to confirm reports that skin cancer can be prevented with retinoids , we conducted a three-year controlled prospective study of oral isotretinoin ( also called 13-cis retinoic acid ) in five patients with xeroderma pigmentosum who had a history of multiple cutaneous basal-cell or squamous-cell carcinomas .
C0035339
retinoids
C0022265
13-cis retinoic acid