Cancer research and treatment · 2025
Clinicopathological Factors Influencing PD-L1 Expression and the Effect of Immune Checkpoint Inhibitors on Survival Outcomes in Patients with Gastric Cancer Depending on Sex in a Tertiary Hospital in South Korea.
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Lee Jeong Hwan, Kim Nayoung, Kim Ji-Hyun, Oh Hyeon Jeong, Kim Yeejin, Choi Yonghoon, Jo Hyemin, Lee Ho-Kyoung, Choi Jinju, Jun Yu Kyung, Yoon Hyuk, Shin Cheol Min, Park Young Soo, Lee Dong Ho, Lee Hye Seung, Kang So Hyun, Park Young Suk, Ahn Sang-Hoon, Suh Yun-Suhk, Park Do Joong, Kim Hyung Ho, Kim Ji-Won, Kim Jin Won, Lee Keun-Wook, Chang Won, Lee Yoon Jin, Lee Kyoung Ho, Kim Young Hoon, Ahn Soyeon
Аннотация
PURPOSE: Programmed cell death ligand-1 (PD-L1) negatively regulates T-cell activation, and exhibits sex-based differences in expression and immune responses. This study investigated sex-related differences in clinicopathological factors influencing PD-L1 expression and the effect of immune checkpoint inhibitors (ICIs) on survival in gastric cancer (GC) patients in South Korea.
MATERIALS AND METHODS: We analyzed a prospective cohort of 468 GC patients who underwent PD-L1 immunohistochemistry. Age, tumor characteristics, molecular features, and survival outcomes were compared by sex. Multivariate analyses, including Cox proportional hazards modeling with an interaction term for sex, were performed.
RESULTS: Among 468 patients, 280 (59.8%) were PD-L1 positive. In the overall cohort, PD-L1 positivity was significantly associated with Epstein-Barr virus (EBV) infection (odds ratio [OR], 7.46; p < 0.001), antral location of GC (OR, 1.84; p=0.027), and macrosatellite instability-high (MSI-H) (OR, 5.04; p=0.027). Diffuse-type histology was inversely associated (OR, 0.22; p=0.041). In males, EBV (OR, 36.27) and antral location (OR, 2.38) were significant. In females, only MSI-H was significant (OR, 11.63). ICI-containing therapy significantly improved survival in males (p=0.012) but not in females (p=0.415). Cox regression showed a survival benefit from ICIs (hazard ratio, 0.70; p=0.080), with a borderline-significant interaction by sex (p=0.073).
CONCLUSION: PD-L1 expression and therapeutic efficacy of ICIs differ by sex in GC. EBV infection and antral tumor location were independent factors in males, while MSI-H status was significant in females. These findings highlight the importance of sex-based immunobiology in tailoring GC treatment strategies.
MATERIALS AND METHODS: We analyzed a prospective cohort of 468 GC patients who underwent PD-L1 immunohistochemistry. Age, tumor characteristics, molecular features, and survival outcomes were compared by sex. Multivariate analyses, including Cox proportional hazards modeling with an interaction term for sex, were performed.
RESULTS: Among 468 patients, 280 (59.8%) were PD-L1 positive. In the overall cohort, PD-L1 positivity was significantly associated with Epstein-Barr virus (EBV) infection (odds ratio [OR], 7.46; p < 0.001), antral location of GC (OR, 1.84; p=0.027), and macrosatellite instability-high (MSI-H) (OR, 5.04; p=0.027). Diffuse-type histology was inversely associated (OR, 0.22; p=0.041). In males, EBV (OR, 36.27) and antral location (OR, 2.38) were significant. In females, only MSI-H was significant (OR, 11.63). ICI-containing therapy significantly improved survival in males (p=0.012) but not in females (p=0.415). Cox regression showed a survival benefit from ICIs (hazard ratio, 0.70; p=0.080), with a borderline-significant interaction by sex (p=0.073).
CONCLUSION: PD-L1 expression and therapeutic efficacy of ICIs differ by sex in GC. EBV infection and antral tumor location were independent factors in males, while MSI-H status was significant in females. These findings highlight the importance of sex-based immunobiology in tailoring GC treatment strategies.