A fibroadenoma with a t(4;12) (q27;q15) affecting the HMGI-C gene, a member of the high mobility group protein gene family


An intracanalicular fibroadenoma of the breast showing a clonal chromosomal aberration t(4;12) (q27;q15) as the sole cytogenetic abnormality is described. In order to narrow down the breakpoint region on chromosome 12 on the molecular level we performed fluorescencein situ hybridization (FISH) analysis with a cosmid pool originating from a YAC-contig overspanning part of the region 12q14–15. We were able to narrow down the breakpoint to an approximately 230kb fragment belonging to the HMGI-C gene which maps within an area recently designated as MAR (Multiple Aberration Region). The chromosomal breakpoints of other frequent benign solid tumors, i.e. lipomas, uterine leiomyomas, and pleomorphic adenomas are clustered within the third intron of that gene.

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Staats, B., Bonk, U., Wanschura, S. et al. A fibroadenoma with a t(4;12) (q27;q15) affecting the HMGI-C gene, a member of the high mobility group protein gene family. Breast Cancer Res Tr 38, 299–303 (1996). https://doi.org/10.1007/BF01806149

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Key words

  • chromosome 12
  • fibroadenoma
  • mesenchymal growth