Anti-PD-1 elicits regression of undifferentiated pleomorphic sarcomas with UV-mutation signatures ================================================================================================= * Laurene S Cheung * Lingling Chen * Teniola F Oke * Thomas B Schaffer * Karim Boudadi * Jillian T Ngo * John McMahon Gross * Holly Kemberling * Luis A Diaz * Evan Lipson * John-WIlliam Sidhom * Janis Taube * Robert Anders * Drew M Pardoll * Dung T Le * Christian F Meyer * Nicolas Llosa