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J Immunother 2005 Jul-Aug;28(4):376-81

Phase I trial of intravenous IL-4 pseudomonas exotoxin protein (NBI-3001) in patients with advanced solid tumors that express the IL-4 receptor.

Garland L, Gitlitz B, Ebbinghaus S, Pan H, de Haan H, Puri RK, Von Hoff D, Figlin R

Garland L, Univ Arizona, Arizona Canc Ctr, 1515 N Campbell Ave,Ste 1969E, Tucson, AZ 85724 USA Univ Arizona, Arizona Canc Ctr, Tucson, AZ 85724 USA Univ So Calif, Kenneth Norris Jr Comprehens Canc Ctr, Los Angeles, CA 90033 USA Neurocrine Biosci Inc, San Diego, CA USA US FDA, Ctr Biol Evaluat & Res, Div Cellular & Gene Therapies, Lab Mol Tumor Biol,NIH, Bethesda, MD 20014 USA Univ Calif Los Angeles, Jonsson Comprehens Canc Ctr, Los Angeles, CA 90024 USA


NBI-3001 is a novel immunotoxin of attenuated Pseudomonas exotoxin fused to circularly permutated IL-4, which has shown some antitumor effects in glioblastoma multiforme with intratumoral administration. The authors evaluated the safety and tolerability of NBI-3001 administered intravenously in a dose-escalation design to patients with renal cell and non-small cell lung carcinoma whose tumors showed at least 10% IL-4 receptor expression. Cohorts of three to six patients were treated at dose levels of 0.008, 0.016, and 0.027 mg/m2 daily x 5 days every 28 days. Neutralizing antibody (NAB) titers, plasma levels of NBI-3001, and patient tolerability were monitored sequentially. 14 patients received a total of 36 cycles of NBI-3001 (range 1-6). No dose-limiting toxicities were noted at dose levels 0.008 and 0.016 mg/m2. At 0.027 mg/m2, two patients developed self-limiting, grade 3 or 4 transaminase elevation during cycle 1. NAB titers of more than 1:100 were detected in five of the seven patients treated with at least two cycles; the median titer after cycle 1 and the median maximum titer in subsequent cycles were 1:50 and approximately 1:1,710, respectively. No objective tumor responses were noted. Eight of 12 evaluable patients with renal cell carcinoma had stable disease; four patients had disease progression. High NAB titers resulted in four patients being withdrawn from the study. The dose-limiting toxicity for intravenous NBI-3001 was transaminase elevation at 0.027 mg/m2. NBI-3001 at 0.016 mg/m2 was well tolerated. Low circulating levels of NBI-3001, coupled with rising NAB titers, may have contributed to the lack of response in tumors that express IL-4R.

Category: Journal Article
PubMed ID: #16000956
Includes FDA Authors from Scientific Area(s): Biologics
Entry Created: 2011-10-04 Entry Last Modified: 2012-08-29