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- W3100676105 abstract "Abstract Background Data relating to the efficacy of immune checkpoint inhibitors (ICI) for salivary gland carcinomas (SGC) is gradually evolving with responses varying among different histotypes. To address these disparities, this retrospective analysis examined the prevalence of recognized biomarkers of response to ICI; namely programmed death‐1 (PD‐1), programmed death‐ligand 1 (PD‐L1), combined positive score (CPS), epidermal growth factor receptor (EGFR), and microsatellite instability (MSI) in patients with SGC with an aim to determine any prognostic or survival benefits and stratify the use of ICI in this disease. Patients and methods Of 52 patients with primary SGC eligible for this study, the most common histological types were adenoid cystic carcinoma (n = 17, 33%), salivary duct carcinoma (n = 14, 27%), mucoepidermoid carcinoma (n = 11, 21%), and acinic cell carcinoma (n = 6, 11%). Immunohistochemistry (IHC) was performed using the Ventana Discovery Ultra auto‐staining platform for EGFR, PD‐1, PD‐L1, and mismatch repair (MMR) proteins. CPS ≥1 defined PD‐L1 positive cases and log‐rank testing was performed to examine the relationship between PD‐L1 expression status and disease‐free survival (DFS) and overall survival (OS). Results CPS positivity was seen in 9 (17.3%) patients, none of which were adenoid cystic carcinoma. All 52 (100%) cases expressed retained MMR proteins inferring microsatellite stability (MSS) and EGFR expression was identified in 45 of 52 (86.5%) patients. CPS positivity (score ≥1) was significantly associated with advanced pathological T status ( P = .021), advanced pathological N status ( P = .006), high histological tumor grade ( P = .045), and positive histological margin ( P = .023). Patients with PD‐L1 positivity in tumor cells did not have an inferior 3‐year OS ( P = .93). Conclusion The data from this retrospective study highlighting the uniform microsatellite stability alongside the low prevalence of CPS positivity suggests that only a minority of SGC patients may benefit from ICI therapy alone. The high rates of EGFR expression in SGC may be a target to augment immune checkpoint therapy response." @default.
- W3100676105 created "2020-11-23" @default.
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- W3100676105 date "2020-11-09" @default.
- W3100676105 modified "2023-10-12" @default.
- W3100676105 title "Therapeutic implications of immune‐profiling and <scp>EGFR</scp> expression in salivary gland carcinoma" @default.
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- W3100676105 doi "https://doi.org/10.1002/hed.26529" @default.
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