biopsy samples from patients before tirzepatide treatment will be compared to their post-intervention hysterectomy specimens. If archival tissue is unavailable, a fresh biopsy will be taken before tirzepatide treatment. Post-intervention tissue will be collected from the hysterectomy specimen. The hypothesis is that tirzepatide's anti-tumorigenic effects are due to both an improvement in the host's metabolic milieu (indirect effect) and a direct effect on the EC tumor microenvironment via the inter-related pathways of insulin, lipid, and mTOR signaling. Therefore, tirzepatide may be an innovative approach to effectively induce weight loss and inhibit tumor growth in EC, the most obesity-driven of all cancers.

Inclusion Criteria: * Current diagnosis of endometrioid histology cancer and scheduled to undergo hysterectomy and staging. * Agree to comply with all required study assessments and visits including internet capabilities. * Written informed consent obtained to participate in the study and HIPAA authorization for release of personal health information. * Age ≥ 18 at the time of consent. * Body mass index of ≥30 kg/m2. * Presumed clinically early-stage disease (disease confined to uterus only). * ECOG ≤ 2 or Karnofsky Performance Status of \> 50 Exclusion Criteria: * Active infection requiring systemic therapy. * Subject is pregnant or breast feeding. * Taking any prescription medications or other drugs that may influence metabolism per discretion of investigator. * Taking a central nervous system stimulant. * Current psychological conditions that would be incompatible with participation in this study, as determined by investigator. * Known sensitivities (i.e., urticaria and eczema) to GIP and GLP-1 receptor agonists. * Have type 1 diabetes mellitus or latent autoimmune diabetes in adults or receiving treatment with insulin. * Have a history of severe hypoglycemia or not be able to communicate an understanding of hypoglycemic symptoms.