Maintenance of patient-reported quality of life (EQ-5D-3L) post neoadjuvant relugolix prior to the initiation of prostate radiation therapy.

Abstract

117 Background: Injectable GnRH receptor agonists have been shown to improve cancer control when combined with radiotherapy (RT) for unfavorable intermediate- to high-risk prostate cancer. Relugolix is a new oral GnRH receptor antagonist that achieves high rates of rapid profound castration (total testosterone < 20 ng/dL), which may impact health-related quality of life. This prospective study sought to evaluate the impact of neoadjuvant relugolix on health-related quality of life in prostate cancer patients prior to the start of prostate RT. Methods: Patients treated at Georgetown between May 2021 and August 2023 with neoadjuvant relugolix (at least 2 months prior to RT) per an institutional protocol were included in the study (IRB 12-1775). The 5-item EQ-5D-3L, a validated questionnaire that assesses the patient-reported health status outcome, was collected for each patient at baseline (before relugolix initiation) and one hour prior to RT initiation. EQ VAS Score Overall ranges from 0-100 with a higher score indicating better quality of life. Individual items including mobility, self-care, usual activities, pain/discomfort, and anxiety/depression were scored on a three-point scale from 1 (No problems) to 3 (Extreme). To examine changes before and after relugolix treatment, McNemar’s test and paired samples t-test were used. Minimally important difference (MID) calculated by 0.5 of standard deviation at baseline was used to examine clinical significance. Results: Of 79 patients, the median age was 73 years, and 42% were non-white. Patients initiated relugolix at a median of 4 months prior to questionnaire administration (IQR: 3.9-5.4), at which most (95%) patients achieved castration (≤ 50 ng/dL). The VAS Score Overall was significantly higher at baseline (Mean ± SD: 83 ± 10) than the paired score at the start of RT (80 ± 14, p = 0.01). This change was not clinically significant. There were no statistically or clinically significant differences in any of the 5 individual items. Conclusions: Neoadjuvant relugolix prior to prostate radiation therapy did not clinically significantly affect patient-reported quality of life. Also, there was no statistically significant decrease in each of the 5 individualized items evaluating health-related quality of life. Future studies should focus on comparing it to GnRH agonist-induced change in quality of life. [Table: see text]