EFFECT OF ABIRATERONE ACETATE DOSE ON THE RESULTS OF TREATMENT WITH METASTATIC CASTRATION-RESISTANT PROSTATE CANCER PATIENTS

Anh Tú Đỗ, Đình Lợi Nguyễn

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Abstract

Objective: Evaluating the effect of Abiraterone acetate dose on treatment outcomes in patients with castration-resistant metastatic prostate cancer. Patients and methods: A cross-sectional descriptive study on 65 patients with metastatic castration-resistant prostate cancer in Vietnam National Cancer Hospital from January 2014 through May 2023. Kaplan-Meier curves were used to estimate the time to treatment failure (TTF). Results: Abiraterone acetate doses of 1000mg/day and 500mg/day were prescribed for most patients (47,7% and 38,5%). The median time to treatment failure was 15.0 months (95% CI: 11,1-18,9). The group of patients starting treatment with Abiraterone acetate 1000mg/day had a higher median TTF than those starting treatment with 250-750mg/day (17,0 months vs 11,0 months, p=0.112). The median TTF of the 250-500mg maintenance treatment group was significantly higher than that of the 1000mg/day maintenance treatment group (19,8 months vs 8,7 months, p=0.007). Conclusion: In patients with PSA reduced by over 90% compared to before treatment, maintenance treatment of Abiraterone acetate 250-500mg/day gives good results.

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