Clinicopathologic correlation of programmed death ligand-1 expression in non-small cell lung carcinomas: A report from India.

Abstract:

INTRODUCTION:Increased expression of Programmed death ligand-1 (PD-L1) on cancer cells and immune cells predict response to PD-1/PDL1 inhibitors. Data regarding frequency and pattern of PD-L1 expression in NSCLC from India is not available. OBJECTIVES:To analyse PD-L1 expression on tumour cells (TC) and immune cells (IC) and to correlate PD-L1 expression with baseline clinico-pathological characteristics, oncogenic drivers and outcome data. MATERIALS AND METHODS:PD-L1 expression on tumour cells and immune cells was analysed. RESULTS:Eighty-nine cases of resected NSCLC were included. Squamous cell carcinoma was more common than adenocarcinoma. IC were present in almost all cases. Immunopositivity for PD-L1 in TC and IC was 27% and 18% respectively. PD-L1 immunopositivity in TC or IC did not correlate with age, sex, stage or mutation status however sarcomatoid carcinoma and solid predominant adenocarcinomas showed higher positivity rates. PD-L1 immunopositivity in ICs was found to correlate with better disease free survival. CONCLUSION:PD-L1 immunopositivity was seen in a quarter of NSCLC patients in India. PDL1 positivity on immune cells may be associated with better prognosis in resected NSCLC. However the prognostic value of PD-L1 and clinical response to check point inhibitors in Indian population need to be validated in larger studies.

journal_name

Ann Diagn Pathol

authors

Vallonthaiel AG,Malik PS,Singh V,Kumar V,Kumar S,Sharma MC,Mathur S,Arava S,Guleria R,Jain D

doi

10.1016/j.anndiagpath.2017.07.001

subject

Has Abstract

pub_date

2017-12-01 00:00:00

pages

56-61

eissn

1092-9134

issn

1532-8198

pii

S1092-9134(17)30164-8

journal_volume

31

pub_type

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