On March 28, 2022 Molecular Templates, Inc. (Nasdaq: MTEM, "Molecular Templates," or "MTEM"), a clinical-stage biopharmaceutical company focused on the discovery and development of proprietary targeted biologic therapeutics, engineered toxin bodies (ETBs), reported financial results for the fourth quarter of 2021 (Press release, Molecular Templates, MAR 28, 2022, View Source [SID1234611108]).
Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:
Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing
Schedule Your 30 min Free Demo!
"2022 is off to a very promising start, following a number of important developments across our pipeline of ETBs in 2021," said Eric Poma, Ph.D., Chief Executive and Chief Scientific Officer of Molecular Templates. "We continue to see differentiated pharmacodynamic effects and evidence of antigen seeding with MT-6402 with additional data expected throughout 2022. We continue dose finding for the MT-5111 and MT-0169 programs with clinical data expected this year. We plan to file an IND in 2H22 for our CTLA-4 program and are moving forward with our earlier stage pipeline of ETBs in preclinical development targeting TIGIT, TROP-2, and BCMA."
Company Highlights and Upcoming Milestones
Corporate
MTEM expects to provide periodic updates on MT-6402, MT-5111, and MT-0169 throughout 2022.
MTEM has had six abstracts accepted for presentation at the upcoming American Association for Cancer Research (AACR) (Free AACR Whitepaper) Meeting 2022, taking place from April 8-13, 2022.
Gabriela Gruia, M.D. appointed to the Board of Directors.
Megan Filoon promoted to General Counsel.
MT-6402 (PD-L1 ETB with Antigen Seeding Technology)
MTEM continues to enroll patients in the Phase 1 study of MT-6402 which began in July 2021. MT-6402 is the first of MTEM’s 3rd generation ETBs to enter the clinic. It was designed to induce potent anti-tumor effects via PD-L1 targeting through multiple mechanisms that may overcome the limitations of approved checkpoint inhibitors.
The Phase 1 study is a multi-center, open-label, dose escalation and dose expansion trial in the United States. Patients with confirmed PD-L1 expressing tumors or confirmed PD-L1 expression in the tumor microenvironment are eligible for enrollment.
The 16 mcg/kg cohort (cohort 1) was completed with no DLTs observed in the six patients treated. One patient in cohort 1 with non-small cell lung cancer (NSCLC) had evaluable-only multiple sites of bone disease that appeared to have resolved on bone scan with only one remaining site which showed decreased uptake. This patient remained on MT-6402 up to cycle 8 when increased uptake was noted on bone scan and treatment was discontinued.
Six patients have been treated in the 24 mcg/kg cohort (cohort 2). One DLT, a grade 3 dermatitis of two days duration, occurred six days after the first dose in cohort 2 in one patient. The patient was treated with systemic steroids and treatment with MT-6402 was held until cycle 2, dose 1, at which time the patient was re-challenged at the same dose without development of recurrent dermatitis.
Following a review of the safety data from cohort 2 (24 mcg/kg), patient enrollment in cohort 3 initiated at a dose of 32 mcg/kg.
MTEM continues to observe pharmacodynamic (PD) effects including monocyte depletion and T cell activation in the 24 mcg/kg cohort. The extent and timing of these PD effects appear dose-related with patients in the 24 mcg/kg generally showing a more rapid and profound PD effect.
Six patients remain on study with five patients awaiting their first efficacy assessment. Dose escalation continues as planned and following determination of the maximum tolerated dose (MTD), expansion cohorts are planned to evaluate MT-6402 as a monotherapy in tumor-specific and PD-L1 positive basket tumor cohorts.
In 2021, MT-6402 was granted Fast Track Designation by the U.S. Food and Drug Administration for the treatment of patients with advanced NSCLC expressing PD-L1.
MT-5111 (HER2 ETB)
The Phase 1 study of MT-5111 in HER2-positive cancers is ongoing with multiple sites open for enrollment.
The HER2-positive breast cancer expansion cohort initiated in November 2021 at a dose of 10 mcg/kg.
As of January 2022, 30 patients had been treated with MT-5111 across eight dose escalation cohorts ranging from 0.5 mcg/kg to 13 mcg/kg without any DLTs.
There have been no signs of capillary leak syndrome (CLS) or significant cardiotoxicity observed to date with MT-5111.
Enrollment has initiated for the next cohort at 17 mcg/kg. Dose escalation will continue to determine the MTD, while the breast cancer expansion cohort collects efficacy and safety data.
MT-0169 (CD38 ETB)
In August 2021, MTEM assumed full rights to MT-0169 from its former co-development partner, Takeda, including full control of MT-0169 clinical development, per the terms of the terminated collaboration agreement with Takeda. Upon approval of a revised protocol, MTEM will continue to conduct the ongoing Phase 1 study for MT-0169 in relapsed/refractory multiple myeloma and non-Hodgkin’s lymphoma and plans to open new sites for the Phase I study.
A more rapid and complete elimination of CD38+ NK cells (a known PD marker for CD38-targeting therapeutics) was observed in the first five patients than had been predicted from in vitro and in vivo models, suggesting that the starting dose of 50 mcg/kg is higher than required.
A revised protocol was submitted to explore a lower dose of MT-0169 to reduce the risk of adverse events observed at the initial dose and to enable patients to continue MT-0169 therapy for a longer duration that may drive tumor benefit. Importantly, the robust and rapid NK cell depletion that was observed at the starting dose is expected to be observed at lower doses.
Research
MTEM continues to advance its pipeline of next-generation ETBs targeting CTLA-4, TIGIT, TROP2, BCMA, SLAMF-7, and CD45.
IND filing of an ETB in the CTLA-4 program is expected in 2H22.
Lead selection for TIGIT, TROP-2, and BCMA is ongoing.
MTEM plans to present preclinical data on its ETB candidates at AACR (Free AACR Whitepaper) in April 2022 and expects to present further preclinical data throughout the year at medical and scientific conferences.
Financial Results for the Fourth Quarter of 2021
The net loss attributable to common shareholders for the fourth quarter of 2021 was $10.2 million, or $0.18 per basic and diluted share. This compares with a net loss attributable to common shareholders of $28.4 million, or $0.57 per basic and diluted share, for the same period in 2020.
Revenues for the fourth quarter of 2021 were $18.0 million, compared to $3.5 million for the same period in 2020. Revenues for the fourth quarter of 2021 were comprised of revenues from collaborative research and development agreements with Vertex and Bristol Myers Squibb. Total research and development expenses for the fourth quarter of 2021 were $19.3 million, compared with $22.3 million for the same period in 2020. Total general and administrative expenses for the fourth quarter of 2021 were $7.9 million, compared with $7.1 million for the same period in 2020.
As of December 31, 2021, MTEM’s cash and investments totaled $152.0 million. MTEM’s current cash and investments are expected to fund operations into the fourth quarter of 2023.