Cytogenetic studies of an endometrial polyp of an 82-year-old patient revealed a karyotype 46,XX,der(2)inv(2)(p25q21)ins(2;12)(p25;q13q14)t(2;12)(q21; q15),der(12)del(12)(q13q14)del(12)(q15). By fluorescence in situ hybridization (FISH) we found the chromosome 12 translocation breakpoint to be mapping within the third intron of the HMGI-C gene also harboring the breakpoints of translocations involving 12q15 seen in uterine leiomyomas, lipomas, pleomorphic adenomas, and pulmonary chondroid hamartomas.
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