▁were ▁promised ▁a ▁clean ▁bed , ▁three ▁free ▁square ▁me als ▁a ▁day ▁and ▁free ▁medical ▁care ▁if ▁they ▁were ▁found ▁to ▁have ▁pro state ▁cancer . ▁Hudson ' s ▁early ▁experience ▁with ▁seeing ▁patients ▁dying ▁at ▁a ▁t uber cul osis ▁hospital ▁he ▁was ▁working ▁at ▁led ▁him ▁to ▁develop ▁an ▁interest ▁in ▁pro state ▁cancer . ▁His ▁discovery ▁about ▁the ▁lack ▁of ▁information ▁regarding ▁treatment ▁for ▁the ▁disease ▁and ▁medical ▁training ▁for ▁rect al ▁ex ams ▁needed ▁to ▁diagn ose ▁the ▁disease ▁drove ▁him ▁to ▁purs ue ▁research ▁in ▁pro state ▁cancer . ▁ ▁At ▁the ▁beginning ▁of ▁the ▁experiment , ▁Hudson ▁and ▁his ▁colle ague ▁selected ▁ 1 4 1 ▁patients ▁having ▁sympt oms ▁and ▁signs ▁for ▁ur inary ▁obst ruction . ▁However , ▁as ▁the ▁experiment ▁progress ed , ▁patients ▁were ▁selected ▁randomly . ▁They ▁were ▁not ▁informed ▁that ▁the ▁bi ops ies ▁searching ▁for ▁cancer ▁had ▁possible ▁side ▁effects , ▁i . e ., ▁rect al ▁te aring ▁and ▁imp ot ence . ▁According ▁to ▁Robert ▁Ar on ow itz , ▁before ▁the ▁bi ops y , ▁the ▁patients ▁under w ent ▁a ▁physical ▁exam ination ▁including ▁blood ▁and ▁ur ine ▁ass ays , ▁x - ray s ▁of ▁the ▁ab d omen , ▁mass age ▁of ▁the ▁pro state ▁for ▁c yt ology ▁and ▁int ra ven ous ▁py el og rams . ▁For ▁the ▁bi ops y , ▁a ▁part ▁of ▁the ▁pro state ▁meas uring ▁ 2 . 5 ▁× ▁ 1 . 0 ▁×