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Electrocardiograms (ECGs) 12‐lead during treatment with ribociclib. In September 2019 (prior ribociclib initiation), QTcF (Fridericia's correction formula for prolongation of QT interval) was 406 ms (A); In November 2019 at ER, ECG develops new‐onset arrhythmia with 423 ms QTcF (B)
