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HLA-G expression in melanomas.

Stefano Marletta¹, Ilaria Girolami², Enrico Munari³

¹Department of Pathology and Diagnostics, Section of Pathology, University Hospital of Verona, Verona, Italy.

International Reviews of Immunology

|January 11, 2021

Summary

This summary is machine-generated.

Human leukocyte antigen G (HLA-G) is expressed in melanomas, correlating with aggressive features but lacking prognostic value. HLA-G is not implicated in uveal melanomas, suggesting complex immune interactions in melanoma progression.

Keywords:

Cancer immunobiology Human leukocyte antigen G melanomas systematic review

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Area of Science:

Immunology
Oncology
Molecular Biology

Background:

Human leukocyte antigen G (HLA-G) is a non-classical HLA class I molecule.
HLA-G plays a role in immune tolerance and tumor immune escape.
Its expression in malignant melanoma warrants investigation for clinical relevance.

Purpose of the Study:

To review and synthesize published literature on HLA-G expression in malignant melanomas.
To analyze the clinicopathological and prognostic correlates of HLA-G expression.
To evaluate the role of HLA-G in melanoma immunobiology.

Main Methods:

Systematic literature search of electronic databases.
Analysis of studies reporting HLA-G expression in human melanoma samples.
Evaluation of data from immunohistochemistry, soluble assays, and polymerase chain reaction.

Main Results:

16 studies were included, analyzing HLA-G expression in malignant melanocytic lesions.
Overall, 55% of tumors showed significant HLA-G expression, with varying rates depending on the detection method.
While HLA-G expression correlated with aggressive clinicopathological features, it did not demonstrate prognostic value. Uveal melanomas were consistently negative for HLA-G.

Conclusions:

HLA-G is involved in melanoma-immune system interactions but is unlikely to be the sole determinant of prognosis.
Current evidence does not support HLA-G as a prognostically relevant molecule in melanoma.
HLA-G appears to be uninvolved in the immunobiology of uveal melanomas.