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BRAF and MEKis have revolutionized the management of BRAF V600 -mutated melanoma patients. Left ventricular ejection fraction decrease (LVEF-D) related to these treatments has not been thoroughly evaluated to date. The main objective of this study was to describe characteristics of LVEF-D in melanoma patients treated with BRAF and/or MEKis. Metastatic melanoma patients treated with BRAF and/ or MEKis between March 1, 2012 and May 18, 2018 were included retrospectively (Lyon Sud University Hospital, Hospices Civils de Lyon). LVEF-D was defined as a reduction in LVEF ≥10% from baseline to a value <55%; normalization was defined as a value ≥55%. Among the 88 patients included, 12 (13.6%) experienced a LVEF-D, including 10 grade 2 and 2 grade 3. The median onset of which was 11 months (IQR [3-21]). No patient previously treated with beta-blockers (n = 12) experienced a LVEF-D. Analysis of laboratory parameters, electrocardiogram, and transthoracic echocardiography during the follow-up did not find any predictive marker of LVEF-D. All patients who benefited from a specific treatment of LVEF-D had a normalization of LVEF at the end of follow-up. LVEF recovery was significantly better for patients treated with angiotensin converting enzyme inhibitors and beta-blockers than those who did not (P = .019). Ophthalmological adverse events were significantly more frequent in patients who experienced a LVEF-D (P = .006) and the latter did not influence overall-survival (P = .117) or progression-free-survival (P = .297). LVEF-D is a common and easily manageable adverse event due to BRAF and MEKis. Its association with ocular toxicity suggests a close ophthalmological monitoring when LVEF-D occurs. K E Y W O R D Sadverse events, BRAF inhibitor, cardiac toxicity, heart failure, left ventricular ejection fraction, left ventricular systolic dysfunction, MEK inhibitor, metastatic melanoma 2612 | BERGER Et al.

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