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. 2023 Sep 21;72(11):3839–3850. doi: 10.1007/s00262-023-03539-8

Fig. 4.

Fig. 4

Case study suggesting dependence on continuous PD-1 blockade for disease control (patient Melanoma-15 from Fig. 1) Adult male with metastatic melanoma was treated with pembrolizumab for 47 months (26 months at standard-frequency dosing (SFD) and 21 months at reduced-frequency dosing (RFD) before he electively discontinued ICI (panel A). 14 months after elective discontinuation, his disease progressed (panel B), suggesting potential role of prolonged PD-1 blockade in controlling his disease. Reintroduction of nivolumab at SFD has recaptured his disease response (panel C), which is ongoing at 35 months after restarting nivolumab. This case suggests the importance of continuous PD-1 blockade in maintaining immune equilibrium in patients with residual disease