Recruiting
Phase 1
Phase 2

Ruxolitinib & Enzalutamide

Sponsor:

University of Michigan Rogel Cancer Center

Code:

NCT06616155

Conditions

Castration-Resistant Prostate Carcinoma

Metastatic Prostate Adenocarcinoma

Stage IVB Prostate Cancer AJCC v8

Eligibility Criteria

Sex: Male

Age: 18+

Healthy Volunteers: Not accepted

Interventions

Biopsy

Biospecimen Collection

Bone Scan

Computed Tomography

Enzalutamide

Study Details

Brief summary:

This phase I/II tests the safety, side effects and best dose of ruxolitinib in combination with enzalutamide and how well it works in treating patients with prostate cancer that remains despite blocking hormone production (castration-resistant) and that has spread from where it first started to other places in the body (metastatic). Ruxolitinib, a kinase inhibitor, slows down the growth of the tumor by blocking the proteins, JAK1 and JAK2, tumors use to grow. Enzalutamide, an androgen receptor inhibitor, works by blocking the effects of androgen (a male reproductive hormone). This may help stop the growth and spread of tumor cells that need testosterone to grow. Giving ruxolitinib in combination with enzalutamide may be safe, tolerable, and/or effective in treating metastatic castration-resistant prostate cancer.

Conditions

Castration-Resistant Prostate Carcinoma

Metastatic Prostate Adenocarcinoma

Stage IVB Prostate Cancer AJCC v8

Study ID

NCT06616155

Start date

Jun, 2026

Status verified date

Apr, 2026

Completion date

Jun, 2030

Anticipated

Primary completion date

Jun, 2028

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: Male

Age: 18+

Healthy Volunteers: Not accepted

Inclusion Criteria:

  • Written informed consent and Health Insurance Portability and Accountability Act (HIPAA) authorization for release of personal health information prior to registration
  • Males age ≥ 18 years with progressive metastatic, castration-resistant prostate cancer, previous adenocarcinoma histology confirmation required
  • Ability to understand a written informed consent document, as determined by the study physician or designee
  • Surgical castration or continuous medical castration ≥ 8 weeks prior to screening; serum testosterone < 50 ng/dL
  • Have progressed on prior abiraterone treatment by Prostate Cancer Working Group 3 prostate specific antigen (PSA) criteria

  • PSA must rise on two measurements at least 1 week apart in order to be eligible. Refer to PCWG3 for clarification.
  • Most Recent absolute PSA must be > 2.0 ng/mL
  • Patient meets definition of poor responder to abiraterone by one of the following:

  • Abiraterone started in hormone-sensitive prostate cancer (HSPC) disease setting (abiraterone started within 4 months of starting continuous androgen deprivation therapy \[ADT\]): < 12 months duration on abiraterone
  • Abiraterone started in castration-resistant prostate cancer (CRPC) disease setting: < 6 months duration on abiraterone due to progression or failure to achieve PSA50 response while on therapy
  • The patient's current or most recent treatment is ADT and abiraterone. Participants must sign consent within 30 days of discontinuing abiraterone or prior to stopping abiraterone
  • Patients must be willing to undergo metastatic tumor biopsy during screening. If no metastatic lesion is safely accessible to tumor biopsy, this requirement will not be required
  • 50% of patients must have measurable disease by RECIST 1.1 criteria

  • Once 50% of total expected cohort has non-measurable disease, only patients with measurable disease by RECIST 1.1 criteria will be eligible. (Percentages with measurable disease are not relevant within dose escalation. Once dose expansion is started, those at expansion dose would be included in percentage evaluation.)
  • Eastern Cooperative Oncology Group (ECOG) performance status of 0 - 2 (grade 2 ECOGs should be related to disease and thus potentially reversible)
  • A male participant must agree to use of contraception during the treatment period and for at least 90 days after the last dose of study drug. Female partners of male patients should also use contraception for 90 days after the last dose of study drug if they are of childbearing potential
  • Platelets ≥ 125,000/mm\^3 (obtained within 28 days prior to starting study therapy) (if creatinine clearance \[CrCl\] is between 30-59, the platelet entry criteria is > 150,000/mm\^3)
  • Absolute neutrophil count (ANC) ≥ 1500/mm\^3 (obtained within 28 days prior to starting study therapy)
  • Hemoglobin ≥ 11 g/dL (obtained within 28 days prior to starting study therapy) No transfusions within 90 days prior to screening unless performed for acute bleeding
  • Aspartate aminotransferase (AST)/alanine aminotransferase (ALT) ≤ 3 x upper limit of normal (ULN) (obtained within 28 days prior to starting study therapy) For patients with known liver metastasis: (ALT) and aspartate aminotransferase (AST) ≤ 5 x ULN
  • Bilirubin ≤ 1.5 the upper limit of normal (ULN) OR direct bilirubin ≤ ULN for participants with total bilirubin levels > 1.5 x ULN. For subjects with known Gilbert's disease, bilirubin ≤ 3.0 mg/dL (obtained within 28 days prior to starting study therapy)
  • Creatinine clearance (CrCl) ≥ 30 mL/min (obtained within 28 days prior to starting study therapy) For creatinine clearance estimation, the Cockcroft and Gault equation should be used

Exclusion Criteria:

  • History of untreated (with radiotherapy and/or surgery) brain metastasis is not allowed (stable and treated metastases are allowed)
  • History of seizures or known hypersensitivity to enzalutamide, ruxolotinib or any of the excipients in the product
  • Patients unable to swallow orally administered medication and patients with gastrointestinal disorders likely to interfere with the absorption of the study medications
  • Uncontrolled hypertension as indicated by systolic blood pressure (SBP) > 170 mmHg or diastolic blood pressure (DBP) > 105 mmHg on 2 consecutive measurements at screening visit unless known to have white coat hypertension syndrome
  • Have received chemotherapy in the metastatic castration-resistant setting (docetaxel within the hormone sensitive setting is allowed)
  • Failure to recover to grade 1 or lower toxicity related to prior systemic therapy (excluding alopecia and neuropathy) prior to study consent
  • Current active infection with any of the following: hepatitis B, hepatitis C, active tuberculosis, latent tuberculosis. Patients with well controlled HIV are eligible however all drug interactions with HIV drug and study therapies have to be reviewed
  • History of myocardial infarction, stroke, pulmonary embolism or deep vein thrombosis within 6 months of study enrollment
  • Study physician estimates life expectancy less than 6 months or patient is unable to swallow medications
  • Patients currently taking fluconazole
  • Currently receiving supplements containing androgens or medications known to be strong inhibitors of CYP2C8, strong inducers (except enzalutamide) or strong inhibitors of CYP3A4 and substrates of CYP3A4, CYP2C9 and CYP2C19 with a narrow therapeutic window. If substitution is possible, strong inducers, inhibitors and substrates must be discontinued at least 7 days or 5 half-lives (which ever longer) prior to the first administration of enzalutamide
  • Due to risk of tuberculosis (TB) reactivation, patients deemed at high risk by treating provider (e.g., close contact with someone with active TB, history of active/latent TB) should be excluded
  • Those with underlying hepatic disease with a CHILD-PUGH class A, B or C impairment are excluded

Study Design

Enrollment

20 participants

Anticipated

Intervention Model

Single group

Primary purpose

Treatment

Interventions and Outcome Measures

Arms

experimental: Treatment (ruxolitinib, enzalutamide)

Patients receive ruxolitinib PO BID and enzalutamide PO QD on days 1-28 of each cycle. Cycles repeat every 28 days in the absence of disease progression or unacceptable toxicity. Patients also undergo blood sample collection, CT and bone scan throughout the study. Patients may also undergo a tissue biopsy on study.

Interventions

Biopsy

Undergo tissue biopsy

Biospecimen Collection

Undergo blood sample collection

Bone Scan

Undergo bone scan

Computed Tomography

Undergo CT

Enzalutamide

Given PO

Ruxolitinib

Given PO

Primary outcome measure

  • Dose-limiting toxicity (DLT) [ Time Frame: Up to 28 days ]
  • Maximum tolerated dose (MTD) [ Time Frame: Up to 28 days ]

Central Contacts and Locations

Central contacts

Cancer AnswerLine

1-800-865-1125CancerAnswerLine@med.umich.edu

Locations

University of Michigan Comprehensive Cancer Center

Recruiting

Ann Arbor, Michigan, United States, 48109

Contacts

Cancer AnswerLine

800-865-1125CancerAnswerLine@med.umich.edu

Principal Investigator:

Zachery R. Reichert

More Information

Sponsor

University of Michigan Rogel Cancer Center

Last update posted

May 5, 2026

Last verified

Apr, 2026

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-10. This information was provided to ClinicalTrials.gov by University of Michigan Rogel Cancer Center on 2026-05-05.