CYP26B1 and neoplasm: For CYP26B1 negative tumours (n = 242) the mean survival was 133 months (95%CI = 118–148 months), for CYP26B1 weak expressing tumours (n = 216) the mean survival was 106 months (95%CI = 95–116 months), for CYP26B1 moderate expressing tumours (n = 106) the mean survival was 103 months (95%CI = 85–120 months) and for strongly expressing CYP26B1 tumours (n = 58) the mean survival was 81 months (95%CI = 60–101 months).