▁ 0 . 5 ▁cent im eters ▁was ▁removed ; ▁one ▁half ▁was ▁sent ▁to ▁a ▁path ology ▁labor atory ▁to ▁get ▁tested ▁while ▁the ▁other ▁half ▁was ▁retained ▁for ▁permanent ▁prepar ation . ▁If ▁the ▁results ▁showed ▁cancer , ▁a ▁per ine al ▁pro state ct omy ▁and ▁orch ie ct omy ▁was ▁performed ▁on ▁the ▁men , ▁followed ▁by ▁di eth yl st il best rol ▁treatment . ▁The ▁hom eless ▁were ▁target ed ▁for ▁these ▁bi ops ies ▁because ▁they ▁were ▁pain ful ▁and ▁un test ed , ▁and ▁less ▁vulner able ▁populations ▁would ▁not ▁volunte er . ▁ ▁Background ▁▁ ▁Before ▁se cur ing ▁a ▁lead ▁research ▁position ▁at ▁Columbia ▁University , ▁Hudson ▁received ▁surg ical ▁training ▁in ▁the ▁United ▁States ▁Navy ▁and ▁obtained ▁a ▁research ▁position ▁in ▁u ro log y ▁at ▁Joh ns ▁Hop kins ▁University ▁under ▁William ▁Scott . ▁Over ▁time , ▁Hudson ' s ▁desire ▁to ▁learn ▁more ▁about ▁pro state ▁cancer ▁led ▁him ▁to ▁purs ue ▁a ▁research ▁position ▁at ▁Columbia ▁University ; ▁where ▁he ▁led ▁various ▁research ▁projects ▁and ▁was ▁given ▁ownership ▁of ▁various ▁l abs . ▁In ▁addition ▁to ▁his ▁academic ▁accomplish ments , ▁Hudson ▁was ▁appointed ▁head ▁of ▁u ro log y ▁at ▁Francis ▁Del af ield ▁Hospital . ▁Hudson ' s ▁intent ▁with ▁the ▁Sk id ▁Row ▁cancer ▁experiment ▁was ▁to ▁figure ▁out ▁whether ▁or ▁not ▁pro state ▁cancer ▁was ▁terminal ▁and ▁how ▁soon ▁it ▁could ▁be ▁diagn osed . ▁He ▁continued ▁working ▁in ▁the ▁u ro log ical ▁field