Statistics from Altmetric.com
T-VEC is a herpes simplex virus type-1-derived oncolytic immunotherapy designed to produce GM-CSF and to selectively replicate in and lyse tumors to induce a systemic anti-tumor immune response. A phase 3 study of T-VEC in Stage IIIB-IV melanoma demonstrated a significant improvement in ≥ 6 mo durable response rate vs GM-CSF and a tolerable safety profile.
In this 2-part study (NCT01740297), phase 1b evaluated the safety of T-VEC in combination with ipi as assessed by the incidence of dose-limiting toxicities (DLTs) at full doses of both agents. For 6 to 9 patients (pts) evaluable for DLT, approximately 18 pts were to be enrolled in phase 1b. DLTs were defined as any grade (gr) ≥ 3 immune-related adverse event (AE) or gr ≥ 4 AE of any etiology occurring between the first dose of ipi and 6 wks after. The incidence of DLTs was required to be ≤ 1 of the first 6 evaluable pts or ≤ 2 of the first 9 evaluable pts (if 2 DLTs were seen in the first 6 pts). Key entry criteria were previously untreated, unresectable Stage IIIB-IV melanoma, ECOG 0-1, measurable disease, and ≥ 1 injectable cutaneous, subcutaneous, or nodal tumor. T-VEC was administered by intralesional injection at ≤ 4 mL of 106 plaque forming units (PFU)/mL for the first dose, then 108 PFU/mL on day 1 of wk 4 and thereafter. Ipi 3 mg/kg q3w was administered as 4 infusions starting at wk 6. Pts received T-VEC until development of DLT, all injectable tumors have disappeared, disease progression per the Immune Related Response Criteria, or treatment intolerance. Phase 2 will evaluate the safety and efficacy of ipi vs T-VEC+ipi in a randomized fashion.
To date, 19 pts have enrolled (13 pts received ≥ 1 dose of T-VEC); 9 pts are evaluable for DLT. All DLT evaluable pts received at least 4 doses of T-VEC and 2 doses of ipi by the time of DLT cutoff (6 wks post first ipi dose). No DLTs were observed in evaluable pts. Serious AEs were reported in 1 of 19 pts to date (gr 3 nausea and abdominal distention in week 11 of treatment). Two partial responses were reported by wk 12 in the 9 DLT evaluable pts. Data will be updated at the meeting.
Advancement into the randomized phase 2 is planned pending Data Review Team recommendations.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.