Bacon et al. described five cases of primary follicular lymphoma of the testis and epididymis in adults characterized by immunophenotypic expression of CD10 and BCL6, which lacked immunophenotypic expression of BCL2 and lacked t(14;18)(q32;q21)/IGH-BCL2 and BCL6 rearrangements [31]. This evidence concerns the gene BCL6 and follicular lymphoma.