A single dose of neoadjuvant PD-1 blockade predicts clinical outcomes in resectable melanoma
Alexander C Huang, Robert J Orlowski, Xiaowei Xu, Rosemarie Mick, Sangeeth M George, Patrick K Yan, Sasikanth Manne, Adam A Kraya, Bradley Wubbenhorst, Liza Dorfman, Kurt D'Andrea, Brandon M Wenz, Shujing Liu, Lakshmi Chilukuri, Andrew Kozlov, Mary Carberry, Lydia Giles, Melanie W Kier, Felix Quagliarello, Suzanne McGettigan, Kristin Kreider, Lakshmanan Annamalai, Qing Zhao, Robin Mogg, Wei Xu, Wendy M Blumenschein, Jennifer H Yearley, Gerald P Linette, Ravi K Amaravadi, Lynn M Schuchter, Ramin S Herati, Bertram Bengsch, Katherine L Nathanson, Michael D Farwell, Giorgos C Karakousis, E John Wherry, Tara C Mitchell, Alexander C Huang, Robert J Orlowski, Xiaowei Xu, Rosemarie Mick, Sangeeth M George, Patrick K Yan, Sasikanth Manne, Adam A Kraya, Bradley Wubbenhorst, Liza Dorfman, Kurt D'Andrea, Brandon M Wenz, Shujing Liu, Lakshmi Chilukuri, Andrew Kozlov, Mary Carberry, Lydia Giles, Melanie W Kier, Felix Quagliarello, Suzanne McGettigan, Kristin Kreider, Lakshmanan Annamalai, Qing Zhao, Robin Mogg, Wei Xu, Wendy M Blumenschein, Jennifer H Yearley, Gerald P Linette, Ravi K Amaravadi, Lynn M Schuchter, Ramin S Herati, Bertram Bengsch, Katherine L Nathanson, Michael D Farwell, Giorgos C Karakousis, E John Wherry, Tara C Mitchell
Abstract
Immunologic responses to anti-PD-1 therapy in melanoma patients occur rapidly with pharmacodynamic T cell responses detectable in blood by 3 weeks. It is unclear, however, whether these early blood-based observations translate to the tumor microenvironment. We conducted a study of neoadjuvant/adjuvant anti-PD-1 therapy in stage III/IV melanoma. We hypothesized that immune reinvigoration in the tumor would be detectable at 3 weeks and that this response would correlate with disease-free survival. We identified a rapid and potent anti-tumor response, with 8 of 27 patients experiencing a complete or major pathological response after a single dose of anti-PD-1, all of whom remain disease free. These rapid pathologic and clinical responses were associated with accumulation of exhausted CD8 T cells in the tumor at 3 weeks, with reinvigoration in the blood observed as early as 1 week. Transcriptional analysis demonstrated a pretreatment immune signature (neoadjuvant response signature) that was associated with clinical benefit. In contrast, patients with disease recurrence displayed mechanisms of resistance including immune suppression, mutational escape, and/or tumor evolution. Neoadjuvant anti-PD-1 treatment is effective in high-risk resectable stage III/IV melanoma. Pathological response and immunological analyses after a single neoadjuvant dose can be used to predict clinical outcome and to dissect underlying mechanisms in checkpoint blockade.
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