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Ref Type Journal Article
PMID (22020316)
Authors Antonarakis ES, Carducci MA, Eisenberger MA, Denmeade SR, Slovin SF, Jelaca-Maxwell K, Vincent ME, Scher HI, Morris MJ
Title Phase I rapid dose-escalation study of AGS-1C4D4, a human anti-PSCA (prostate stem cell antigen) monoclonal antibody, in patients with castration-resistant prostate cancer: a PCCTC trial.
Journal Cancer chemotherapy and pharmacology
Vol 69
Issue 3
Date 2012 Mar
Abstract Text AGS-1C4D4 is a human monoclonal antibody against prostate stem cell antigen (PSCA), a cell-surface protein expressed by most prostate cancers. AGS-1C4D4 is produced in Chinese hamster ovary (CHO) cells and has an identical sequence to AGS-PSCA, an anti-PSCA antibody produced in mouse hybridoma cells that has completed Phase I testing. Preclinical studies demonstrated comparability of AGS-1C4D4 to AGS-PSCA with respect to pharmacokinetics (PK) and tumor inhibition. However, because of differences in antibody-dependent cellular cytotoxicity between AGS-PSCA and AGS-1C4D4, a limited Phase I trial using AGS-1C4D4 was performed evaluating safety and PK.Thirteen patients with metastatic castration-resistant prostate cancer were enrolled. AGS-1C4D4 was administered intravenously every 3 weeks for four planned doses at 6, 12, 24, or 48 mg/kg. Primary endpoints were safety and PK. Secondary endpoints were immunogenicity and clinical activity. Disease assessments were conducted every 12 weeks and included radiographic and PSA evaluations. Patients with stable disease could receive extended treatment beyond four infusions.Adverse events were primarily grade 1-2, without any grade 3-4 drug-related toxicities or infusion reactions. Anti-AGS-1C4D4 antibodies were not detected. Similar to AGS-PSCA, serum AGS-1C4D4 concentrations declined biphasically and elimination was characterized by slow clearance (CL) and a long terminal half-life (t (1/2)). Median CL for the four dose levels ranged from 0.10 to 0.14 ml/h kg, and t (1/2) ranged from 2.2 to 2.9 weeks. No PSA reductions ≥50% were observed. Six patients (46%) had radiographically stable disease, lasting a median of 24 weeks.AGS-1C4D4 was well-tolerated and demonstrated linear PK. Despite preclinical differences in antibody-dependent cellular cytotoxicity, AGS-1C4D4 and AGS-PSCA have similar safety and PK profiles. The recommended Phase II dose is 48 mg/kg.


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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
AGS-1C4D4 MK4721 AGS-1C4D4 (MK4721) is a human monoclonal antibody against prostate stem cell antigen (PSCA), which may result in anti-tumor activity (PMID: 22020316, PMID: 23448807).
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
Unknown unknown prostate cancer not applicable AGS-1C4D4 Phase I Actionable In a Phase I trial, AGS-1C4D4 treatment in castration resistant prostate cancer patients was well-tolerated and resulted in stable disease at 24 weeks in 46% (6/13) of patients, but did not reduce PSA (PMID: 22020316). 22020316