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