HLA-A and neoplasm: In line with Paulson et al. ’s observations, 37% (n = 20) MCC lesions entirely lacked HLA-A expression (HLA score 0), 37% (n = 21) were characterized by a low expression (HLA score 1–3), 12% (n = 7) by an intermediate expression (HLA score 4–6), whereas only 14% (n = 8) expressed high amounts of HLA-A molecules on most of the tumor cells (HLA score 8–12).