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Activation of the Janus Kinase (JAK) / signal transducer and activator of transcription (STAT) signaling pathway has been associated with a range of human malignancies.Primary effusion lymphoma (PEL), a cancerous proliferation of lymphocytic B-cells, is caused by the Kaposis sarcoma-associated herpesvirus (KSHV).Our previous study showed that constitutively phosphorylation of STAT6 on tyrosine 641 (pSTAT6) in both PEL cell lines BC3 and BCBL1.