Monosomy 13 in Mammary Myofibroblastoma.

BACKGROUND/AIM Myofibroblastoma of the breast is a rare benign mesenchymal tumor whose morphology is similar to that of spindle-cell lipoma. The few hitherto genetically investigated mammary myofibroblastomas have been shown to have had loss of material from chromosome 13, changes that are also common in spindle-cell lipoma. Our aim was to add to the existing knowledge of genetic aberrations in mammary myofibroblastoma by investigating another such tumor. MATERIALS AND METHODS Cytogenetic and array comparative genome hybridization (aCGH) analyses were performed on a surgically removed mammary myofibroblastoma from a 76-year-old man. RESULTS Short-term cultured cells from the tumor showed the karyotype 45,XY,-13[3]/44~45,idem,add(19)(q13)[cp2]. aCGH detected loss of one entire chromosome 13 and heterozygous loss from 19q between sub-band 19q13.12 and 19qter. CONCLUSION These findings add to the evidence that loss of 13q material is typical of mammary myofibroblastomas.