Abstract Background The most frequent chemotherapeutic regimens used in children's cancer contain anthracyclines, which may have potentially cardiotoxic effects even at a later point in time. Echocardiography including tissue Doppler imaging is well‐proved noninvasive method to assess cardiac function. Objectives To assess the late cardiotoxic effects in young adults treated for various cancer types in childhood. Methods Ninety‐eight young adults who were treated for childhood cancer (CCS), median time 12.1 years after finishing the therapy, were comprised into study. All subjects underwent echocardiographic examination including tissue Doppler imaging. The echocardiographic parameters were compared to 57 healthy age‐matched subjects. The CCS group also underwent 24‐h ECG Holter monitoring to reveal any arrhythmias. Results The subjects in CCS group had lower E′ velocities from lateral (15.6 vs. 17.6 cm/s) and septal part (12.2 vs. 14.4 cm/s) of mitral annulus (p for both