Radiation recall phenomenon is an acute inflammatory reaction that develops in previously irradiated areas after administration of inciting agents systemically. The most common agents are anticancer drugs.1 Gemcitabine, a fluorine-substituted deoxycytidine analog, is widely used as a chemotherapy medication. Its antitumor effect results from the blockade of DNA synthesis and DNA repair. It has been used in advanced pancreatic, non–small-cell lung, bladder, and ovarian cancers; soft-tissue sarcoma; and non-Hodgkin lymphoma.2 It has occasionally been reported to cause radiation recall phenomenon.3 The time between radiation and recall may range from weeks to almost a year.
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