for people ages 18 years and up (full criteria)
study started
estimated completion
Principal Investigator
by Zev Wainberg (ucla)



The study consists of 2 parts. Part 1 is dose escalation and will first administer SY-5609 alone to participants with select advanced solid tumors and then in combination with fulvestrant to participants with HR positive, HER2-negative breast cancer. Part 2 is a dose expansion and will first administer SY-5609 in combination with gemcitabine and then SY-5609 in combination with gemcitabine and nab-paclitaxel in participants with pancreatic ductal adenocarcinoma (PDAC) .

Official Title

A Phase 1 Study of SY 5609, an Oral, Selective CDK7 Inhibitor, in Adult Patients With Select Advanced Solid Tumors


Advanced Solid Tumor, Breast Cancer, Small-cell Lung Cancer, Pancreatic Cancer, Small Cell Lung Carcinoma, Gemcitabine, Paclitaxel, Fulvestrant, Nab-paclitaxel, SY-5609 + Fulvestrant, SY-5609 + Gemcitabine, SY-5609 + Gemcitabine + Nab-paclitaxel


You can join if…

Open to people ages 18 years and up

  1. Age ≥ 18 years
  2. Advanced Solid Tumors for which standard curative or palliative measures do not exist or are no longer effective (Group 1 only).
  3. Postmenopausal women with HR-positive, HER2-negative advanced or metastatic breast cancer. Participants must have failed prior treatment with a cyclin-dependent kinase (CDK) 4/6 inhibitor in combination with hormonal therapy in a previous line of therapy (Group 2 only).
  4. Participants with histologically or cytologically confirmed PDAC with measurable metastatic lesion(s) (Groups 3 and 4 only).
  5. Participants must have at least 1 measurable lesion by Response Evaluation Criteria in Solid Tumors (RECIST) v1.1.
  6. All toxicities (except alopecia) from prior cancer treatments must have resolved to ≤ Grade 1 before enrollment.
  7. For women of childbearing potential (WCBP): negative serum β human chorionic gonadotropin pregnancy test within 1 week before the first dose of SY 5609
  8. Adequate organ and marrow function
  9. Participants must be willing and able to comply with all aspects of the protocol
  10. . Participants must provide written informed consent before any study-specific screening procedures.
  11. . Albumin ≥ 3.0 grams/deciliters (g/dL) (Groups 3 and 4 only).

You CAN'T join if...

  1. Chemotherapy or limited field radiotherapy within 2 weeks, wide field radiotherapy within 4 weeks, or nitrosoureas or mitomycin C within 6 weeks before entering the study
  2. Major surgery within 2 weeks before starting the study treatment, or not recovered to baseline status from the effects of surgery received > 2 weeks prior
  3. Received any other investigational agents within 4 weeks before enrollment, or < 5 half-lives since completion of previous investigational therapy, whichever is shorter
  4. Received previous noncytotoxic, US Food and Drug Administration-approved anticancer agent within previous 2 weeks, or < 5 half-lives since completion of previous therapy, whichever is shorter
  5. Known brain metastases or carcinomatous meningitis
  6. Immunocompromised participants with increased risk of opportunistic infections
  7. Participants with known active or chronic hepatitis B or active hepatitis C infection. Participants 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.
  8. Baseline QT interval corrected (QTc) with Fridericia's method > 480 milliseconds

• NOTE: criterion does not apply to participants with a right or left bundle branch block (QTc interval)

  1. Female participants who are pregnant or breastfeeding
  2. . History of clinically significant cardiac disease or clinically relevant uncontrolled cardiac risk factors
  3. . Uncontrolled intercurrent illness.
  4. . Poorly controlled ascites requiring paracentesis within 1 month prior to entering the study. (Groups 3 and 4 only)


  • University of California Los Angeles accepting new patients
    Los Angeles California 90095 United States
  • Cedars-Sinai Medical Center accepting new patients
    Los Angeles California 90048 United States

Lead Scientist at University of California Health

  • Zev Wainberg (ucla)
    HS Clinical Professor, Medicine. Authored (or co-authored) 108 research publications


accepting new patients
Start Date
Completion Date
Syros Pharmaceuticals
Phase 1 research study
Study Type
Expecting 160 study participants
Last Updated