[RESULTS] In logistic regression analyses , there was an intervention effect for willingness to donate : urine if had cancer [ OR , 2.2 ; 95 % confidence interval ( CI ) , 1.3-3 .7 ] , toenails if healthy ( OR , 2.1 ; 95 % CI , 1.4-3 .2 ) or had cancer ( OR , 2.3 ; 95 % CI , 2.0-2 .7 ) , hair if healthy ( OR , 1.8 ; 95 % CI , 1.3-2 .5 ) or had cancer ( OR , 2.8 ; 95 % CI , 1.9-4 .0 ) , and unused cancerous tissue ( OR , 1.8 ; 95 % CI , 1.2-2 .9 ) .