On May 15, 2017 Syros Pharmaceuticals (NASDAQ: SYRS), a biopharmaceutical company pioneering the discovery and development of medicines to control the expression of disease-driving genes, reported that the first patient has been dosed in the Phase 1 clinical trial of SY-1365, its first-in-class selective cyclin-dependent kinase 7 (CDK7) inhibitor, in patients with advanced solid tumors, including transcriptionally dependent cancers such as triple negative breast, small cell lung and ovarian cancers (Press release, Syros Pharmaceuticals, MAY 15, 2017, View Source [SID1234519132]). Schedule your 30 min Free 1stOncology Demo! "SY-1365 represents a promising new approach for treating a number of aggressive cancers that have eluded treatment with other targeted approaches," said Anthony W. Tolcher, M.D., Director of Clinical Research at South Texas Accelerated Research Therapeutics (START), and a clinical investigator in the trial. "Certain cancers are particularly dependent on high expression of transcription factors for their growth and survival, and SY-1365 has shown substantial anti-tumor activity in preclinical models of these cancers. We’re pleased to have enrolled the first patient in this clinical trial and look forward to further investigating SY-1365 for patients with these difficult-to-treat solid tumors."
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SY-1365 has shown significant anti-proliferative and pro-apoptotic activity in multiple preclinical models of difficult-to-treat solid tumors, including triple negative breast, small cell lung and ovarian cancers. SY-1365 has induced anti-tumor activity in both cell line-derived xenograft and patient-derived xenograft models of triple negative breast cancer, including complete regressions at a twice weekly dosing regimen consistent with the initial regimen being used in the Phase 1 clinical trial. In preclinical models, SY-1365 has also been shown to preferentially kill cancer cells over non-cancerous cells and can lower the expression of oncogenic transcription factors, including MYC.
"Patients with triple negative breast, small cell lung and ovarian cancers, as well as other transcriptionally dependent cancers, are in dire need of better treatment options," said David A. Roth, M.D., Chief Medical Officer of Syros. "Based on the strong preclinical data, we believe SY-1365 could provide a meaningful benefit for patients with these cancers. We have designed our Phase 1 trial to efficiently assess early proof of mechanism during the dose escalation phase and early anti-tumor activity by focusing the expansion phase of the trial on a set of transcriptionally dependent tumors that are most sensitive to CDK7 inhibition and for which early anti-tumor activity may be observed."
The Phase 1 trial is a multi-center, open-label trial that is expected to enroll approximately 70 patients with advanced solid tumors, including expansion cohorts focused on transcriptionally dependent cancers. The primary objective of the trial is to assess the safety and tolerability of escalating doses of SY-1365, with the goal of establishing a maximum tolerated dose and a recommended Phase 2 dose and regimen. The dose-escalation phase will be open to solid tumor patients for whom standard curative or palliative measures do not exist or are no longer effective. Following the dose-escalation phase, expansion cohorts are planned to further evaluate the safety and anti-tumor activity of SY-1365 in patients with triple negative breast, small cell lung and ovarian cancers, to confirm a recommended Phase 2 dose and regimen, and to enroll patients with tumors of any histology in a cohort focused on analyzing biopsied tumor tissue. Syros plans to expand future clinical development of SY-1365 into acute leukemias based on the data generated in this trial. Additional details about the trial can be found using the identifier NCT03134638 at www.clinicaltrials.gov.