Association of in vitro radiosensitivity and cancer in a family with acute myelogenous leukemia.
The gamma-ray sensitivity of skin fibroblasts from six members of a cancer family was investigated using a colony-forming assay. Fibroblasts from the three members with cancer (two sisters with acute myelogenous leukemia and the mother with cervical carcinoma) showed a significant (p less than 0.05) increase in radiosensitivity, while three members without cancer (the father and two sons) showed a normal radioresponse. The possibility that the increased gamma-ray sensitivity was due to defective DNA repair was investigated using assays for DNA repair replication, single-strand break rejoining, and removal of enzyme-sensitive sites in gamma-irradiated DNA. Results of these assays indicate that the kinetics of enzymatic repair of radiogenic DNA damage in general, and the rejoining of single-strand scissions and excision repair of base and sugar radioproducts in particular, were the same in the cell lines from the sensitive and clinically normal family members.
D000328:Adult; D002460:Cell Line; D002470:Cell Survival; D002648:Child; D002675:Child, Preschool; D004260:DNA Repair; D004307:Dose-Response Relationship, Radiation; D005260:Female; D006801:Humans; D015470:Leukemia, Myeloid, Acute / Q000235:genetics* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D010375:Pedigree; D011836:Radiation Tolerance; D012737:Sex Factors; D012867:Skin