Abstract
The cytogenetic study of 18 near-diploid colorectal tumors shows that the observed numerical and structural abnormalities resulted in recurrent chromosomal losses and gains. By order of decreasing frequencies, they are: monosomy 17p ( 16 18 ), partial or more frequently complete monosomy 18 ( 14 18 ), trisomy 20q ( 11 18 ), trisomy or tetrasomy 13 ( 10 18 ), monosomy lp and trisomies X and 8q ( 9 18 ). The absence of recurrent breakpoints in euchromatin contrasts with the high preponderance of breakage at various places of heterochromatic region. Because these tumors are characterized by very recurrent chromosomal imbalances, it is assumed that the observed chromosomal changes may be related to a recessive genetic determinism and to gene dosage imbalances.
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