28 THE BIOCHEMISTRY OF B VITAMINS 



viz., riboflavin, biotin and pyridoxine,* were found to be proportionately 

 much lower than in other tissues, and inositol and folic acid* were rela- 

 tively abundant. These findings arc interesting in that both inositol and 

 folic acid have been found to be effective in causing regression of cancer 

 when injected intravenously into mice.' 1 "' 



Unfortunately neither the studies of the content of B vitamins nor 

 extensive enzyme studies have been extended to cover fowl tumors which 

 are known to be virus-induced. If these tumors should be found to follow 

 the same pattern, this will constitute further circumstantial evidence that 

 mammalian tumors are also induced by viruses. 



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* The values for pyridoxine and folic acid in the publication under discussion 16 

 are of comparative value only, since the release of these vitamins could not be 

 accomplished in a quantitative manner at the time the investigation was carried out. 



