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?????(?) ???????????????????????????34-(benzopyrene);???;?????????????()? ??????A???O???() ???????????????\()?? ??????????????????(precancerous conditions)???(precancerous lesions)1.????(1)???????(2)????10%????510(3)????????????15%40%?2cm?????1%(4)?????10???(5)????????????(6)????(Menetrier)??????????????10%??2.????(1)??????????(anaplasia)??(2)(?)?????(?)?????2?a?????;b???????(?)? ????????????()??1. ??????????(?)?()?()???a(??)b(???)c(??)????c+ac+(?1)?510mm??<5mm? ?1 ???2. ??????????(?2) ?2 ??...