Real-world quality of life (QoL) in black, indigenous and people of color (BIPOC) treated with palbociclib (PAL) and endocrine therapy for hormone receptor–positive (HR+)/human epidermal growth factor receptor 2–negative (HER2–) advanced breast cancer (ABC): A subgroup analysis from POLARIS.

1071 Background: Racial disparities in breast cancer incidence, mortality, and care are well documented. PAL plus endocrine therapy is indicated for patients (pts) with HR+/HER2− ABC. Findings from the PALOMA clinical trials have shown that pts receiving PAL maintained stable QoL; however, limited QoL data are available from real-world settings for BIPOC receiving PAL. Methods: POLARIS is a noninterventional, prospective, primarily US-based study in pts with HR+/HER2– ABC receiving PAL. QoL was assessed with the European Organisation for Research and Treatment of Cancer Quality-of-Life Questionnaire Core 30 (EORTC QLQ-C30) at baseline, monthly for the first 3 mo of treatment (Tx) with PAL, and then every 3 mo. In this interim analysis, we report Tx patterns and QoL assessments at baseline and at 6 mo and 12 mo in BIPOC from POLARIS. Results: Of 1280 pts treated with PAL as November 10, 2020, 233 were included in the BIPOC subgroup of whom 159 (68.2%) completed PAL Tx for ≥6 mo and 112 (48.1%) for ≥12 mo. In the BIPOC cohort, 59.2% of pts were black, 35.2% Hispanic, 3.4% American Indian or Alaskan native, 2.1% Pacific Islander. PAL in combination with letrozole/anastrozole was received by 116 pts, 94 received PAL plus fulvestrant, 13 received PAL plus exemestane, and 10 received PAL plus another Tx; 175 pts (75.1%) received PAL as first-line Tx. Mean EORTC QLQ-C30 global health QoL and functional scales scores remained stable over the first 12 mo of PAL Tx, without any changes at or above the 10-point threshold considered clinically meaningful, and were similar to those previously reported in an earlier analysis of the entire POLARIS population (Table and Rocque et al SABCS 2019). Symptom scales scores, including nausea and vomiting, pain, dyspnea, insomnia, appetite loss, constipation, and diarrhea, also remained stable over 12 mo. Conclusions: In this subgroup analysis, PAL had no significant adverse impact on QOL in BIPOC with HR+/HER2– ABC, consistent with previous findings from the total POLARIS study population. Pfizer (NCT03280303). Clinical trial information: NCT03280303 .[Table: see text]