Trisomy 7 in nonneoplastic cells

Abstract excerpt

Abstract The somatic mutation theory of tumorigenesis states that mutations are necessary for tumor development. On the other hand, acquired, clonal chromosomal alterations are occasionally detected in otherwise normal, nonneoplastic cells—for example, loss of sex chromosomes occurs in bone marrow cells and lymphocytes in elderly individuals—and it is therefore evident that not all mutations are by themselves...

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