MYD88/CD79B mutations are also observed in other subtypes of DLBCL, such as primary testicular DLBCL,11, 15 primary breast DLBCL,16, 17 primary cutaneous DLBCL leg‐type,12 intravascular large B cell lymphoma (IVLBCL),18 and malignant retinal lymphoma,19, 20 and these subtypes have a higher incidence of CNS infiltration than subtypes without MYD88/CD79B mutations.6 Here, CD79B is linked to breast diffuse large B-cell lymphoma.