Weight-loss Drug for Fertility-Sparing Treatment of Atypical Hyperplasia and Low-grade Cancer of the Endometrium

The research aims to answer the question: "Does the addition of a Glucose-dependent Insulinotropic Polypeptide (GIP)/Glucagon-like Peptide-1 (GLP-1) co-agonist to standard progestin treatment lead to a higher complete response rate compared to historical response rates using progestin alone in young patients with endometrial cancer/atypical hyperplasia who wish to preserve their fertility?".

This is a multicentre single arm open-label phase II clinical trial to assess the complete pathologic response as determined by endometrial sampling after 48 weeks of tirzepatide (GIP/GLP-1 co-agonist) and progestin therapy in patients with BMI ≥ 27 who have endometrial cancer/atypical hyperplasia and desire fertility preservation.

Inclusion criteria

• BMI ≥ 27
• Diagnosis of grade 1 or 2 endometrioid endometrial cancer or atypical hyperplasia made by either endometrial biopsy or dilation and curettage
• For those with endometrial cancer, clinical FIGO 2009 stage 1A disease without evidence of metastatic disease beyond the uterus and no myometrial invasion by MRI or CT
• ECOG status <2
• Desire for fertility preservation
• Ability to understand and willing to sign a written informed consent document

Exclusion criteria

• Evidence of myometrial invasion or extra-uterine disease on imaging
• High grade or p53 mutated (p53mut) endometrial cancer
• Estrogen receptor negative endometrial cancer (positivity defined as moderate/strong staining>10%)
• Mismatch repair deficient (MMRd) endometrial cancer
• History of other malignancies except if curatively treated with no evidence of disease for >5 years
• Previous surgical treatment of obesity
• Current use of weight loss medication (no use in last 2 months)
• Medical co-morbidity with end-organ dysfunction
• Contraindications to pIUD or tirzepatide.
• Any other condition that would, in the Investigator's judgment, contraindicate the patient's participation in the clinical study due to safety concerns or compliance with clinical study procedures.