GnRHa + Letrozole in Obese Progestin-insensitive Endometrial Cancer Patients

Xiaojun Chen

Status and phase: Enrolling; Phase 3; Phase 2

Conditions: Progesterone Resistance; Obesity; Atypical Endometrial Hyperplasia; Endometrial Neoplasms

Treatments: Drug: Letrozole 2.5mg; Drug: GnRH antagonist

Study type: Interventional

Funder types: Other

Identifiers

NCT06379113

53211030-2

Details and patient eligibility

About

To investigate the efficacy of GnRHa plus letrozole in obese progestin-insensitive EEC patients.

Full description

There were more and more women with early endometrioid endometrial cancer (EEC) and atypical endometrial hyperplasia (EAH) who want to preserve fertility.

Approximately 70% to 80% of females who meet the criteria for conservation treatment are able to achieve CR after progestin therapy, with a median time of 6-7 months, but about 20% to 30% of patients get no response or need to take longer time to achieve remission (over one year). With long duration of treatment, there will be more side effects such as weight gain, impaired liver function, endometrial injury, ovarian reserve inhibition etc. which will decrease the efficacy of conservative treatment. Previous researches had shown that GnRHa plus letrozole could be a better second-line treatment for obese progestin-insensitive patients. Till now, no similar studies were found, so we design this study to explore the efficacy of GnRHa plus letrozole in obese progestin-insensitive EEC and EAH patients to provide new evidences for improving conservative treatment efficacy. We defined obese patients as these with BMI ≥ 30kg/m2.

This will be a single-centred prospective pilot study. Patients diagnosed as obese progestin-insensitive EEC by dilatation and curettage (D&C) or hysteroscopy will be enrolled. The primary endpoint is cumulative complete response (CR) rate at 28 weeks of treatment. The secondary endpoints include adverse events, duration of complete response, recurrent rate, pregnancy rate and quality of life of patients.

Enrollment: 29 estimated patients

Sex: Female

Ages: 18 to 45 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Have a confirmed initial pathological diagnosis based upon hysteroscopy: histologically prove well-differentiated EEC G1 without myometrial invasion

• BMI≥30kg/m2

• No signs of suspicious extrauterine involvement on enhanced magnetic resonance imaging (MRI) or enhanced computed tomography (CT) or ultrasound

• Using progestin, any of the following therapy, as first-line treatment:

  1. Megestrol acetate ≥ 160 mg qd using, combined with Levonorgestrel Lntrauterine System (LNG-IUS) inserted or not
  2. Medroxyprogesterone acetate ≥ 250 mg qd using, combined with LNG-IUS inserted or not
  3. LNG-IUS inserted

• Progestin-insensitive:

  1. remained with stable disease after 7 months of progestin use
  2. did not achieve CR after 10 months of progestin use

• Have a desire for remaining reproductive function or uterus

• Good compliance with adjunctive treatment and follow-up

Exclusion criteria

• Combined with severe medical disease or severely impaired liver and kidney function
• Pathologically confirmed as endometrial cancer with suspicious myometrial invasion or extrauterine metastasis
• Patients with other types of endometrial cancer or other malignant tumors of the reproductive system
• Patients with breast cancer or other hormone- dependent tumors or diseases that cannot be used with GnRHa or Letrozole
• Strong request for uterine removal or other conservative treatment
• Known or suspected pregnancy
• Acute severe disease such as stroke or heart infarction or a history of thrombosis disease
• Smoker(>15 cigarettes a day)

Trial design

Primary purpose: Treatment

Allocation: N/A

Interventional model: Single Group Assignment

Masking: None (Open label)

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29 participants in 1 patient group

Obese EEC group

Experimental group

Description:

This group including 29 EEC cases. Interventional Study Model was Simon two-stage optimal design. Eleven patients were needed for the first stage, and if eight or more patients achieved CR at 28 weeks, the trial can enter into the second stage. Then every 12 to 16 weeks, an hysteroscope will be used to evaluate the endometrial condition, and the pathological findings will be recorded.

Treatment:

Drug: GnRH antagonist

Drug: Letrozole 2.5mg