Letter: Estimating the baseline local recurrence rate for a brain metastasis after neurosurgical resection.

Brain metastases represent a growing healthcare challenge with a rising incidence attributed to earlier detection and improved systemic cancer treatments. We conducted a systematic review and meta-analysis to investigate the local recurrence rate following surgical resection of a brain metastasis without adjuvant therapy. The analysis included four studies with a total of 235 cases. It was found that the rate of local recurrence by 12-months was 48.1% (95% CI 41.2-58.9). These findings underscore the high rate of patients who will experience local recurrence within 12-months of surgery, emphasising the need for vigilant surveillance when omitting adjuvant radiotherapy in favour of systemic treatments with potential but unproven CNS penetrance. The analysis highlights unmet needs in this patient population.