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A Phase I/II Study of TRC105 in Metastatic Castrate Resistant Prostate Cancer (CRPC)

This study has been completed.
Information provided by (Responsible Party):
National Institutes of Health Clinical Center (CC) ( National Cancer Institute (NCI) ) Identifier:
First received: March 19, 2010
Last updated: October 3, 2014
Last verified: June 2014


  • Currently, there is no curative therapy for metastatic castrate-resistant prostate cancer (CRPC), a leading cause of death in men. However, researchers are exploring new treatments that involve drugs that prevent angiogenesis (the process by which new blood vessels are formed) and can slow or prevent tumor growth.
  • TRC105 is an experimental drug that blocks angiogenesis, and has been studied for possible use in treating different kinds of cancer. However, it has not been validated to treat prostate cancer in general or CRPC in particular.


  • To determine the effects of TRC105 as a treatment for CRPC
  • To determine the safety and effectiveness of TRC105 in treating CRPC


- Men at least 18 years of age who have been diagnosed with castrate-resistant prostate cancer for which existing treatments have not been effective.


  • Eligible individuals will have a series of blood and other tests to determine their suitability for participating in the study.
  • Participants will receive intravenous infusions of TRC105 in a 28-day treatment cycle. Infusions will be given on Day 1 and Day 14 of each cycle.
  • Participants will receive different doses of TRC105 depending on when they enter the study, up to a maximum tolerated dose or optimum treatment dose.
  • Frequent blood and urine tests will be performed during treatment, as well as other tests of cancer progression as directed by the study doctors. Participants will receive medicines to help prevent possible adverse side effects of TRC105, such as allergic reaction to the drug.
  • Participants will continue treatment with TRC105 until they or the study team decides that the medication is not beneficial. No additional testing will be required unless participants discontinue the treatment because of side effects (which the study doctors will follow until the side effects are resolved).

Condition Intervention Phase
Prostate Cancer
Metastatic Castrate Resistant Prostate Cancer
Drug: TRC105
Phase 1
Phase 2

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Treatment
Official Title: A Phase I/II Study of TRC105 in Metastatic Castrate Resistant Prostate Cancer (CRPC)

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Primary Outcome Measures:
  • Define the maximum tolerable dose (MTD) of TRC105 given every two weeks. Determine if single-agent TRC105, when administered at MTD to patients with CRPC, is associated with a 6-month progression-free survival probability of 30%. [ Time Frame: 6 month progression - free survival ] [ Designated as safety issue: Yes ]

Secondary Outcome Measures:
  • Define the dose-limiting toxicities and toxicity profile of TRC105 given every two weeks. Evaluate time to disease progression, overall response rate, and overall survival. [ Time Frame: Evaluate time to disease progression, overall response rate and overall survival ] [ Designated as safety issue: No ]

Enrollment: 21
Study Start Date: February 2010
Study Completion Date: June 2014
Primary Completion Date: June 2014 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: Arm 1
No prior chemotherapy or antiangiogenic therapy
Drug: TRC105
Active Comparator: Arm 2
Evidence of disease progression despite prior docetaxel and bevacizumab. Any number of treatment lines is available.
Drug: TRC105

Detailed Description:


- Inhibition of angiogenesis has demonstrable antitumor efficacy against castrate-resistant prostate cancer (CRPC). TRC105 is a human/murine chimeric IgG1 kappa monoclonal antibody that binds to human CD105 (endoglin), thus inhibiting angiogenesis and tumor growth. Data from an ongoing phase I clinical trial suggest that TRC105 is well tolerated with evidence of clinical efficacy in patients with metastatic CRPC.

Primary Objectives:

  • Define the maximum tolerable dose (MTD) of TRC105 given every one to two weeks.
  • Determine if single-agent TRC105, when administered at 20 mg/kg IV every two weeks (the phase I MTD) to patients with CRPC, is associated with a 6-month progression-free survival probability of 30%

Secondary Objectives:

  • Define the dose-limiting toxicities and toxicity profile of TRC105 given every one to two weeks
  • Evaluate time to disease progression, overall response rate and overall survival.
  • Describe the prostate specific antigen (PSA) response rate to therapy with TRC105
  • Characterize the pharmacokinetics of TRC105
  • Demonstrate a biologic effect of TRC105 in the patient and, when possible, on the tumor via laboratory evaluation of the molecular markers of angiogenesis before and after drug administration respectively


  • Progressive, castrate-resistant, metastatic adenocarcinoma of the prostate
  • ECOG less than or equal to 2


  • An initial single-arm, phase I dose escalation study open to all patients with progressive metastatic CRPC. The study will evaluate patients in five cohorts of escalating dose levels. A maximum of 30 patients will be needed to complete the phase I evaluation.
  • Following completion of the phase I study will be a two-stage, phase II study that will be conducted separately in the following two arms:

    1. Chemotherapy-na(SqrRoot) ve for metastatic disease (no prior antiangiogenic therapy)
    2. Post-docetaxel disease progression
  • In each arm, the primary objective will be to determine if a 6 month progression free survival probability of 30.0% can be identified.
  • Initially, 12 patients will be enrolled in each stratum and evaluated for progression. If 2 or more are progression-free at 6 months, then enrollment will continue until a full 35 patients have been enrolled in that stratum. Enrollment may continue to the other stratum if one stratum has ended accrual.

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Male
Accepts Healthy Volunteers:   No


  1. Patients must have histopathological confirmation of prostate cancer by the Laboratory of Pathology of the NCI, Pathology Department of the National Naval Medical Center or Pathology Department of Walter Reed Army Medical Center prior to entering this study. Patients whose pathology specimens are no longer available may be enrolled in the trial if the patient has a clinical course consistent with prostate cancer and available documentation from an outside pathology laboratory of the diagnosis. In cases where original tissue blocks or archival biopsy material is available, efforts will be made to contact referring physicians and outside pathology departments to have the material forwarded to the research team for use in correlative studies.
  2. Patients must have metastatic progressive castrate-resistant prostate cancer defined as progressive disease (see below) despite surgical castration or ongoing use of gonadotropin-releasing hormone agonists with confirmed castrate levels of testosterone.

    Criteria of progression for trial eligibility are defined from the Prostate Cancer Clinical Trials Working Group-2. Clinically progressive prostate cancer must be evidenced and documented by any of the following parameters:

    1. Two consecutively rising PSA values at a minimum of 1-week intervals (2.0 ng/mL is the minimum starting value for PSA)
    2. Appearance of one or more new lesion on bone scans
    3. Progressive measurable disease by RECIST 1.1

    Patients on flutamide for at least 6 months must have disease progression at least 4 weeks after withdrawal. Patients on bicalutamide or nilutamide for at least 6 months must have progression at least 6 weeks after withdrawal.

    All patients enrolled will be required to have measurable or non-measurable disease on imaging studies.

  3. Phase II study patients enrolled onto Arm 1 (chemotherapy-na(SqrRoot) ve) may not have received any prior chemotherapy or antiangiogenic therapy for metastatic prostate cancer. Those patients enrolled onto Arm 2 must have evidence of disease progression (per criteria stated above) despite prior docetaxel. Any number of prior treatment lines is acceptable.
  4. Age greater than or equal to 18 years.
  5. Life expectancy of greater than 3 months.
  6. ECOG performance status 0-2.
  7. Patients must have normal organ and marrow function as defined below:

    • Absolute neutrophil count greater than or equal to 1,500/mcL
    • Platelets greater than or equal to 100,000/mcL
    • Total bilirubin less than or equal to 1.5 times upper normal limits or less than 3 mg/dl in subjects with Gilbert's Syndrome
    • AST/ALT less than or equal to 2.5 times upper limit of normal
    • Creatinine less than or equal to 1.5 times upper normal limits OR creatinine clearance greater than or equal to 40 mL/min/1.73 m(2) for patients with creatinine levels above institutional normal, as calculated by the Cockcroft Gault formula.
  8. Patients must have recovered from any acute toxicity related to prior therapy, including surgery. Toxicity should be less than or equal to grade 1 or returned to baseline.
  9. All patients who have not undergone bilateral surgical castration must continue suppression of testosterone production by appropriate usage of GnRH agonists or antagonists.
  10. Patients must not have other invasive malignancies (within the past 2 years with the exception of non-melanoma skin cancers or non-invasive bladder cancer).
  11. Enrolled patients must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, the duration of study participation and 3 months after the end of the treatment.
  12. Patient must be able to understand and willing to sign a written informed consent document.
  13. Patients on a stable dose of steroids of 10 mg/day or less can continue on steroids if they are on peptic ulcer disease prophylaxis with an H2-blocker or proton pump inhibitor.


  1. Patients who have had chemotherapy, large field radiotherapy, or major surgery must wait 3 weeks prior to entering the study.
  2. Patients may not be receiving any agents not approved by the FDA within the past 4 weeks.
  3. Patients with known brain metastases will be excluded from this clinical trial because of their poor prognosis and because they often develop progressive neurologic dysfunction that would confound the evaluation of neurologic and other adverse events.
  4. Proteinuria, as demonstrated by a 24 hour protein of (Bullet) 2000 mg. Urine protein will be screened by urine protein-creatinine ratio (UPC). For UPC ratio > 1.0, a 24-hour urine protein will need to be obtained and the level should be < 2000 mg for patient enrollment.
  5. Uncontrolled intercurrent illness including, but not limited to, hypertension (systolic BP > 160, diastolic BP > 100), ongoing or active systemic infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia or psychiatric illness/social situations that would limit compliance with study requirements.
  6. Thrombolytic or treatment-dose anticoagulant use within 10 days prior to first dose with TRC105.
  7. Hemorrhage within 30 days of dosing.
  8. History of peptic ulcer disease or gastritis within 6 months of TRC105 administration, unless patient has received adequate treatment for peptic ulcer disease and has evidence of complete resolution documented by EGD.
  9. QTc > 500 msec.
  10. Known HIV-positive patients are excluded.
  11. History of hypersensitivity reaction to human or mouse antibody products.
  12. Patients with a history of familial bleeding disorders.
  13. Patients with a history of hereditary hemorrhagic telangiectasia (Osler-Weber-Rendu syndrome).
  14. Use of non-steroidal anti-inflammatory drugs (NSAIDs) beginning 14 days prior to the first TRC105 dose, with the exception of aspirin when clinically indicated.
  Contacts and Locations
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, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT01090765

United States, Maryland
National Institutes of Health Clinical Center, 9000 Rockville Pike
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
Principal Investigator: William L Dahut, M.D. National Cancer Institute (NCI)
  More Information

Additional Information:
Responsible Party: National Institutes of Health Clinical Center (CC) ( National Cancer Institute (NCI) ) Identifier: NCT01090765     History of Changes
Other Study ID Numbers: 100062, 10-C-0062
Study First Received: March 19, 2010
Last Updated: October 3, 2014
Health Authority: United States: Federal Government

Keywords provided by National Institutes of Health Clinical Center (CC):
Prostate Cancer

Additional relevant MeSH terms:
Prostatic Neoplasms
Genital Diseases, Male
Genital Neoplasms, Male
Neoplasms by Site
Prostatic Diseases
Urogenital Neoplasms processed this record on November 27, 2014