RESUMO
BACKGROUND: Multiple sclerosis (MS) patients have a low general cancer risk and cases of neoplastic comorbidity are attributed by many researchers in chance, or therapeutical side-effects. Human leucocyte antigen (HLA) class II allele DRB1 15:01 is considered the main genetic factor independently associated with increased susceptibility for MS in Caucasians. Epstein-Barr virus (EBV) has also been proven to be a core triggering factor in MS initiation and progress, mainly in HLA-DRB1 15:01 positive MS patients. CASE REPORT: We present an exceptional case of a Greek-origin woman, carrying a distinct immunogenetic profile (HLA-A 26:01-Cw 06:02-DRB1 15:01), which gradually developed psoriasis, nasopharyngeal carcinoma (NPC), MS, breast cancer, uterine leiomyoma and other neoplasms. DISCUSSION: EBV plays a fundamental role in the pathogenesis of both autoimmunity (i.e. MS) and cancer (i.e. NPC). Our patient's immunogenetic profile included HLA alleles which are associated with psoriasis (Cw 06:02), NPC (A 26:01), MS (DRB1 15:01) and increased risk of MS, in patients carrying EBV (DRB1 15:01). We made a targeted review of the literature finding data supporting an EBV-HLA interaction mechanism behind our patient's unique combination of disorders, suggesting that beyond the standard role of each factor, their combination could act as the hidden link, in initiation or/and comorbidity of autoimmunity and cancer.