Chronic cardiotoxicity could be early or late. Early-onset cardiotoxicity occurs within 1 year after anthracycline treatment and late-onset cardiotoxicity occurs more than 1 year after completion of anthracycline treatment. In the latter two, cardiotoxicity is associated with the lesion of cardiomyocytes and is therefore considered irreversible. The incidence of cardiotoxicity varies among different studies, depending on patient follow-up or the definition of cardiotoxicity used (acute, subacute or late).