Abstract
The biological effects brought about by the selective accumulation of 35S-labelled methylthionine bromide (MTB) in pigmented hamster melanoma cells were examined in vitro and vivo. In vitro incubation of melanoma cells 35S-carrier-containing medium was found to suppress mitotic activity within 150 h whereas the same concentration before reimplantation into the skin, a clear-out correlation between 35S radioactivity and the capacity of growth initiation could be found. The growth of melanoma in situ could also be delayed by injecting the 35S-carrier to tumour-bearing animals.
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