Sacubitril-Valsartan and Prevention of Cardiac Dysfunction During Adjuvant Breast Cancer Therapy: The PRADA II Randomized Clinical Trial.

Background: Anthracycline- and trastuzumab-associated cardiotoxicity may lead to cardiac dysfunction and dose reduction or halt in potentially life-saving adjuvant cancer therapy. Whether angiotensin receptor neprilysin inhibitors can prevent cancer therapy-related cardiac dysfunction and injury remains to be established.

Methods: PRADA II was a randomized, parallel-group, placebo-controlled, double-blind multicenter trial conducted at 4 academic medical centers in Norway that evaluated the cardioprotective effect of sacubitril-valsartan vs. placebo administered concomitantly with anthracycline-containing breast cancer therapy and continued for 18 months. The target dose was 97/103 mg b.i.d. The primary outcome was change in left ventricular ejection fraction by cardiovascular magnetic resonance from prior to initiation of chemotherapy to 18 months after. Secondary outcomes included change in echocardiographic global longitudinal strain, circulating cardiac troponins, and N-terminal pro-B-type natriuretic peptide (NT-proBNP).

Results: In total, 138 women (mean (±SD) age: 54.0 ± 9.4 years) were randomized. The overall decline in left ventricular ejection fraction from baseline to 18 months was 2.2 percentage points (95% confidence interval [CI], 1.1 to 3.3) in the placebo group and 1.1 percentage points (95% CI, -0.01 to 2.2) in the sacubitril-valsartan group. The between-group difference was 1.1 percentage points (95% CI, -0.4 to 2.7; P=0.16). Left ventricular global longitudinal strain was normal and remained stable in the sacubitril-valsartan group throughout the study (change from baseline to 18 months -0.32 [95% CI, -0.80 to 0.15]). In contrast, there was a progressive decline in the placebo group (change from baseline to 18 months 0.53 [95% CI, 0.05 to 1.00]). The between-group difference was -0.85 (95% CI, -1.52 to -0.18). The mean increases in NT-proBNP and cardiac troponin I concentrations from baseline to 18 months were greater in the placebo than in the sacubitril-valsartan group (log difference 0.303 (95% CI 0.0547 to 0.552) for NT-proBNP and 0.534 (95% CI 0.114 to 0.954) for cardiac troponin I).

Conclusions: Anthracycline-based treatment for early breast cancer is associated with a reduction in left ventricular ejection fraction that was not significantly attenuated by sacubitril-valsartan.