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- Title
Discordancy and changes in the pattern of programmed death ligand 1 expression before and after platinum-based chemotherapy in metastatic gastric cancer.
- Authors
Yang, Ji Hyun; Kim, Hyunho; Roh, Sang Young; Lee, Myung Ah; Park, Jae Myung; Lee, Han Hee; Park, Cho Hyun; Lee, Han Hong; Jung, Eun Sun; Lee, Sung Hak; Lee, Young Joon; Choi, Moon Hyung; Kim, Okran; Kim, In-Ho
- Abstract
Background: Our goal was to evaluate changes in PD-L1 expression in primary tumours of metastatic gastric cancer before and after chemotherapy.Methods: We evaluated the PD-L1 expression of 72 patients with primary gastric cancer, before and after palliative first-line platinum-based chemotherapy, between January 2015 and March 2017. The PD-L1 ratio was defined as pre-chemotherapy PD-L1 expression divided by the post-chemotherapy PD-L1 expression.Results: In 30 patients with PD-L1 negative pre-chemotherapy, 12 (40%) were positive post-chemotherapy; among the 42 patients with PD-L1 positive pre-chemotherapy, 24 (57.1%) were negative post-chemotherapy. The degree of PD-L1 expression decreased from 58.3% before chemotherapy to 41.7% after chemotherapy (P = 0.046). Among patients with complete response/partial response (CR/PR), the degree of PD-L1 expression decreased (P = 0.002), as well as PD-L1 positivity with statistical significance (P = 0.013) after chemotherapy, but not among patients with stable disease/progressive disease (SD/PD). Higher disease control rates (CR/PR/SD) were observed in patients with an elevated PD-L1 ratio (P = 0.043). Patients with a high PD-L1 ratio (> 1) were found to be associated with a better progression-free survival (HR 0.34, 95% CI 0.17-0.67, P = 0.002).Conclusions: PD-L1 expression can change during chemotherapy. Moreover, changes in patterns of PD-L1 expression might be associated with patient prognosis and response to chemotherapy.
- Subjects
METASTASIS; STOMACH cancer
- Publication
Gastric Cancer, 2019, Vol 22, Issue 1, p147
- ISSN
1436-3291
- Publication type
Article
- DOI
10.1007/s10120-018-0842-x