Structural abnormalities of chromosome 2 in benign thyroid tumors. Three new cases and review of the literature.

Here we report our cytogenetic findings on three cases of nodular goiter, all showing structural clonal abnormalities of chromosome 2. In the first case, we found a t(2;3)(q21;q27 or q28) in two nodules of the same patient. The second case revealed a t(2;20;3)(p21;q11.2;p25), and the third case showed a t(1;2)(p22;p13). When the data from the literature and the present cases are summarized, the results suggest the existence of at least three breakpoint clusters of chromosome 2 in benign thyroid tumors or hyperplasias.