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[89Zr]ZrDFO-CR011 PET Correlates with Response to Glycoprotein Nonmetastatic Melanoma B-targeted Therapy in Triple-negative Breast Cancer.

Authors :
Lee S
Cavaliere A
Gallezot JD
Keler T
Michelhaugh SK
Belitzky E
Liu M
Mulnix T
Maher SE
Bothwell ALM
Li F
Phadke M
Mittal S
Marquez-Nostra B
Source :
Molecular cancer therapeutics [Mol Cancer Ther] 2022 Mar 01; Vol. 21 (3), pp. 440-447.
Publication Year :
2022

Abstract

There is a need for prognostic markers to select patients most likely to benefit from antibody-drug conjugate (ADC) therapy. We quantified the relationship between pretreatment PET imaging of glycoprotein nonmetastatic melanoma B (gpNMB) with 89Zr-labeled anti-gpNMB antibody ([89Zr]ZrDFO-CR011) and response to ADC therapy (CDX-011) in triple-negative breast cancer. First, we compared different PET imaging metrics and found that standardized uptake values (SUV) and tumor-to-heart SUV ratios were sufficient to delineate differences in radiotracer uptake in the tumor of four different cell- and patient-derived tumor models and achieved high standardized effect sizes. These tumor models with varying levels of gpNMB expression were imaged with [89Zr]ZrDFO-CR011 followed by treatment with a single bolus injection of CDX-011. The percent change in tumor volume relative to baseline (% CTV) was then correlated with SUVmean of [89Zr]ZrDFO-CR011 uptake in the tumor. All gpNMB-positive tumor models responded to CDX-011 over 6 weeks of treatment, except one patient-derived tumor regrew after 4 weeks of treatment. As expected, the gpNMB-negative tumor increased in volume by 130 ± 59% at endpoint. The magnitude of pretreatment SUV had the strongest inverse correlation with the % CTV at 2-4 weeks after treatment with CDX-011 (Spearman ρ = -0.8). However, pretreatment PET imaging with [89Zr]ZrDFO-CR011 did not inform on which tumor types will regrow over time. Other methods will be needed to predict resistance to treatment.<br /> (©2022 American Association for Cancer Research.)

Details

Language :
English
ISSN :
1538-8514
Volume :
21
Issue :
3
Database :
MEDLINE
Journal :
Molecular cancer therapeutics
Publication Type :
Academic Journal
Accession number :
35027482
Full Text :
https://doi.org/10.1158/1535-7163.MCT-21-0590