A Study of SY 5609, a Selective CDK7 Inhibitor, in Advanced Solid Tumors
![]() |
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. |
ClinicalTrials.gov Identifier: NCT04247126 |
Recruitment Status :
Recruiting
First Posted : January 29, 2020
Last Update Posted : January 22, 2021
|
- Study Details
- Tabular View
- No Results Posted
- Disclaimer
- How to Read a Study Record
Condition or disease | Intervention/treatment | Phase |
---|---|---|
Advanced Solid Tumor Breast Cancer | Drug: SY-5609 Drug: Fulvestrant | Phase 1 |
Study Type : | Interventional (Clinical Trial) |
Estimated Enrollment : | 80 participants |
Allocation: | Non-Randomized |
Intervention Model: | Sequential Assignment |
Masking: | None (Open Label) |
Primary Purpose: | Treatment |
Official Title: | A Phase 1 Study of SY 5609, an Oral, Selective CDK7 Inhibitor, in Adult Patients With Select Advanced Solid Tumors |
Actual Study Start Date : | January 23, 2020 |
Estimated Primary Completion Date : | June 2021 |
Estimated Study Completion Date : | January 2023 |

Arm | Intervention/treatment |
---|---|
Experimental: Single Agent Dose Escalation
Dose escalation phase to explore maximum tolerated dose of SY-5609 given as a single agent.
|
Drug: SY-5609
An oral CDK7 Inhibitor |
Experimental: SY-5609 + Fulvestrant
Patients with hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2) negative advanced or metastatic breast cancer (BC) that has progressed following prior treatment with a cyclin-dependent kinase (CDK)4/6 inhibitor in combination with hormonal therapy will receive SY-5609 in combination with fulvestrant.
|
Drug: SY-5609
An oral CDK7 Inhibitor Drug: Fulvestrant estrogen receptor antagonist |
- Single Agent Dose Limiting Toxicity [ Time Frame: Through Study Completion, an average of one year ]
- Single Agent Incidence of Adverse Events [ Time Frame: Through Study Completion, an average of one year ]
- Changes in Hematologic Lab Values from Baseline [ Time Frame: Through Study Completion, an average of one year ]Number of Patients with Effects on Laboratory Parameters
- Changes in Chemistry Lab Values from Baseline [ Time Frame: Through Study Completion, an average of one year ]Number of Patients with Effects on Laboratory Parameters
- Changes in Coagulation Values from Baseline [ Time Frame: Through Study Completion, an average of one year ]Number of Patients with Effects on Laboratory Parameters
- Changes in Urinalysis Values from Baseline [ Time Frame: Through Study Completion, an average of one year ]Number of Patients with Effects on Laboratory Parameters
- Changes in Electrocardiograms (ECGs) [ Time Frame: Through Study Completion, an average of one year ]QT Interval
- Body Temperature [ Time Frame: Through Study Completion, an average of one year ]Celcius
- Blood Pressure [ Time Frame: Through Study Completion, an average of one year ]mm/hg
- Heart Rate [ Time Frame: Through Study Completion, an average of one year ]Beats per Minute
- Respiratory Rate [ Time Frame: Through Study Completion, an average of one year ]Breaths per Minute

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.
Ages Eligible for Study: | 18 Years and older (Adult, Older Adult) |
Sexes Eligible for Study: | All |
Accepts Healthy Volunteers: | No |
Inclusion Criteria:
- Age ≥ 18 years
- Advanced Solid Tumors for which standard curative or palliative measures do not exist or are no longer effective (Group 1 only).
- Postmenopausal women with HR-positive, HER2-negative advanced or metastatic breast cancer. Patients must have failed prior treatment with a CDK 4/6 inhibitor in combination with hormonal therapy in a previous line of therapy (Group 2 only).
- Patients must have at least one (1) measurable lesion by Response Evaluation Criteria in Solid Tumors (RECIST) v1.1.
- All toxicities (except alopecia) from prior cancer treatments must have resolved to ≤ Grade 1 before enrollment.
- For women of childbearing potential (WCBP): negative serum β human chorionic gonadotropin pregnancy test within 1 week before the first dose of SY 5609
- Adequate organ and marrow function
- Patients must be willing and able to comply with all aspects of the protocol
- Patients must provide written informed consent before any study-specific screening procedures
Exclusion Criteria:
- Chemotherapy or limited field radiotherapy within two (2) weeks, wide field radiotherapy within four (4) weeks, or nitrosoureas or mitomycin C within six (6) weeks before entering the study
- Major surgery within two (2) weeks before starting the study treatment, or not recovered to baseline status from the effects of surgery received > two (2) weeks prior
- Received any other investigational agents within 4 weeks before enrollment, or < five (5) half-lives since completion of previous investigational therapy, whichever is shorter
- Received previous noncytotoxic, US Food and Drug Administration-approved anticancer agent within previous two (2) weeks, or < five (5) half-lives since completion of previous therapy, whichever is shorter
- Known brain metastases or carcinomatous meningitis
- Immunocompromised patients with increased risk of opportunistic infections
- Patients with known active or chronic hepatitis B or active hepatitis C infection. Patients with a history of hepatitis C virus (HCV) infection who have completed curative therapy for HCV at least 12 weeks before Screening and have a documented undetectable viral load at Screening are eligible for enrollment.
-
Baseline QT interval corrected (QTc) with Fridericia's method > 480 ms
- NOTE: criterion does not apply to patients with a right or left bundle branch block (QTc interval)
- Female patients who are pregnant or breastfeeding
- History of clinically significant cardiac disease or clinically relevant uncontrolled cardiac risk factors
- Uncontrolled intercurrent illness

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04247126
Contact: Kimberley Caliri | 617-674-9053 | kcaliri@syros.com | |
Contact: Tiffany Crowell | 617-674-9069 | tcrowell@syros.com |
United States, Massachusetts | |
Massachusetts General Hospital | Recruiting |
Boston, Massachusetts, United States, 02114 | |
Contact: Rachel Annese RANNESE2@mgh.harvard.edu | |
Principal Investigator: Dejan Juric, MD | |
Dana Farber Cancer Institute | Recruiting |
Boston, Massachusetts, United States, 02215 | |
Contact: Amanda Fiorentino Amandam_fiorentino@dfci.harvard.edu | |
Principal Investigator: Geoffrey Shapiro, MD | |
United States, Michigan | |
START Midwest, LLC | Recruiting |
Grand Rapids, Michigan, United States, 49546 | |
Contact: Shannon Skibinski-Preston 616-954-5552 shannon.skibinski@startmidwest.com | |
Principal Investigator: Manish Sharma, MD | |
United States, Oklahoma | |
Stephenson Cancer Center | Recruiting |
Oklahoma City, Oklahoma, United States, 73104 | |
Contact: Dana Low Dana-Low@ouhsc.edu | |
Principal Investigator: Debra Richardson, MD | |
United States, Pennsylvania | |
Sidney Kimmel Cancer Center | Recruiting |
Philadelphia, Pennsylvania, United States, 19107 | |
Contact: Allison Scott Allison.Scott@jefferson.edu | |
Principal Investigator: Babar Bashir, MD | |
United States, Tennessee | |
Sarah Cannon Research Institute - Tennessee Oncology | Recruiting |
Nashville, Tennessee, United States, 37203 | |
Contact: Jacquelyn Spence 615-340-2830 jacquelyn.spence@sarahcannon.com | |
Principal Investigator: Erika Hamilton, MD | |
United States, Texas | |
South Texas Accelerated Research Theraputics (START), LLC | Recruiting |
San Antonio, Texas, United States, 78229 | |
Contact: Isabel Jimenez, RN, MSN 210-593-5265 isabel.jimenez@startsa.com | |
Principal Investigator: Kyriakos Papadopoulos, MD |
Responsible Party: | Syros Pharmaceuticals |
ClinicalTrials.gov Identifier: | NCT04247126 |
Other Study ID Numbers: |
SY-5609-101 |
First Posted: | January 29, 2020 Key Record Dates |
Last Update Posted: | January 22, 2021 |
Last Verified: | January 2021 |
Individual Participant Data (IPD) Sharing Statement: | |
Plan to Share IPD: | No |
Studies a U.S. FDA-regulated Drug Product: | Yes |
Studies a U.S. FDA-regulated Device Product: | No |
Neoplasms Fulvestrant Antineoplastic Agents, Hormonal Antineoplastic Agents Estrogen Receptor Antagonists |
Estrogen Antagonists Hormone Antagonists Hormones, Hormone Substitutes, and Hormone Antagonists Physiological Effects of Drugs |