Correlation between Changes of NT-Pro BNP and HS-Troponin I Level with Cardiotoxicity in Locally Advanced Breast Cancer After Three Cycles of Neoadjuvant CAF Chemotherapy

Abstract

Chemotherapy with cyclophosphamide, adriamycin, and fluorouracil (CAF) regiment in patients with locally advanced breast cancer have a risk of cardiotoxicity. Cardiotoxicity examination standards using left ventricular ejection fraction (LVEF) by echocardiography are considered insensitive for detection of subclinical ventricular dysfunction. NT-pro BNP and Hs-Troponin I (hs-TnI) as cardiac biomarkers are expected to help detect early cardiotoxicity. This study intended to analyze the correlation between changes of NT-pro BNP and hs-TnI levels with cardiotoxicity in breast cancer after three cycles of chemotherapy.This was a cross-sectional observational study, conducted at the Dr. Soetomo General Hospital Surabaya. The subjects consisted of 23 breast cancer patients who underwent chemotherapy with CAF regiment. NT-proBNP and hs-TnI examination used CLIA methods (Immulite 1000, ADVIA Centaur TnI-Ultra). Cardiotoxicity based on decreased  LVEF to more than 10% of the initial LVEF value using echocardiography. Significant increases in NT pro BNP and hs-TnI levels were obtained before and after treatment (p=0.000, p=0.002). A significant decrease in LVEF was obtained before and after treatment (p=0.000), but only 2 patients (8.7%) showed cardiotoxicity. There was no correlation between changes in NT-pro BNP and hs-TnI levels with changes in LVEF before and after chemotherapy (p=0.666 and r=0.095; p=0.254 and r=-0.28). There was no correlation between changes in NT-pro BNP and hs-TnI levels with cardiotoxicity, which was assessed based on LVEF reduction, in locally advanced breast cancer after three-cycles of chemotherapy with CAF regiment.