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Invest New Drugs. 2014 Dec;32(6):1246-57. doi: 10.1007/s10637-014-0151-0. Epub 2014 Aug 22.

Phase I dose-escalation study of SGN-75 in patients with CD70-positive relapsed/refractory non-Hodgkin lymphoma or metastatic renal cell carcinoma.

Author information

1
MD, FACP; MD Anderson Cancer Center, Department of Genitourinary Medical Oncology, 1155 Pressler St, Unit 1374, Houston, TX, 77030, USA, ntannir@mdanderson.org.

Abstract

PURPOSE:

This first-in-human study evaluated the CD70-targeted antibody-drug conjugate SGN-75 in patients with relapsed or refractory CD70-positive non-Hodgkin lymphoma (NHL) or metastatic renal cell carcinoma (RCC). Methods SGN-75 was administered intravenously to 58 patients (39 RCC, 19 NHL) every 3 weeks (Q3Wk; doses escalated from 0.3 to 4.5 mg/kg) or on Days 1, 8, and 15 of 28-day cycles (weekly; doses of 0.3 or 0.6 mg/kg). Dose-limiting toxicities were evaluated during Cycle 1; treatment response was monitored every 2 cycles.

RESULTS:

The maximum tolerated dose of SGN-75 in RCC patients was 3 mg/kg Q3Wk. Due to toxicity concerns (idiopathic thrombocytopenic purpura in 2 NHL patients treated weekly), dose escalation in the weekly schedule was terminated; no regimen was recommended for NHL patients. The most common adverse events reported in patients treated Q3Wk (N = 47) were fatigue (40%), dry eye (32%), nausea (30%), and thrombocytopenia (26%). The nadir for thrombocytopenia typically occurred during Cycle 1. Ocular adverse events (e.g., corneal epitheliopathy, dry eye) were reported for 57% of patients treated Q3Wk and were generally reversible. Antitumor activity in patients treated Q3Wk included 1 complete response, 2 partial responses, and 20 stable disease. SGN-75 exposures were approximately dose proportional, with a mean terminal half-life of 10 days. Substantial depletions of CD70-positive peripheral blood lymphocytes were observed after SGN-75 treatment.

CONCLUSIONS:

Modest single-agent activity and generally manageable adverse events were observed in heavily pretreated RCC and NHL patients. Administration Q3Wk was better tolerated than weekly dosing. Targeted ablation of CD70-positive lymphocytes was demonstrated.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT01015911.

PMID:
25142258
DOI:
10.1007/s10637-014-0151-0
[Indexed for MEDLINE]

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