PD-L1 is a double-edged sword in colorectal cancer: the prognostic value of PD-L1 depends on the cell type expressing PD-L1.

A new interesting article has been published in J Cancer Res Clin Oncol. 2019 Jul;145(7):1785-1794. doi: 10.1007/s00432-019-02942-y. Epub 2019 May 25. and titled:

PD-L1 is a double-edged sword in colorectal cancer: the prognostic value of PD-L1 depends on the cell type expressing PD-L1.

Authors of this article are:

Ho HL, Chou TY, Yang SH, Jiang JK, Chen WS, Chao Y, Teng HW.

A summary of the article is shown below:

PURPOSE: To investigate the associations between programmed cell death ligand-1 (PD-L1) on tumor cells (TCs) or PD-L1 on tumor-infiltrating immune cells (TIICs) and the microsatellite instability (MSI) status in colorectal cancer (CRC).METHODS: In total, 238 CRC patients were enrolled. PD-L1 expression and MSI status were studied by immunohistochemical staining and polymerase chain reaction. The χ2 test was used to compare characteristics. The Kaplan-Meier method was used for survival analysis. Cox proportional hazards models were used to determine the prognostic influence of clinicopathological factors.RESULTS: Eighteen patients (7.6%) were had MSI-high (MSI-H) CRC. The number of patients with PD-L1 expression on TCs, stromal TIICs and intraepithelial TIICs was 13 (5.5%), 64 (26.9%) and 45 (18.9%), respectively. The MSI-H phenotype was significantly associated with younger age, right sidedness, mucinous component, high grade, stromal TIICs expressing PD-L1 (P = 0.042) and intraepithelial TIICs expressing PD-L1 (P < 0.001), but not TCs expressing PD-L1. PD-L1-expressing TCs were an independent marker of poor prognosis [hazard ratio (HR) = 3.387, P = 0.003], and PD-L1-expressing stromal TIICs were an independent marker of good prognosis (HR = 0.551, P < 0.001).CONCLUSIONS: PD-L1-expressing TCs were a marker of poor prognosis; in contrast, PD-L1-expressing TIICs were a marker of good prognosis. The MSI-H phenotype was associated with the presence of PD-L1-expressing TIICs, but not of PD-L1-expressing TCs.
Check out the article’s website on Pubmed for more information:

This article is a good source of information and a good way to become familiar with topics such as: Aged;B7-H1 Antigen;Colorectal Neoplasms;Female;Humans;Immune System;Immunohistochemistry;Kaplan-Meier Estimate;Male;Microsatellite Instability;Middle Aged;Prognosis;Proportional Hazards Models.

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