The TNT protocol: A phase II study using talimogene laherparepvec (TVEC), nivolumab (N) and trabectedin (T) as first, second/third line therapy for advanced sarcoma, including desmoid tumor and chordoma.

Abstract

TPS11572 Background: Talimogene laherparepvec (TVEC), an oncolytic HSV expressing huGMCSF, may be synergistic with trabectedin (T) and nivolumab (N) in treating advanced sarcoma. Objectives: (1) To evaluate the best overall response by RECIST v1.1, progression-free survival rate (PFS), and overall survival rate, (2) To determine the incidence of conversion of an unresectable tumor to a resectable one, and (3) To evaluate the incidence of adverse events related to the drug combination. Methods: This is an open label phase 2 study. A total of 40 patients will receive T (1.2 mg/m2 CIV over 24 hours q3 weeks), N (240 mg IV over 30 min q 2 weeks) and TVEC (intratumorally q 2 weeks according to tumor size). Eligible patients are those with histopathologically confirmed diagnosis of locally advanced, unresectable or metastatic sarcoma including desmoid tumor and chordoma, previously untreated or treated, with measurable disease by RECIST v1.1, and at least, one accessible tumor for intratumoral injection of TVEC. Currently, 31 of the 40 patients have been enrolled. Statistical Considerations: Continuous variables will be summarized by the sample size (n), mean, standard deviation, first and third quartiles, minimum and maximum. Categorical variables will be summarized by the n and percent in each category. Point estimates for efficacy endpoint incidences will be accompanied by a 2-sided 95% exact binomial CI. Time to event endpoints will be summarized descriptively using the KM method. Safety (incidence and severity of adverse events and significant laboratory abnormalities) will be performed on all patients (ITT population). Patient incidence of all treatment emergent AEs will be tabulated by system organ class and preferred term. Clinical trial information: 03886311 .