1 7 7 Lu - D OT AT ATE ▁or ▁ 9 0 Y - D OT AT OC , ▁the ▁most ▁widely ▁used ▁PR RT ▁dru gs . ▁When ▁it ▁comes ▁to ▁comparing ▁these ▁two ▁PR RT , ▁Y - l abeled ▁and ▁Lu - l abeled ▁PR RT s , ▁it ▁appears ▁that ▁Y - l abeled ▁is ▁more ▁effective ▁for ▁larger ▁tum ors , ▁while ▁Lu - l abeled ▁is ▁better ▁for ▁smaller ▁and ▁primary ▁tum ors . ▁The ▁lack ▁of ▁ <0xC9> <0xA4> - em ission ▁with ▁Y - l abeled ▁P PR T s ▁is ▁also ▁an ▁important ▁difference ▁between ▁Lu ▁pe pt ides ▁and ▁Y ▁pe pt ide . ▁In ▁particular , ▁with ▁Y - l abeled ▁PR RT ▁it ▁becomes ▁difficult ▁to ▁set ▁up ▁a ▁do se ▁of ▁radi ations ▁specific ▁to ▁the ▁patient ' s ▁needs . ▁In ▁most ▁cases ▁PR RT ▁is ▁used ▁for ▁can cers ▁of ▁the ▁g astro enter op an cre atic ▁and ▁bron ch ial ▁tract s , ▁and ▁in ▁some ▁cases ▁ph ae och rom oc yt oma , ▁par ag ang li oma , ▁ne uro blast oma ▁or ▁med ull ary ▁thy roid ▁car cin oma . ▁Vari ous ▁approaches ▁to ▁appro ve ▁effect iveness ▁and ▁limit ▁side ▁effects ▁are ▁being ▁investig ated , ▁including ▁rad ios ens it ising ▁dru gs , ▁fraction ation ▁reg imes ▁and ▁new ▁rad ion u cl ides . ▁Al pha ▁emit ters , ▁which ▁have ▁much ▁shorter ▁ranges ▁in ▁t