Comparative effectiveness of second-line ipilimumab vs. nivolumab in combination with ipilimumab in patients with advanced melanoma who received frontline anti-PD-1 antibodies.

Anti-PD-1 antibodies are commonly used as frontline therapy for patients with metastatic melanoma. Although these medications can cause long term responses, a significant number of patients will not respond or will lose response. Optimal second-line therapy after losing response to anti-PD-1 antibodies is not well established. Therefore, we retrospectively compared the overall survival of patients who lost response to anti-PD1 antibodies between patients treated with single agent ipilimumab or ipilimumab and nivolumab. A de-identified U.S. nationwide electronic health record-derived database was reviewed for patients with advanced melanoma treated with single agent anti-PD1 antibodies in the frontline setting and who subsequently received second-line ipilimumab or combination ipilimumab and nivolumab. Overall survival from initiation of second-line therapy was compared using Kaplan Meier curves and log-rank analysis. Other known prognostic markers for melanoma were analyzed for correlation with survival in a similar fashion. Disease characteristics between the two groups were compared using chi-square analysis. A total of 842 patients with advanced melanoma who received frontline anti-PD-1 antibodies were included for analysis. Of these, 57 received either ipilimumab ( In this small, retrospective analysis, for patients who lost response to frontline anti-PD-1 therapy, patients treated with ipilimumab had similar survival to those who received ipilimumab in combination with anti-PD-1 antibodies.