“Increased numbers of tumors per lung were also found when the interval between urethan injection and the first BHT treatment was extended up to 6 weeks.”
“Repeated treatment with BHT, followed by urethan, had no effect and concomitant administration of urethan and BHT reduced the number of tumors found.”
“When urethan was followed by weekly ip administrations of butylated hydroxytoluene (BHT), the number of tumors per lung found 14 to 24 weeks after urethan was increased.”