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PD‐L1 expression by tumor cell lines: A predictive marker in melanoma
Author(s) -
Knol Anne C.,
Nguyen JeanMichel,
Pandolfino MarieChristine,
Denis Marc G.,
Khammari Amir,
Dréno Brigitte
Publication year - 2018
Publication title -
experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 96
eISSN - 1600-0625
pISSN - 0906-6705
DOI - 10.1111/exd.13526
Subject(s) - melanoma , medicine , lymph node , adjuvant , oncology , immunotherapy , flow cytometry , clinical significance , antigen , cancer research , immune system , immunology , cancer
Abstract Prognostic biomarkers for patients with melanoma after lymph node resection are of clinical relevance and could thus enable the identification of patients who therefore would most benefit from adjuvant treatment. The aim of this work was to determine, using an in vitro model, whether immune‐related biomarkers, such as MHC ‐class I and II , melanoma‐associated antigens, IDO 1 and PD ‐L1, could also be relevant to predict the risk of relapse of patients with stage III melanoma after lymph node resection. We established tumor cell lines from metastatic lymph nodes of 50 patients with melanoma. The expression of investigated biomarkers was determined on untreated and IFN ‐γ treated melanoma cell lines using flow cytometry. Among the selected biomarkers, the IFN ‐γ‐induced expression of PD ‐L1 and IDO 1 was associated with an increased risk of relapse ( P = .0001 and P = .013, respectively) and was also associated with death for IDO 1 ( P = .0005). In the future, this immunologic signature could permit the identification of patients at higher risk of relapse and justifying an adjuvant treatment using immunotherapy.