IL6 and Kaposi's sarcoma: KS-IRIS: Kaposi sarcoma immune reconstitution inflammatory syndrome; KICS: Kaposi sarcoma inflammatory cytokine syndrome; ART: antiretroviral therapy; KS: Kaposi sarcoma; HHV-8: human herpesvirus-8; IL-6: interleukin-6; IL-10: interleukin-10; MCD: multicentric Castleman disease