TAPER: This study is evaluating the effectiveness of preventing cancer recurrence in people with endometrial cancer who have had prior surgery by using their tumour molecular status to determine whether they require further treatmentA Phase II Study of Tailored Adjuvant Therapy in POLE-Mutated and p53-Wildtype/NSMP Early Stage Endormetrial Cancer (RAINBO BLUE & TAPER)

Inclusion

• Patients must have had surgery consisting of hysterectomy and bilateral salpingo-oophorectomy. Lymph node dissection can be performed as per institutional standards. There must be no macroscopic residual disease after surgery.
• Patients must have histologically confirmed Stage I to III endometrial carcinoma which can be endometrioid, serous, clear cell, un/dedifferentiated, carcinosarcoma or mixed.
• Patients' Eastern Cooperative Group (ECOG) performance status must be 0, 1, or 2.
• HIV-infected patients on effective anti-retroviral therapy with undetectable viral load within 6 months are eligible for this trial.
• Patients' age must be ≥ 18 years.
• Patient consent must be appropriately obtained in accordance with applicable local and regulatory requirements.
• Patient is able (i.e. sufficiently fluent) and willing to complete the patient-reported outcomes (PRO) questionnaires in either English, French or a validated language
• Patients must be accessible for treatment and follow-up. Patients enrolled on this trial must be treated and followed at the participating centre
• Protocol treatment is to begin within 10 weeks of hysterectomy/bilateral salpingo-oophorectomy