Variation in bone health management in older women with breast cancer: A secondary analysis of the Age Gap study.

INTRODUCTION

Physiological age-related bone loss is common, with 50% of women aged ≥80 having osteoporosis. Bone loss is exacerbated in women receiving aromatase inhibitors (AIs) for early breast cancer (EBC), increasing fracture risk. This study explored the management of bone-health in older women (≥70 years) with EBC and factors influencing clinical decision-making.

MATERIALS AND

METHODS

This was a sub-study of a larger United Kingdom multicentre observational study into practice variation and outcomes in older women (≥70) with EBC (Age Gap study). Participants were aged ≥70 years with EBC; data were collected on health status, treatments, and outcomes. This sub-study focused on patients recruited at five hospitals, where more detailed data on bone health and management were collected for women with ER + ve (oestrogen receptor positive) cancers who received adjuvant or primary endocrine therapy treatment. We aimed to determine factors influencing treatment selection and outcomes in this age group.

RESULTS

The main Age Gap study recruited between 2013 and 2018. In this sub-study, 565 patients had ER + ve cancers, of whom 529 (93.6%) received AIs and 26 (4.6%) tamoxifen. The median age of participants was 77 years (70-98 years). A baseline dual energy x-ray absorptiometry (DEXA) scan was performed in only 354/529 (67%) of the AI group. Bisphosphonates were prescribed for 226/529 (43%). Baseline DEXA scans were more likely to be requested if patients were fit for surgery and were < 80 years old. Of those scanned (n = 354), 148 (42%) were osteopenic and 64 (18%) osteoporotic. Bisphosphonate prescription was associated with younger age (<80 years old) (p = 0.02). From recruitment to 2022, fractures were diagnosed in 23% of participants (122/529), of whom only 38% (46/122) had received prior bisphosphonates. Frailty or prefrailty (Rockwood scale) were present in 94% (431/461), but there was no correlation between frailty and baseline hip (r2 = 0.0098) or spine (r2 = 0.00007) T-scores. Rates of DEXA scanning varied between centres from 36% to 76% (p < 0.001) for unknown reasons.

DISCUSSION: Age and general health influenced bone-health management decision-making, but there was considerable variation between centres, highlighting the need for standardised bone-health care for older women with EBC.