As PC3 prostate carcinoma cells were devoid of KAI1 expression, Vector-transfected cells (PC3-GFP clone number #8), and KAI1- expressing PC3 clones (clone number #5 and #6) were picked after stable transfection with KAI1 cDNA and selection in 800 μg/ml G418. This evidence concerns the gene CD82 and prostate carcinoma.