Thyroid hormone modulation of X ray-induced in vitro neoplastic transformation

Abstract
The direct oncogenic potential of X-rays was demonstrated by the in vitro neoplastic transformation of mammalian cells in culture, a technique which permits the study of oncogenesis in the absence of host-specific effects. Although several agents are known to modulate in vitro neoplastic transformation by X-rays, little is known of the effects of hormones. The presence of thyroid hormone is necessary for in vitro neoplastic transformation by X-rays in cells of an established mouse fibroblast culture (C3H/10T1/2) and in early-passage diploid hamster embryo cells.