Abstract:
BACKGROUND:Several studies have assessed the expression of programmed death-ligand 1 (PD-L1) in resected surgical specimens of non-small-cell lung cancer (NSCLC). However, the expression of PD-L1 in smaller biopsy samples of advanced NSCLC has not been reported. PATIENTS AND METHODS:A total of 79 patients with NSCLC at our institution with available biopsy samples and resected specimens were retrospectively enrolled in the present study. PD-L1 expression was assessed by immunohistochemistry and scored using the hybrid scoring method. The concordance rates for the expression of PD-L1 between the 2 samples were analyzed. RESULTS:The pathologic stage of the patients (51 men, 28 women; median age, 68 years) was stage I in 37, stage II in 18, and stage III in 24. The diagnostic procedures included transbronchial biopsy in 59, transbronchial needle aspiration biopsy in 14, and computed tomography (CT)-guided needle biopsy in 6. The positivity rate of PD-L1 in these samples was 38.0% (27 transbronchial biopsies, 6 transbronchial needle aspiration biopsies, 3 CT-guided needle biopsies) versus 35.4% in the resected specimens. The median hybrid score was 0 (range, 0-170), and the mean score was 28.7 ± 43.4. Comparing the biopsy samples and resected specimens with a score of ≥ 1 as positive for PD-L1 staining, 6 tumors were discordant for PD-L1 expression and 73 were concordant, for a concordance rate of 92.4% and κ value of 0.8366. CONCLUSION:PD-L1 status showed good concordance between the biopsy samples and resected specimens. These small samples, even those derived from transbronchial needle aspiration biopsies, appear adequate for the assessment of PD-L1 expression.
journal_name
Clin Lung Cancerjournal_title
Clinical lung cancerauthors
Kitazono S,Fujiwara Y,Tsuta K,Utsumi H,Kanda S,Horinouchi H,Nokihara H,Yamamoto N,Sasada S,Watanabe S,Asamura H,Tamura T,Ohe Ydoi
10.1016/j.cllc.2015.03.008subject
Has Abstractpub_date
2015-09-01 00:00:00pages
385-90issue
5eissn
1525-7304issn
1938-0690pii
S1525-7304(15)00083-2journal_volume
16pub_type
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