UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM
CURRENT REPORT
PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
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Item 8.01 Other Events.
On April 4, 2024, eFFECTOR Therapeutics, Inc. (the “Company”) announced topline results from the primary analysis of the randomized Phase 2 KICKSTART trial which tested tomivosertib or placebo, each combined with pembrolizumab, as frontline treatment for patients with non-small cell lung cancer (“NSCLC”) with PD-L1 ≥50%. Based on 36 events, the hazard ratio for progression free survival (“PFS,” the primary endpoint of the study) using a stratified Cox proportional hazards model was 0.62 (95% confidence intervals 0.3 to 1.3) in favor of tomivosertib. The two-sided p value for PFS, based on a stratified log rank test, was 0.21, which did not meet the pre-specified threshold of p≤0.2. The median PFS was 13.0 weeks in the tomivosertib plus pembrolizumab arm and 11.7 weeks in the placebo plus pembrolizumab arm, respectively. Overall survival results remain immature, however no trend favoring tomivosertib was observed. There were 67% Grade 3 or higher treatment emergent adverse events in the tomivosertib plus pembrolizumab arm versus 37% in the placebo plus pembrolizumab arm.
While there was evidence of modest tomivosertib activity in the trial, based on the totality of the data currently available the Company does not see an obvious path forward to continue developing tomivosertib in frontline NSCLC. The Company plans to focus its development efforts on advancing zotatifin, which has a novel mechanism distinct from that of tomivosertib and is targeted to enter a randomized, potentially registrational trial in estrogen receptor positive (“ER+”) breast cancer later this year. The Company is focused on advancing zotatifin through development as efficiently as possible, building on the recent positive updates of median PFS (“mPFS”) and safety data at last year’s San Antonio Breast Cancer Symposium. As a next step for the zotatifin program, the Company expects to report additional data, including the recommended Phase 2 dose (“RP2D”), for zotatifin combined with fulvestrant and abemaciclib in the second half of 2024. In addition, as part of the Company’s strategy to leverage investigator-sponsored trials to conserve capital, a separate, investigator-sponsored trial of tomivosertib in acute myeloid leukemia (“AML”) will continue unchanged. The Company’s mechanistic rationale to test tomivosertib in AML is entirely distinct from the rationale in NSCLC and relies on tomivosertib’s potential to inhibit production of survival proteins Mcl-1 and Bcl-2, which are required for leukemia cell survival.
Forward-Looking Statements
The Company cautions you that statements contained in this report regarding matters that are not historical facts are forward-looking statements. The forward-looking statements are based on the Company’s current beliefs and expectations and include, but are not limited to: the potential therapeutic benefits of its product candidates; the Company’s plans to focus its development efforts on, and advance the development of, zotatifin in ER+ breast cancer, including the potential for additional data, determination of an RP2D and to enter a registrational trial, the timing thereof; the Company’s expectations for the continuation of the investigator initiated study of tomivosertib in AML; the Company’s strategy to maximize the value of all assets in its pipeline; and its plans regarding the presentation of data findings at a future medical conference. Actual results may differ from those set forth in this report due to the risks and uncertainties inherent in the Company’s business, including, without limitation: interim results previously reported for the zotatifin clinical trial are not necessarily indicative of final results and one or more of the clinical outcomes may materially change as patient enrollment continues, following more comprehensive reviews of the data and as more patient data becomes available, including the risk that unconfirmed responses may not ultimately result in confirmed responses to treatment after follow-up evaluations; topline results that the Company reports is based on a preliminary analysis of key efficacy and safety data, and such data may change following a more comprehensive review of the data related to the clinical trial and such topline data may not accurately reflect the complete results of a clinical trial; the Company may be unable to identify a path forward for zotatifin or tomivosertib based on its limited capital resources, which the Company may use sooner than expected and may be insufficient to allow clinical trial readouts or further clinical development or for the Company to continue its operations; the Company’s lender may seek to declare a default under its loan and security agreement to the extent that a material adverse change in the Company’s business is deemed to have occurred or otherwise and accelerate immediate repayment of all outstanding obligations under its loan agreement; its dependence on third parties in connection with product manufacturing, research and preclinical and clinical testing; the results of preclinical studies and early clinical trials are not necessarily predictive of future results; the success of the Company’s clinical trials and preclinical studies for its product candidates is uncertain; regulatory developments in the United States and foreign countries; unexpected adverse side effects or inadequate efficacy of the Company’s product candidates that may limit their development, regulatory approval and/or commercialization, or may result in recalls or product liability claims; and other risks described in the Company’s prior filings with the Securities and Exchange Commission. You are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof, and the Company undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date hereof. All forward-looking statements are qualified in their entirety by this cautionary statement, which is made under the safe harbor provisions of the Private Securities Litigation Reform Act of 1995.
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
eFFECTOR Therapeutics, Inc. | ||||||
Date: April 4, 2024 | By: | /s/ Michael Byrnes | ||||
Name: | Michael Byrnes | |||||
Title: | Chief Financial Officer |
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