Abstract PO3-05-11: Enhancing the interpretation of real-world quality of life (QoL) in patients (pts) with hormone receptor positive human epidermal growth factor 2 negative (HR+/HER2−) advanced breast cancer (ABC) enrolled in the POLARIS trial

Abstract Background POLARIS is a prospective, observational real-world study of pts with HR+/HER2− ABC receiving palbociclib in routine clinical practice. We have previously shown that palbociclib treatment did not have any significant adverse impact on pt QoL when assessed by the EORTC-QLQ-C30 questionnaire,1 consistent with published clinical trial findings. Now, to enhance interpretation, we sought to characterize EORTC scores (using updated POLARIS data) into terms that are meaningful to pts, physicians, and other stakeholders, using a similar approach to established clinical problem threshold methodology.2 Methods EORTC data were collected at baseline (BL), monthly for the first 3 months, and every 3 months thereafter until palbociclib discontinuation. Response options for each EORTC question (ordinal scale from 1=very poor to 7=excellent) were grouped into “favorable” (taking a conservative approach of using only responses 5, 6 or 7) and “less favorable” (response of ≤4) for the two items on global health status/QoL. The proportion of pts with favorable or less favorable response was compared between subgroups (line of therapy, age, race, bone metastases, visceral metastases, and dose modification) at timepoints BL, month 6, 12, and 18 using Fisher’s exact test. Results Between January 2017 and December 2018, 1285 pts were enrolled, of whom 1250 received at least one dose of palbociclib and subsequently analyzed as part of the final data cut of 09 Jan 2023. EORTC Q29 ‒ Overall Health completion rates were 1167/1250 (93.4%) at baseline, 732/1250 (58.6%) at month 6, 484/1250 (38.7%) at month 12, and 353/1250 (28.2%) at month 18 (Table). The proportion of pts with a favorable response for EORTC Q29 was consistently higher than with a not favorable response (BL, 56.1% vs 43.9%; month 6, 69.3% vs 30.7%; month 12, 68.6% vs 31.4%; and month 18, 70.0% vs 30.0%; Table). When analyzed by subgroup, no significant differences were observed in the proportion of pts with a favorable (to less favorable) response for any subgroup covariate, except for age at BL; however, this significance was not observed at month 6, 12 or 18 (Table). Similar results were observed for EORTC Q30 – Overall QoL (data not shown). Conclusions The proportion of pts indicating a favorable response in the EORTC questionnaire Overall Health and Overall QoL questions increased or were maintained in pts with HR+/HER2− ABC treated with palbociclib from BL through to month 18 across overall and all subgroups. It is important to note that these data are conditional on the pts who responded to the questions, whose numbers diminished over time. XX XX Citation Format: Gabrielle Rocque, Joanne Blum, Yan Ji, Timothy Pluard, John Migas, Shailendra Lakhanpal, Erin Jepsen, Eric Gauthier, Yao Wang, Monica Montelongo, Joseph C. Cappelleri, Connie Chen, Meghan Karuturi, Debu Tripathy. Enhancing the interpretation of real-world quality of life (QoL) in patients (pts) with hormone receptor positive human epidermal growth factor 2 negative (HR+/HER2−) advanced breast cancer (ABC) enrolled in the POLARIS trial [abstract]. In: Proceedings of the 2023 San Antonio Breast Cancer Symposium; 2023 Dec 5-9; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2024;84(9 Suppl):Abstract nr PO3-05-11.