1 An attempt was made to produce a model of osteogenic sarcoma using 32P transplacentally.
2 Fetal tissues appeared to be resistant to irradiation as no tumour was induced at an increased frequency in treated animals.
3 Tumours that normally occur in our strain (Sprague-Dawley rats) showed a clear tendancy to occur earlier in post-natal life in treated animals compared with controls.
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