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- W2022465587 abstract "This study evaluated the expression of PD-L1 in immunotherapy-naïve metastatic melanoma patients to determine longitudinal intrapatient concordance and correlate PD-L1 status with clinicopathologic characteristics and outcome. PD-L1 expression was assessed by immunohistochemistry in 58 patients (43 primary tumors, 96 metastases). Seventy-two percent of patients had at least one specimen expressing PD-L1 in ≥ 1% of tumor cells. Median positive tumor cell count overall was low (8% in nonzero specimens). PD-L1 expression was frequently discordant between primary tumors and metastases and between intrapatient metastases, such that 23/46 longitudinal patient specimens were discordant. PD-L1 was associated with higher TIL grade but not with other known prognostic features. There was a positive univariate association between PD-L1 expression in locoregional metastases and melanoma-specific survival, but the effect was not observed for primary melanoma. In locoregional lymph node metastasis, PD-L1+/TIL+ patients had the best outcome, and PD-L1+/TIL- patients had poor outcome." @default.
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- W2022465587 date "2014-12-22" @default.
- W2022465587 modified "2023-10-10" @default.
- W2022465587 title "PD-L1 expression in melanoma shows marked heterogeneity within and between patients: implications for anti-PD-1/PD-L1 clinical trials" @default.
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- W2022465587 doi "https://doi.org/10.1111/pcmr.12340" @default.
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