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Long-term tumor regression induced by an antibody-drug conjugate that targets 5T4, an oncofetal antigen expressed on tumor-initiating cells.

Abstract：

:Antibody-drug conjugates (ADC) represent a promising therapeutic modality for the clinical management of cancer. We sought to develop a novel ADC that targets 5T4, an oncofetal antigen expressed on tumor-initiating cells (TIC), which comprise the most aggressive cell population in the tumor. We optimized an anti-5T4 ADC (A1mcMMAF) by sulfydryl-based conjugation of the humanized A1 antibody to the tubulin inhibitor monomethylauristatin F (MMAF) via a maleimidocaproyl linker. A1mcMMAF exhibited potent in vivo antitumor activity in a variety of tumor models and induced long-term regressions for up to 100 days after the last dose. Strikingly, animals showed pathologic complete response in each model with doses as low as 3 mg antibody/kg dosed every 4 days. In a non-small cell lung cancer patient-derived xenograft model, in which 5T4 is preferentially expressed on the less differentiated tumor cells, A1mcMMAF treatment resulted in sustained tumor regressions and reduced TIC frequency. These results highlight the potential of ADCs that target the most aggressive cell populations within tumors, such as TICs. In exploratory safety studies, A1mcMMAF exhibited no overt toxicities when administered to cynomolgus monkeys at doses up to 10 mg antibody/kg/cycle × 2 and displayed a half-life of 5 days. The preclinical efficacy and safety data established a promising therapeutic index that supports clinical testing of A1mcMMAF.

journal_name

Mol Cancer Ther

journal_title

Molecular cancer therapeutics

authors

Sapra P,Damelin M,Dijoseph J,Marquette K,Geles KG,Golas J,Dougher M,Narayanan B,Giannakou A,Khandke K,Dushin R,Ernstoff E,Lucas J,Leal M,Hu G,O'Donnell CJ,Tchistiakova L,Abraham RT,Gerber HP

doi

10.1158/1535-7163.MCT-12-0603

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

38-47

issue

1

eissn

1535-7163

issn

1538-8514

pii

1535-7163.MCT-12-0603

journal_volume

12

pub_type

杂志文章

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