Reference Detail

Ref Type Journal Article
PMID (25900182)
Authors Dasari A, Phan A, Gupta S, Rashid A, Yeung SC, Hess K, Chen H, Tarco E, Chen H, Wei C, Anh-Do K, Halperin D, Meric-Bernstam F, Yao J
Title Phase I study of the anti-IGF1R antibody cixutumumab with everolimus and octreotide in advanced well-differentiated neuroendocrine tumors.
Journal Endocrine-related cancer
Vol 22
Issue 3
Date 2015 Jun
URL
Abstract Text Preclinical data suggest multiple roles for the IGF1 receptor (IGF1R) in neuroendocrine tumors (NETs), including mediating resistance to mammalian target of rapamycin (mTOR) inhibitors. Everolimus, an oral mTOR inhibitor, and octreotide long-acting repeatable (LAR) are approved for subgroups of well-differentiated NET. The primary objective of the present study was to establish the safety and recommended phase II dose (RP2D) of cixutumumab, a monoclonal antibody (MAB) against IGF1R, with everolimus and octreotide LAR. Patients with well-differentiated NET were treated with 10  mg everolimus p.o. daily, 20  mg octreotide LAR i.m. every 21 days, and escalating doses of cixutumumab. An expansion cohort was enrolled at RP2D. Correlative studies included the evaluation of mTOR pathway inhibition in paired tumor biopsies and the effects of this combination on metabolism via indirect calorimetry. Nineteen patients with progressive disease were enrolled, including nine to the expansion portion. Two patients had dose-limiting toxicities of grade 3 mucositis at 15  mg/kg cixutumumab. Long-term tolerance at RP2D was problematic, and the most common ≥grade 3 adverse event was fatigue. One patient with metastatic insulinoma had a confirmed partial response, whereas 17 had stable disease. The median progression-free survival was 43.6 weeks, and the median overall survival was 25.5 months. The RP2D of this combination per the predefined study protocol of 10  mg/kg cixutumumab i.v., 20  mg octreotide LAR i.m. every 21 days plus 10  mg everolimus p.o. daily is associated with non-dose-limiting toxicities that limit long-term tolerance. Although a signal of activity was noted in the present study, this will need to be reconciled with limited tolerance of the combination and data from larger studies of anti-IGF1R MABs in NET that have been disappointing.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Therapy Description
Drug Name Trade Name Synonyms Drug Classes Drug Description
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 neuroendocrine tumor not applicable Octreotide acetate + Cixutumumab + Everolimus Phase I Actionable In a Phase I trial, patients with neuroendocrine tumors treated with the combination of Cixutumumab, Sandostatin Lar Depot (octreotide acetate), and Afinitor (everolimus) demonstrated some efficacy, however, the drug combination did result in multiple non-dose limiting toxicities preventing long term tolerance (PMID: 25900182). 25900182