Trial of Nab-Sirolimus in Combination With Letrozole in Patients With Advanced or Recurrent Endometrioid Endometrial Cancer

Inclusion Criteria

• •1. Patients must have clinically confirmed advanced or recurrent endometrioid endometrial carcinoma. Histologic documentation of the recurrence is suggested but not required.
• •2. All patients must have 1 or more measurable target lesion at baseline by computed tomography (CT; or magnetic resonance imaging \[MRI\] if CT scans are contraindicated) as defined by RECIST version 1.1.
• •3. Patients must have EEC that is metastatic or locally advanced where surgical resection is not an option or likely to result in severe morbidity.
• •4. Prior treatment history:
• •1. Adjuvant setting - treatment with chemotherapy, hormonal therapy,checkpoint inhibitors, and/or other therapy is permitted as long as theadjuvant therapy ended ≥6 months from enrollment.
• •2. Recurrent/advanced/metastatic setting - treatment with 0-1 prior chemotherapy regimens is permitted (patients may be naïve to chemotherapy); chemotherapy must have been completed ≥3 months prior to enrollment. Patients are permitted to have received adjuvant chemotherapy and no more than 1 line of chemotherapy in the recurrent/advanced/metastatic setting.
• •3. Non-chemotherapy-based treatment (eg, checkpoint inhibitors, hormonal therapy, and/or small molecule agents) is permitted at any point as long as therapy ended ≥4 weeks prior to enrollment.
• •4. Patients who have received prior therapy in the recurrent/advanced/metastatic setting must have achieved a complete or partial response(investigator-assessed) to at least 1 therapy.
• •5. Age: 18 years or older.
• •6. Patient must have Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
• •7. Adequate liver function:
• •1. Total bilirubin ≤1.5 × upper limit of normal (ULN) (unless due to Gilbert's syndrome, then ≤3 × ULN)
• •2. Aspartate aminotransferase (AST) ≤2.5 × ULN (≤5 × ULN if attributable to liver metastases)
• •8. Adequate renal function: creatinine clearance (CrCL) ≥30 mL/min based on Cockcroft-Gault
• •9. Adequate hematologic parameters:
• •1. Absolute neutrophil count (ANC) ≥1.0 × 109/L (growth factor support allowed)
• •2. Platelet count ≥100,000/mm3 (100 × 109/L) (transfusion and/or growth factor support allowed)
• •3. Hemoglobin ≥8.0 g/dL (transfusion and/or growth factor support allowed)
• •10. Fasting serum triglyceride must be ≤300 mg/dL; fasting serum cholesterol must be less than or equal to 350 mg/dL.
• •11. Minimum of 4 weeks since any major surgery, completion of radiation, or completion of prior systemic anticancer therapy, or at least 5 half-lives if the prior therapy is a single agent small-molecule therapeutic, and adequately recovered from the acute toxicities of any prior therapy, including neuropathy, to Grade ≤1.
• •12. Non-pregnant and non-breastfeeding female:
• •1. Females of childbearing potential must agree to use effective contraception or abstinence without interruption from 28 days prior to starting nab-Sirolimus through 3 months after the last dose of nab-Sirolimus and have a negative serum pregnancy test (beta human chorionic gonadotropin \[β-hCG\]) result at screening and agree to ongoing pregnancy testing during the course of the study, and after the end of study treatment. A second form of birth control is required even if she has had a tubal ligation.
• •2. Sexual abstinence is considered a highly effective contraceptive method only if defined as refraining from heterosexual intercourse from 28 days prior to starting study medication throughout 3 months after last dose of study medication. The reliability of sexual abstinence should be evaluated in relation to the duration of the study and the preferred and usual lifestyle of the patient.
• •13. The patient understands and signs the informed consent.
• •14. Willingness and ability to comply with scheduled visits, laboratory tests, and other study procedures.
• •1. There has been no acquired immunodeficiency syndrome (AIDS)-defining opportunistic infection in 12 months prior to enrollment.
• •2. The patient has been receiving an antiretroviral therapy regimen for≥4 weeks and the HIV viral load is \<400 copies/mL prior to enrollment.
• •3. Antiretroviral therapy regimen does not include strong cytochrome(CYP)3A4 inhibitors or inducers