Molecular Templates Presents Clinical Data at the American Society of Clinical Oncology (ASCO) Annual Meeting 2018
ASCO Posters Feature Data on MT-3724 and Evofosfamide
|Poster Title:||Safety and Efficacy of Anti-CD20 Immunotoxin MT-3724 in Relapsed/Refractory B-cell non-Hodgkin Lymphoma (NHL) in a Phase 1 Study|
|First Author:||Paul A. Hamlin, MD, Memorial Sloan Kettering Cancer Center|
The poster summarized interim results from a Phase I and Phase Ib extension study of B-cell non-Hodgkin’s lymphoma (
Patients with high circulating levels of rituximab (RTX) at study entry showed poor response to MT-3724 due to competitive inhibition and blocking of CD20 receptor by RTX. As a result, the ongoing Phase Ib extension and future studies of MT-3724 will enroll only patients with low levels of RTX.
The preliminary objective response rate in DLBCL patients with low serum Rituxan levels at study entry (N=10) was 30%, with a disease control rate of 70%, including two stable disease patients that had tumor reductions of 47% and 49%. The ongoing Phase Ib study will further characterize the response rate and duration of response.
MT-3724 was generally well tolerated and a redefined maximum tolerated dose (MTD) of 50 mcg/kg with a maximum of 6 mg per dose was implemented based on experience with patients with high body weight who received a high total dose at 75mcg/kg. Enrollment in the study has recently resumed after approval of the new MTD.
In addition to this ongoing Phase Ib extension,
|Poster Title:||Unexpected Pharmacokinetics of Evofosfamide Observed in Phase III MAESTRO Study|
|First Author:||Jack P. Higgins, Ph.D., Molecular Templates, Inc.|
This poster compares the pharmacokinetic (PK) profile of evofosfamide from the Phase II (“404” study) and Phase III (“MAESTRO”) trials completed in patients with advanced pancreatic cancer. The Phase II (“404”) study of evofosfamide in pancreatic cancer (N=214) showed promising response rates, progression-free survival, and overall survival. MAESTRO, a Phase III study in the same patient population (N=693) failed to replicate the clinical benefit seen in the Phase II (“404”) study. A new ethanol-based formation was introduced before the initiation of MAESTRO and the drug exposure was substantially lower than the exposure in the Phase II (“404”) study at the same dose. In the Japanese MAESTRO patients who received evofosfamide (N=59), substantially higher drug exposure was observed with correspondingly better clinical outcomes versus patients in the study from the rest of the world. We surmise that the formulation change may have adversely affected drug exposure and may have caused the reduced clinical benefit observed in MAESTRO.
Evofosfamide (in the current ethanol-based formulation) at higher doses is currently being evaluated in a Phase I study, in combination with ipilimumab, in an attempt to replicate the exposure seen with the previous formulation in Phase II (“404”) study.
Molecular Templates is focused on the discovery, development and commercialization of next-generation immunotoxins called Engineered Toxin Bodies (ETBs) for the treatment of cancers and other serious diseases. For additional information, please visit Molecular Templates’ website at www.mtem.com.
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