Anti-glypican-1 antibody-drug conjugate exhibits potent preclinical antitumor activity against glypican-1 positive uterine cervical cancer

Matsuzaki, S; Serada, S; Hiramatsu, K; Nojima, S; Matsuzaki, S; Ueda, Y; Ohkawara, T; Mabuchi, S; Fujimoto, M; Morii, E; Yoshino, K; Kimura, T; Naka, T

Yoshino, K (reprint author), Osaka Univ, Grad Sch Med, Dept Obstet & Gynecol, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan.; Serada, S (reprint author), Kochi Univ, Ctr Intractable Immune Dis, Kochi Med Sch, Nankoku, Kochi 7838505, Japan.

INTERNATIONAL JOURNAL OF CANCER, 2018; 142 (5): 1056

Abstract

Glypican-1 (GPC1) is highly expressed in solid tumors, especially squamous cell carcinomas (SCCs), and is thought to be associated with disease progression. We explored the use of a GPC1-targeted antibody-drug conjugate (ADC) as a novel treatment for uterine cervical cancer. On immunohistochemical staining, high expression levels of GPC1 were detected in about 50% of uterine cervical cancer tissues and also in a tumor that had relapsed after chemoradiotherapy. Novel anti-GPC1 monoclonal antibodies were developed, and clone 01a033 was selected as the best antibody for targeted delivery of the cytotoxic agent monomethyl auristatin F (MMAF) into GPC1-positive cells. The anti-GPC1 antibody was conjugated with MMAF. On flow cytometry, HeLa and ME180 cervical cancer cells highly expressed GPC1, however, RMG-I ovarian clear cell cancer cell line showed weak expression. The GPC1-ADC was rapidly internalized into GPC1-expressing cells in vitro and was potently cytotoxic to cancer cells highly expressing GPC1. There were no inhibitory effects on cancer cells with low expression of GPC1. In a murine xenograft model, GPC1-ADC also had significant and potent tumor growth inhibition. GPC1-ADC-mediated G2/M phase cell cycle arrest was detected, indicating that the dominant antitumor effect in vivo was MMAF-mediated. The toxicity of GPC-ADC was tolerable within the therapeutic dose range in mice. Our data showed that GPC1-ADC has potential as a promising therapy for uterine cervical cancer.

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