TNNI3 and Arrhythmia: Children in two cohorts had similar distributions of sex (P = 0.5564), age (P = 0.8437), type of malignancy (P = 0.7858), type of anthracycline (P = 0.4821), cumulative anthracycline dose (P = 0.9016), pericardial effusion (P = 0.6642), EF (P = 0.4252), cTnI (0.358), NT-proBNP (P = 0.7742), arrhythmia (P = 0.3218), and diastolic dysfunction (P = 0.8583).