Vasoformative non-osteogenic (angio) sarcomas of bone-marrow stroma due to strontium-90.

In a series of experiments, mainly CBA/H, but also C2H/H, mice aged 3 months were injected intraperitoneally with solutions of 90Sr Cl2, the dose per mouse varying from 7 to 20 muCi, and compared with similar mice treated with 226Ra or 239Pu, discussed elsewhere. In male mice, the commonest tumour resulting at each dose of 90Sr was non-osteogenic (angio) sarcoma, a tumour not seen after 226Ra. In females, this tumour occurred far less frequently than osteosarcoma. In CBA mice of both sexes converted to radiation chimaeras (which are sterile) and similarly treated with 90Sr, the only skeletal tumours were osteosarcomas. When only half the body of CBA mice was X-irradiated with 1000 rad and the mice given 90Sr, non-osteogenic sarcoma occurred predominantly in those mice X-irradiated in the cephalic half. The results suggest that intact testes may provide co-factors for this type of neoplasm, whereas others have shown that oestrogens facilitate murine osteosarcoma. The non-osteogenic osteosarcomas arise from damaged stromal elements in bone-marrow of selected bones. The risk to this component of bone-marrow, as well as to haematopoietic tissue, should be considered in radiation protection.