Immunoexpression of macroH2A in uveal melanoma

MacroH2A is a histone variant whose expression has been studied in several neoplasms, including cutaneous melanomas (CMs). In the literature, it has been demonstrated that macroH2A.1 levels gradually decrease during CM progression, and a high expression of macroH2A.1 in CM cells relates to a better prognosis. Although both uveal and cutaneous melanomas arise from melanocytes, uveal melanoma (UM) is biologically and genetically distinct from the more common cutaneous melanoma. Metastasis to the liver is a frequent occurrence in UM, and about 40%-50% of patients die of metastatic disease, even with early diagnosis, proper treatment, and close follow-up. We wanted to investigate macroH2A.1 immunohistochemical expression in UM. Our results demonstrated that mH2A.1 expression was higher in metastaticUM(21/23, 91.4%), while only 18/32 (56.3%). UMswithout metastases showed mH2A.1 staining. These data could suggest a possible prognostic role for mH2A.1 and could form a basis for developing new pharmacological strategies for UM treatment.