No increased chromosome breakage in skin fibroblasts from patients with musculoskeletal sarcoma.

The frequency of structural chromosome aberrations was studied in cultured skin fibroblasts from 25 untreated patients with musculoskeletal sarcoma and 25 controls. Subepidermal skin biopsies from the sarcoma patients were taken either close to the tumor (10 patients), at a distance from the tumor, i.e., from a contralateral limb (8 patients), or from both sites (7 patients). The aberration frequencies in fibroblasts obtained from different locations did not differ significantly (P greater than 0.05). The two groups of fibroblast lines were therefore pooled, yielding a total of 25 sarcoma patients with the following mean frequencies of aberrant cells, and gap, break, and gap + break events: 5.3, 2.8, 3.2, and 6.1. Among the controls the corresponding rates were 5.1, 2.6, 3.2, and 5.8. The differences were not statistically significant. These results provide no evidence of local differences in chromosome aberration frequencies, or that inherent chromosomal instability is important for the pathogenesis of sarcomas.