Immune activation and response to pembrolizumab in POLE-mutant endometrial cancer

Janice M. Mehnert, Anshuman Panda, Hua Zhong, Kim Hirshfield, Sherri Damare, Katherine Lane, Levi Sokol, Mark N. Stein, Lorna Rodriguez-Rodriquez, Howard L. Kaufman, Siraj Ali, Jeffrey S. Ross, Dean C. Pavlick, Gyan Bhanot, Eileen P. White, Robert S. DiPaola, Ann Lovell, Jonathan Cheng, Shridar Ganesan

Research output: Contribution to journalArticlepeer-review

297 Scopus citations


Antibodies that target the immune checkpoint receptor programmed cell death protein 1 (PD-1) have resulted in prolonged and beneficial responses toward a variety of human cancers. However, anti-PD-1 therapy in some patients provides no benefit and/or results in adverse side effects. The factors that determine whether patients will be drug sensitive or resistant are not fully understood; therefore, genomic assessment of exceptional responders can provide important insight into patient response. Here, we identified a patient with endometrial cancer who had an exceptional response to the anti-PD-1 antibody pembrolizumab. Clinical grade targeted genomic profiling of a pretreatment tumor sample from this individual identified a mutation in DNA polymerase epsilon (POLE) that associated with an ultramutator phenotype. Analysis of The Cancer Genome Atlas (TCGA) revealed that the presence of POLE mutation associates with high mutational burden and elevated expression of several immune checkpoint genes. Together, these data suggest that cancers harboring POLE mutations are good candidates for immune checkpoint inhibitor therapy.

Original languageEnglish
Pages (from-to)2334-2340
Number of pages7
JournalJournal of Clinical Investigation
Issue number6
StatePublished - Jun 1 2016

Bibliographical note

Publisher Copyright:
© 2016, American Society for Clinical Investigation. All rights reserved.

ASJC Scopus subject areas

  • General Medicine


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