Early therapy assessment of combined anti-DR5 antibody and carboplatin in triple-negative breast cancer xenografts in mice using diffusion-weighted imaging and (1)H MR spectroscopy.

Academic Article

Abstract

  • PURPOSE: To assess the early response of triple-negative breast-cancer (TNBC) following TRA-8 and carboplatin therapy using DWI and MRS in 2LMP and SUM159 mouse models. MATERIALS AND METHODS: Four groups (n = 5/group) of each model were untreated or treated with carboplatin, TRA-8, and combination, respectively. DWI and MRS were applied on 0, 3, and 7 days after therapy initiation, and all tumors were collected thereafter for terminal deoxynucleotidyl transferase mediated dUTP nick end labeling (TUNEL) staining. The changes in intratumoral apparent diffusion coefficient (ADC) and fat-water ratios (FWRs) were compared with tumor volume changes and apoptotic cell densities. RESULTS: Mean ADC values of 2LMP and SUM159 tumors significantly increased 4 ± 4% and 37 ± 11% during 7 days of combination therapy, respectively, as compared to control groups (P < 0.05). Similarly, mean FWRs of 2LMP and SUM159 tumors significantly increased 102 ± 30% and 126 ± 52%, respectively, for 7 days of combined treatment (P < 0.05). The changes of the mean ADC values for 3 days (or FWRs for 7 days) were linearly proportional to either the mean volume changes or apoptotic cell densities in both models. CONCLUSION: DWI and MRS assessed the early tumor response to TRA-8 and carboplatin in TNBC mouse models.
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    Keywords

  • DWI, MRS, TRA-8, carboplatin, triple-negative breast cancer, Analysis of Variance, Animals, Antibodies, Monoclonal, Antineoplastic Agents, Carboplatin, Cell Line, Tumor, Combined Modality Therapy, Diffusion Magnetic Resonance Imaging, Disease Models, Animal, Female, Heterografts, Humans, Magnetic Resonance Spectroscopy, Mammary Neoplasms, Experimental, Mice, Mice, Nude, Receptors, TNF-Related Apoptosis-Inducing Ligand, Transplantation, Heterologous, Treatment Outcome, Triple Negative Breast Neoplasms
  • Digital Object Identifier (doi)

    Author List

  • Zhai G; Kim H; Sarver D; Samuel S; Whitworth L; Umphrey H; Oelschlager DK; Beasley TM; Zinn KR
  • Start Page

  • 1588
  • End Page

  • 1594
  • Volume

  • 39
  • Issue

  • 6