Combined PD-1 and CTLA-4 Blockade in an International Cohort of Patients with Acral Lentiginous Melanoma
Abstract
BACKGROUND
Combination immune checkpoint blockade targeting PD-1 and CTLA-4 leads to high response rates and improved survival in advanced cutaneous melanoma (CM). Less is known about the efficacy of this combination in acral lentiginous melanoma (ALM).
OBJECTIVES
To determine the efficacy of combination immune checkpoint blockade targeting PD-1 and CTLA-4 in a real-world, diverse population of ALM.
METHODS
This multi-institutional retrospective study analyzed patients with histologically confirmed ALM treated with the combination of PD-1 and CTLA-4 inhibitors between 2010-2022. The primary objective of the study was objective response rate (ORR) per RECIST criteria. The secondary objectives were progression-free survival (PFS) and overall survival (OS).
RESULTS
In total, 109 patients with advanced ALM treated with combined PD-1 and CTLA-4 blockade in any line of treatment were included. The majority of patients had stage IV disease (n=81, 74.2%). The ORR for the entire cohort was 18.3% (95% CI 11.6-26.9%), with 9 (8.3%) complete responses (CR) and 11 (10.1%) partial responses (PR). An additional 22 patients (20.2%) had stable disease (SD), and the disease control rate (DCR) was 38.5%. The median PFS was 4.2 months [95% CI 3.25-5.62], while the median OS was 17 months [95% CI 12.4%-23.1%]. A total of 95 patients (87.2%) had a treatment-related adverse event, with 40.4% (n=44/109) experiencing at least one grade 3 or 4 toxicity. Elevated LDH (p=.04), 2+ lines of prior therapy…
How strong is the evidence?
Evidence Hub reads this as a cohort study, done in people. Its evidence level is 3 of 5 (Moderate · trial / cohort / secondary analysis). Trials without a large randomized design, cohorts and secondary analyses give moderate evidence. Reported size: 109 participants or records.
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