Grade 1: N/A
Grade 2: resting EF 50 to 40%; 10 to 19% drop from baseline
Grade 3: resting EF 39 to 20%; ≥ 20% drop from baseline
Grade 4: resting EF < 20%
Reference: Common Terminology Criteria for Adverse Events (CTCAE) Version 5.0 Published: November 27, 2017
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