RWE About QOL and Compliance of Patients With OFS in China

This was a real world, observational study of adjuvant therapy with GnRHa for OFS in postoperative, premenopausal women with endocrine responsive breast cancer. This trial is designed to compare patients' QOL and treatment compliance measured by FACT-B and self-administered questionnaires during OFS treatment period. Total score of FACT-B and self-administered questionaries, and change from baseline will be calculated and summarized descriptively. Change from baseline will be compared between GnRHa 3-month and GnRHa 1-month using ANCOVA model with baseline value as a covariate.The number depends on the patients who received questionnaire during 18 months recruitment in planned 10 sites. This analytical plan assumes homogeneity across 10 sites so that strata is not considered.

Inclusion criteria

Age≥18 years old; Both or either ER+ or PgR+ primary tumor; T1-T3, any N, and M0 according to the TNM classification; Any type of breast surgery (includes breast conserving surgery and breast cancer radical surgery); Any type of preoperative and/or postoperative adjuvant chemotherapy prior to enrollment; History of regular menstruation and not having chemical menopause (FSH≥40 mIU/mL and E2<10 pg/mL) within 12 weeks after completion of the postoperative chemotherapy; Previously using GnRH-a 1M or 3M as OFS treatment for at least one time; Capable of receiving other study drug like Tamoxifen or AI; Eastern Cooperative Oncology Group performance status of Grade 0 or 1.

Exclusion criteria

Uncapable of receiving endocrine therapy for any clinical or other reason; Bilateral oophorectomy or ovarian irradiation Inflammatory breast cancer or bilateral breast cancer; Multiple cancers or a history of cancer in other organs; Patients with other non-malignant systemic diseases (cardiovascular, renal, hepatic, lung, etc.) that would prevent prolonged follow-up.