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 language | English |
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Article number | e1460298 |
Journal | Oncoimmunology |
Volume | 7 |
Issue number | 12 |
DOIs | |
State | Published - Dec 2 2018 |
Externally published | Yes |
Keywords
- 22C3 assay
- ADORA2A
- atezolizumab
- immunohistochemistry
- PD-1
- SP142 assay