On September 11, 2023, the Company announced clinical data from its discontinued Phase 3 ARTEST clinical trial of enobosarm monotherapy for the 3rd line or greater in the metastatic setting of AR+ER+HER2- breast cancer. As previously announced, enrollment had been discontinued in order to prioritize and to focus the clinical development of enobosarm therapy earlier in the treatment sequence, the 2nd line metastatic setting, for androgen receptor positive (AR+), estrogen receptor positive (ER+) and human epidermal growth factor receptor 2 negative (HER2-) metastatic breast cancer in the Phase 3 ENABLAR-2 (enobosarm +/- abemaciclib CDK 4/6 inhibitor) study. Data reported from the discontinued trial, which is based on an analysis of available data, may not be predictive of the results of larger, later-stage controlled clinical trials. Product candidates that have shown promising results in early-stage clinical trials may still suffer significant setbacks in subsequent clinical trials.
Highlights of clinical data from discontinued Phase 3 ARTEST clinical study
At the time enrollment was stopped, there were 34 evaluable patients randomized to either 9mg enobosarm monotherapy (n=16) or a standard of care active control (n=18) in the Phase 3 open label, randomized (1:1) clinical trial for the treatment of AR+ER+HER2- metastatic breast cancer with sufficient AR expression in their breast cancer tissue who had previously received at least a nonsteroidal aromatase inhibitor, fulvestrant, and a CDK4/6 inhibitor.
The active control treatment group received an average of 2.6 (range 1-5) prior lines of treatment and the enobosarm 9mg monotherapy group received an average of 2.9 (range 1-5) prior lines of treatment. On average, enobosarm or the active control was given in the 4th line treatment for AR+ER+HER2- metastatic breast cancer.
Summary of Overall Response Rate Data*:
| | | | | | | | |
| | Enobosarm monotherapy | | | Estrogen blocking agent active control | |
Evaluable patients | | | 2 PR /16 (12.5 | %) | | | 0 PR/18 (0 | %) |
Evaluable patients - including an unconfirmed response | | | 3 PR /16 (18.8 | %) | | | 0 PR/18 (0 | %) |
Patients with ≤3 lines of prior endocrine therapy | | | 2 PR /10 (20.0 | %) | | | 0 PR/15 (0 | %) |
Patients with ≤3 lines of prior endocrine therapy with ≤1 prior treatment with CDK 4/6 inhibitor | | | 2 PR /6 (33.3 | %) | | | 0 PR/10 (0 | %) |
*unaudited data, overall response rate = partial response (PR) + complete response (CR)
Safety: Enobosarm monotherapy was generally well tolerated without masculinizing adverse events or increases in hematocrit.
Forward-Looking Statements
The statements in this release that are not historical facts are “forward-looking statements” as that term is defined in the Private Securities Litigation Reform Act of 1995. Forward-looking statements in this release include statements regarding: the planned design, enrollment, timing, commencement, interim and full data readout timing, scope, regulatory pathways, and results of the Company’s current and planned clinical trials, including the confirmatory Phase 3 study of sabizabulin for certain COVID-19 patients, the Phase 3 study of enobosarm in combination with abemaciclib for the 2nd line treatment of AR+ ER+ HER2 metastatic breast cancer, the Phase 3 study of enobosarm in bone-only non-measurable hormone receptor and HER2- metastatic breast cancer, the Phase 3 study of sabizabulin in hospitalized influenza patients at high risk of ARDS, and studies of sabizabulin in smallpox virus and Ebola virus, and whether any of such studies will meet any of its primary or secondary endpoint; whether the ENABLAR-2 study will show results consistent with or greater than the ARTEST results reported above; whether the data from the ARTEST study shown above is predictive of the results of any larger, later-stage, controlled clinical trial; whether and when any of the planned interim analyses in the planned Phase 3 confirmatory study of sabizabulin for certain COVID patients will occur and what the results of any such interim analyses will be; whether the results of such interim analyses or the completed confirmatory Phase 3 study or any other interim data will be sufficient to support a new EUA application or an NDA; whether and when the Company will expand the study of sabizabulin into other ARDS indications; whether and when the Company will receive the future installment payments of the ENTADFI purchase price or sales milestone payments; and the outlook for growth in the Company’s FC2 business through telehealth customers, our direct to patient telehealth portal and the global public health sector. These forward-looking statements are based on the Company’s current expectations and subject to risks and uncertainties that may cause actual results to differ materially, including unanticipated
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