Cardiotoxicity after anthracycline chemotherapy in breast carcinoma: effects on left ventricular ejection fraction, troponin I and brain natriuretic peptide.

UNLABELLED: Anthracyclines are among the most active drugs in breast cancer patients. We planned to evaluate the early and 2-year modification of left ventricular ejection fraction (LVEF) and the effects of chemotherapy on troponin I and neurohormonal assessment.
METHODS: Patients with early breast cancer surgically treated and eligible to adjuvant chemotherapy were enrolled. All patients underwent clinical assessment, radionuclide ventriculography, troponin I and brain natriuretic peptide (BNP) measurements at baseline and one-month (T1), one year (T2) and 2-year (T3) after chemotherapy. Reductions of LVEF ≥ 10% or an overt heart failure were considered cardiovascular events.
RESULTS: 53 patients, 52 females and 1 male, age 55.3 years were included and followed at T3. A significant reduction of LVEF was observed (from 62 ± 5.5% to 59.3 ± 8.6%, p=0.04) at T3; BNP increased (from 33.4 ± 41.5 pg/ml to 62.7 ± 94.7 pg/ml, p=0.005) at T1. Troponin I augmented at T1 (from 0.006 ± 0.01 ng/ml to 0.05 ± 0.04 ng/ml, p=0.0001) but normalized at T2 (0.005 ± 0.08 ng/ml; p=0.9). Only baseline BNP was nearly to be significantly correlated with T3 LVEF (p=0.07 HR 0.96-1) at multivariate analysis. In 13/53 patients (32.1%) LVEF showed ≥ 10% reduction at T3 (group A); in 40/53 patients (67.9%) LVEF was unchanged (group B). Patients in group A demonstrated higher baseline plasma BNP (p=0.02) and lower haemoglobin concentration (p=0.007) compared to patients in group B.
CONCLUSIONS: LVEF and BNP modified early after anthracycline chemotherapy and LVEF did not recover at T3. In patients who developed left ventricular systolic dysfunction, a subclinical activation of neurohormonal profile was observed.