Is 4q13 a recurring breakpoint in solitary fibrous tumors?

Solitary fibrous tumor (SIT) is a mesenchymal neoplasm found predominantly in the subpleural region but also in many other body sites. We report a mal ignant solitary fibrous tumor of the peritoneum with a 47,XY,t(4;9)(q13;p23 ),+5 karyotype. The chromosome 4q13 breakpoint in the presented and previou sly published case of pleural solitary fibrous tumor with a 46,XY,t(4;15)(q 13;q26) karyotype was further characterized by fluorescence in situ hybridi zation analysis and localized within the 5-cM interval that was flanked by regions specific to YAC clones 761A7 and 886C11. Chromosome translocations involving chromosome 4q13 may characterize a separate cytogenetic subgroup of SIT. (C) 2001 Elsevier Science Inc. All rights reserved.