PD-L2 amplification and durable disease stabilization in patient with urothelial carcinoma receiving pembrolizumab

Saby George, Antonios Papanicolau-Sengos, Felicia L. Lenzo, Jeffrey M. Conroy, Mary Nesline, Sarabjot Pabla, Sean T. Glenn, Blake Burgher, Jonathan Andreas, Vincent Giamo, Moachun Qin, Yirong Wang, Lorenzo Galluzzi, Carl Morrison

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

We report the immunological profile of a patient with upper-tract urothelial carcinoma experiencing stable disease on pembrolizumab for 20 months. The tumor exhibited extensive infiltration by CD8+ cytotoxic T lymphocytes, low-to-moderate mutational burden, no PD-L1 staining by commercially available immunohistochemical assays, but amplification of CD274 (coding for PD-L1) and/or PDCD1LG2 (encoding PD-L2) by fluorescence in situ hybridization. RNA-seq revealed multiple biomarkers of an ongoing immune response and compensatory immune evasion, including moderate PD-L1 levels coupled with robust PD-L2 expression. Pending validation in additional patients, these findings suggest that PD-L2 expression levels may constitute a biomarker of response to immune checkpoint blockade in urothelial carcinoma.

Original languageEnglish
Article numbere1460298
JournalOncoimmunology
Volume7
Issue number12
DOIs
StatePublished - Dec 2 2018
Externally publishedYes

Keywords

  • 22C3 assay
  • ADORA2A
  • atezolizumab
  • immunohistochemistry
  • PD-1
  • SP142 assay

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