Despite the high frequency of fibroadenomas of the breast, cytogenetic
results are relatively limited. We describe our cytogenetic findings
in 30 fibroadenomas. Of these, three showed clonal chromosome abnormal
ities, i.e., 46,XX,der(6)t(1;6)(q25;p21.3); 48,XX,del(6)(q21),r(11)(?)
,der(14)t(6;24) (q21;q32), + 2mar; and 47,XX,+5.