ocr: Site Eligibility for Trial Treatment Outcome All sites Physicians over age 45 B-Carotene (50 mg) on No eftect, including lung cancer in smokers alternate days Squamous cell cancer Prior skin cancers B-Carotene (30 mg) No ditterence from control arm ofs skin38 Squamous cell cancer Prior skin cancers 13-c1s-retinoic acid (10 mg) No ditference from control arm ofskin" Retinol (25,000 IU) Squamous cell cancer Prior actinic keratoses Retinol (25,000 IU) 25% decrease in second squamous skin cancers of: skin40 Lung cancer*o Male heavy smokers ATBC trial Increased lung cancer incidence (18%)ande overa ...
