25P - Ranolazine partially blunts ado trastuzumab emtansine related cardiotoxicity

Date 10 October 2016
Event ESMO 2016 Congress
Session Poster display
Topics Cancer biology
Basic Scientific Principles
Presenter Nicola Maurea
Citation Annals of Oncology (2016) 27 (6): 1-14. 10.1093/annonc/mdw362
Authors N. Maurea1, C. Coppola1, G. Piscopo1, G. Riccio1, A. Rienzo1, C. Maurea1, A. Barbieri2, C. De Lorenzo3, R.V. Iaffaioli4
  • 1Cardiology, Istituto Nazionale Tumori – I.R.C.C.S - Fondazione Pascale, 80131 - Napoli/IT
  • 2Animal Facility, Istituto Nazionale Tumori – I.R.C.C.S - Fondazione Pascale, 80131 - Napoli/IT
  • 3Department Of Molecular Medicine And Medical Biotechnology, University ‘Federico II’, Napoli/IT
  • 4Abdominal Oncology, Istituto Nazionale Tumori – I.R.C.C.S - Fondazione Pascale, 80131 - Napoli/IT

Abstract

Background

Ado trastuzumab emtansine (TDM1) is a novel antibody–drug conjugate consisting of trastuzumab (TRAS) covalently linked to the highly potent microtubule inhibitory agent DM1 via a stable thioether linker. TDM1 is used in metastatic ErbB2 positive breast cancer patients. Although, the potential cardiotoxic effects of TDM1 have not yet been fully elucidated, they can include all the mechanisms of TRAS-related cardiotoxicity, such as changes in Ca2+ regulation. Here, we aim to elucidate whether Ranolazine (RAN), administered after TDM1 treatment, blunts or not cardiotoxicity in vivo and in vitro.

Methods

In vitro, human fetal cardiomyocytes (HFC) were treated with TDM1 for 3 days and then treated in the absence or presence of RAN for 3 days. Cell viability was assessed by cell counting and MTT assay. To evaluate cardiac function in vivo, C57/BL6 mice, 2-4 months old, were daily treated with TDM1 (44.4 mg/kg/day). At day 0 and after 7 days, fractional shortening (FS) and ejection fraction (EF) were measured, by M/B mode echocardiography, and radial and longitudinal strain (RS and LS) were evaluated using 2D speckle-stracking. These measurements were repeated after 5 days of RAN treatment (305 mg/Kg/day), started at the end of TDM1 treatment.

Results

RAN reduces TDM1 toxicity in HFC, as evidenced by the higher percentage of viable cells treated with TDM1+ RAN with respect to the cells treated with TDM1 alone (p 

Conclusions

Here we show that in vivo RAN post-treatment reduces cardiotoxic effects due to TDM1, as demonstrated by the recovery of FS, EF and LS values. As expected, RAN increases cell viability of HFC treated with TDM1.

Clinical trial identification

Legal entity responsible for the study

N/A

Funding

Fondi di Ricerca Corrente destinati all' Istituto Nazionale Tumori Pascale - Napoli

Disclosure

All authors have declared no conflicts of interest.