MYD88 and diffuse large B-cell lymphoma: The findings that mutation of MYD88 was almost three times more common in primary DLBCL of the CNS or testis than that detected in DLBCL, NOS and the activation of associated BCR signal pathway in MYD88 mutation cases suggested that MYD88 might be a potential target in primary DLBCL of the CNS or testis.