Telomeric association in a malignant fibrous histiocytoma.

In a malignant soft-tissue fibrous histiocytoma 50-56 chromosomes were found in the majority of the metaphases. The most frequent numerical aberrations were one or two extra copies of chromosomes 4, 5, 18, 20, 22, and a missing chromosome 15. Structural rearrangements encountered were 11p+ and 1-5 unidentifiable markers. The most conspicuous feature was pairs of chromosomes intimately associated or fused at their telomeres, observed in 20 out of 22 metaphases. Although the telomeres of 6p, 11p, 16q, 20q, and 21p were involved most frequently, no preferential pattern of associations was detectable. This peculiar chromosomal behavior is compared to similar observations recently reported in a case of a B-cell lymphoid leukemia.