Biomarkers of pembrolizumab efficacy in advanced anal squamous cell carcinoma: analysis of a phase II clinical trial and a cohort of long-term responders oleh Jeffrey A Meyerhardt, Sunil Kumar, Jessica A Zerillo, Aparna Parikh, James M Cleary, Scott Rodig, Benjamin Schlechter, Kimmie Ng, Stephanie K Dougan, Nora Horick, Glenn J Hanna, Andrew L Coveler, Anuj K Patel, Nadine J McCleary, Douglas A Rubinson, Jeffrey W Clark, Kent Mouw, Kathleen Pfaff, Thomas A Abrams, Matthew B Yurgelun, Eliezer M Van Allen, S Jennifer Wang, Leah H Biller, Harshabad Singh, Emma L Welsh, Brandon M Huffman, Lestat R Ali, Megan T Hoffman, Katherine A Metayer, Shayla Murray, Alexandra Bird, Jennifer A Chan, Wolfram Goessling, Jeffrey S Wisch, Brendan Reardon, Robert J Mayer, Catherine Del Vecchio Fitz, Charlotte Kuperwasser