ENCORE 601 Updates
In an oral presentation titled, "ENCORE-601: Phase 1b/2 study of entinostat (ENT) in combination with pembrolizumab in patients with non-small cell lung cancer (NSCLC),"
"The responses observed in patients receiving entinostat with pembrolizumab who had previously progressed on prior checkpoint blockade are encouraging, particularly in those who did not achieve responses on their prior PD-1 therapy. While the numbers of patients treated to date are small, these initial results support further exploring this combination to potentially address an unmet medical need for these patients," noted
In addition to the NSCLC data, the poster, "Analysis of biomarkers from a cohort of advanced melanoma patients previously exposed to immune checkpoint inhibition treated with entinostat (ENT) and pembrolizumab" containing updated data highlighting the clinical activity and novel translational research findings from the ENCORE 601 cohort of melanoma patients whose disease had progressed on prior PD-1 therapy was presented today. As of early September, four of 13 patients in this PD-1 refractory cohort remained on study, two of whom have received more than a year of the combination treatment. Pre-treatment tumor biopsies were obtained for all patients and matched post-treatment biopsies were available from nine patients. Gene expression, PD-1 and immunofluorescence analysis of tissue samples demonstrate that entinostat combined with KEYTRUDA may generate immune responsiveness in tumors previously resistant to immune checkpoint inhibition.
"Data presented at SITC continue to support our hypothesis that entinostat has the potential to enhance immune checkpoint blockade mediated anti-tumor responses in a broad range of tumors," said
The poster, "First in human, single ascending dose study in healthy volunteers of SNDX-6352, a humanized IgG4 monoclonal antibody targeting colony stimulating factor-1 receptor (CSF-1R)," containing safety, pharmacokinetic and pharmacodynamic data from the first in human, SAD trial of SNDX-6352, was also presented during the SITC annual meeting. Three dose levels of 0.15 mg/kg, 1 mg/kg, and 3 mg/kg were administered during the SAD trial, and increases in CSF-1 and IL-34, and transient reduction of circulating non-classical monocytes were observed, consistent with binding of SNDX-6352 to CSF-1R. The safety profile of SNDX-6352 was as expected, with mild to moderate adverse effects observed consistent with other agents in this class.
The SITC presentations are available in the Publications section of the Company's website, linked here.
About ENCORE 601
ENCORE 601 is an open-label, Phase 1b/2 clinical trial employing a Simon two-stage design to evaluate the combination of entinostat, the Company's class I selective HDAC inhibitor, plus Merck's anti-PD-1 (programmed death receptor-1) blocking therapy, KEYTRUDA®. The trial is evaluating four patient populations: Patients with non-small cell lung cancer (NSCLC) who have not previously received a PD-1 antagonist (cohort 1); patients with NSCLC who have progressed on a PD-1 antagonist (cohort 2); patients with advanced melanoma who have progressed on a PD-1 antagonist (cohort 3); and microsatellite stable colorectal cancer who have not previously been treated with a PD-1 antagonist (cohort 4). The Company previously announced that cohorts 1, 2 and 3 have met the pre-specified objective response threshold to advance into the second stage of the Phase 2 trial, and cohorts 2 and 3 have completed enrollment of the second stage of the trial. A decision on the advancement of cohort 4 is expected in the first half of 2018.
Syndax is a clinical stage biopharmaceutical company developing an innovative pipeline of cancer therapies. Our lead product candidate, entinostat, which was granted Breakthrough Therapy designation by the
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