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RecruitingLast updated: 14 May 2026

TAPER: Using a molecular test to determine whether post-surgery treatment can be safely skipped in people with early-stage endometrial cancersA Phase II Study of Tailored Adjuvant Therapy in POLE-Mutated and p53-Wildtype/NSMP Early Stage Endormetrial Cancer (RAINBO BLUE & TAPER)

Trial purpose

Medical clipboardCancer treatment

Tumor type

Female Reproductive System Cancers Gynaecological

Age

People18+

Trial acronym

TAPER

Clinical summary

Summary

THis study is being done in order to find out if this new approach is better or worse than the usual approach for early-stage endometrial cancer. The usual approach is defined as the care most people get for early-stage endometrial cancer.

The usual approach for patients who are not in a study is treatment with surgery. Tissue that is removed as part of this procedure is analysed in the pathology laboratory to guide the doctor to decide whether or not additional treatment, such as radiation or chemotherapy, should be recommended.

You may be eligible for this study if you have:

  • stage I to III endometrial carcinoma, which can be endometrioid, serous, clear cell, un-dedifferentiated, carcinosarcoma, or mixed.
  • had surgery involving hysterectomy and bilateral salpingo-oophorectomy.

Conditions

This trial is treating people with endometrial cancer that has been surgically removed

Eligibility

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

Exclusion

  • Prior Neoadjuvant chemotherapy for current endometrial cancer diagnosis.
  • Prior pelvic radiation.
  • Patients with a history of other malignancies, except: carcinoma in-situ without evidence of invasive disease when resected, adequately treated non-melanoma skin cancer, or other tumours curatively treated with no evidence of disease for ≥ 5 years.
  • Clinical evidence of distant metastasis as determined by pre-surgical or post-surgical imaging (CT scan of chest, abdomen and pelvis or whole-body PET-CT scan)
  • Patients with a documented positive surgical margin.
  • Patients with a documented positive peritoneal washings, if performed.

Inclusion

  • You have had a certain type of treatment or surgical procedure.
  • You have the type of cancer, symptoms, or health risks that this clinical trial is focused on.

Exclusion

  • You have been diagnosed with a prior or secondary type of cancer.
  • You have had certain treatments, surgical procedures or drugs.
Message

Clinical trials have complex eligibility criteria, and other criteria may apply for this trial. Ask your doctor about whether this trial could be right for you.

Participating hospitals

Recruiting hospitals

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More information

Trial Identifiers

Information on this page is partially produced from ClinicalTrials.gov *. View further details about this trial on the registry via the links below:

Trial sponsor

Canadian Cancer Trials Group

Scientific Title

A Phase II Study of Tailored Adjuvant Therapy in POLE-Mutated and p53-Wildtype/NSMP Early Stage Endormetrial Cancer (RAINBO BLUE & TAPER)

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