B. Inflammation of actinic keratoses
Capecitabine is an orally bioavailable prodrug of fluorouracil that was initially approved by the US Food and Drug Administration for treating breast and colorectal cancer and has since gained additional indications for various solid tumor cancers. After metabolism to active fluorouracil in the target tissue, the drug exhibits a cytotoxic effect through incorporation within the DNA, which is followed by strand breaks, inhibition of RNA synthesis, and inhibition of thymidylate synthase.1,2 There are several cutaneous adverse effects associated with capecitabine, such as palmar-plantar erythrodysesthesia, vitiligo, pruritus, dermatitis, alopecia, onycholysis, and the inflammation of preexisting actinic keratoses (AKs).