4.7 Article

Timing of Adjuvant Immunotherapy in Stage III Melanoma, Does it Matter?

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ANNALS OF SURGICAL ONCOLOGY
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SPRINGER
DOI: 10.1245/s10434-023-13935-0

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This study investigated the impact of the timing of adjuvant immune checkpoint inhibitor (ICI) initiation on survival in patients with stage III melanoma. The results showed that patients who initiated adjuvant ICI within 6 weeks of surgery had worse recurrence-free survival, while those who started treatment after 6 weeks had improved outcomes.
BackgroundThe optimal time to initiate adjuvant immune checkpoint inhibitors (ICI) following resection remains undefined. Herein, we investigated the impact of time to adjuvant ICI on survival in patients with stage III melanoma.MethodsPatients with resected stage III melanoma receiving adjuvant immune therapy were identified within a multi-institutional retrospective cohort. Patients were stratified by time to adjuvant ICI: within 6 weeks, 6-12 weeks, and greater than 12 weeks from surgery. Recurrence-free survival (RFS) was compared among time strata with Kaplan-Meier and Cox proportional hazards methods in the multi-institutional cohort.ResultsAltogether, 626 patients were identified within the multi-institutional cohort: 39% of patients initiated adjuvant ICI within 6 weeks, 42.2% within 6-12 weeks, and 18.8% greater than 12 weeks from surgery. In a multivariate Cox model, adjusting for histology, nodal tumor burden, and pathologic stage, we found that increased time to adjuvant ICI was associated with improved RFS. Patients who initiated adjuvant ICI within 6 weeks of surgery had worse RFS. These findings were preserved in a conditional landmark analysis and separate subgroups of patients with (1) new melanoma diagnoses, (2) occult stage III disease, and (3) those receiving anti-PD-1 monotherapy.ConclusionsOutcomes for patients with stage III melanoma are not compromised when adjuvant ICI is initiated beyond 6 weeks from resection. Additional work is needed to better understand the underlying mechanisms and implications of timing of adjuvant ICI on long-term outcomes.

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