SZT2 and primary effusion lymphoma: Kaposi sarcoma herpesvirus (KSHV) is a gammaherpesvirus that is the causal agent for several human malignancies and related disorders including Kaposi's sarcoma (KS), primary effusion lymphoma (PEL), KSHV-associated multicentric Castleman's disease (MCD), and KSHV inflammatory cytokine syndrome (KICS)1–4.