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AN examination of the effects of several chemically unrelated carcinogens upon the sulphydryl (-SH) levels of various susceptible and non-susceptible tissues led to the question of an increase in -SH levels being an essential feature oftumour induction (Calcutt, Doxey and Coates, 1960). This is an obviously important issue and so further evidence has been sought. A series of different chemical carcinogens has been tested as previously and the detailed findings are given below.

Further Studies of the Effects of Chemical Carcinogens Upon The -Sh Levels of Target and Non-Target Tissues