ArticleAdvances in radiation oncology2025
Local Therapy for Isolated Central Nervous System Progression Among Patients Receiving Antibody-Drug Conjugate Therapy.
Article in Advances in radiation oncology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Purpose: Antibody drug conjugates (ADCs) are an increasingly important class of therapeutics among patients with breast, lung, urothelial, and other malignancies. Guidelines recommend local therapy and continuation of current systemic therapy among patients with isolated brain relapse. We describe the clinical outcomes of this approach among patients receiving ADCs. Methods and Materials: We queried our institutional database for patients receiving radiation therapy (RT) in the setting of isolated brain progression on ADCs with a plan to continue same-line therapy after radiation. Patients with ≤3 brain metastases at the time of recurrence were categorized as oligoprogressive. Study endpoints included overall survival, progression-free survival (PFS), and the cumulative incidence of next therapy from the start of local therapy. Results: We identified 17 patients receiving ADC therapy with isolated brain progression treated with radiation (stereotactic radiosurgery [SRS]: n = 13, whole brain radiation: n = 4). All patients received concurrent ADC and RT. The median follow-up from local therapy was 29.5 months (95% CI, 21.4-not reached). The median overall survival was 19 months (95% CI, 16-not reached), and the median PFS was 8.1 months (range, 6.7-19 months). One lesion treated with SRS had local failure 21 months after treatment, and the 24-month cumulative incidence of local failure across the entire cohort was 1.6% (95% CI, 0.13%-7.7%). The 6-month cumulative incidence of radiation necrosis was 12% (95% CI, 1.8%-32%). The cumulative incidence of next therapy at 6 and 12 months was 47% (95% CI, 22%-69%) and 71% (95% CI, 41%-87%), respectively, and was significantly lower among patients with oligoprogressive brain recurrence. After SRS, 2 patients were without evidence of disease, discontinued systemic therapy, and were stable on observation at last follow-up. Conclusions: To the best of our knowledge, this is the first clinical report of outcomes using the guideline-recommended approach of local therapy for isolated brain relapse among patients receiving ADCs. Local therapy may delay the need for next line systemic therapy, particularly among patients with oligoprogressive brain relapse.
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