Background: Side effects of chemotherapy in cancer patients need to be investigated in more detail.
Aim: To determine the incidence of cardiotoxicity in patients treated with different chemotherapy regimens containing 5-fluorouracil (5-FU) in Zanjan, Iran.
Patients And Methods: In a prospective cohort study, patients with different types of solid gastrointestinal tumors who were candidates for 5-FU based chemotherapy regimens were enrolled.