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2014 ; 32
(3
): 518-25
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A phase 1, open-label, dose-escalation study of BIIB022 (anti-IGF-1R monoclonal
antibody) in subjects with relapsed or refractory solid tumors
#MMPMID24458261
von Mehren M
; Britten CD
; Pieslor P
; Saville W
; Vassos A
; Harris S
; Galluppi GR
; Darif M
; Wainberg ZA
; Cohen RB
; Leong S
Invest New Drugs
2014[Jun]; 32
(3
): 518-25
PMID24458261
show ga
PURPOSE: The IGF-1R signaling pathway has been implicated in multiple cancers as
important for cell survival, proliferation, invasion and metastasis. BIIB022 is a
non-glycosylated human IgG4 monoclonal antibody (mAb) with specificity for
IGF-1R. Unlike other anti-IGF1R antibodies, BIIB022 has no effector functions.
Additionally, inhibition is via an allosteric rather than competitive mechanism,
which further differentiates this antibody from others. We sought to determine
the safety and tolerability of BIIB022 and determine the pharmacokinetic (PK) and
pharmacodynamic (PD) profile of this antibody. METHODS: A multi-institutional
phase I study evaluated the safety of escalating doses of BIIB022 given IV q3wk
until progression or unacceptable toxicity in patients with advanced solid
tumors. Five sequential BIIB022 dose cohorts were evaluated using a standard
3?+?3 dose-escalation design (1.5, 5. 10, 20, 30 mg/kg); 10 additional patients
were treated at the recommended phase 2 dose. RESULTS: 34 patients were treated.
Toxicities were manageable and mostly low grade; grade 3-4 hyperglycemia was not
observed. No RECIST responses were observed, although three patients had
metabolic responses associated with prolonged stable disease. The PK of BIIB022
was nearly linear in the dose range from 10 to 30 mg/kg, with some nonlinearity
at lower doses (1.5-5.0 mg/kg), likely due to target-mediated drug disposition of
BIIB022 at low serum concentrations. PD analyses showed decrease in IGF-1R levels
on leucocytes, with stable serum values of IGF-1 and IGF-2. CONCLUSIONS: BIIB022
can be safely given at 30 mg/kg IV every 3 weeks with preliminary evidence of
biological activity in selected patients.