Study of the Effect of GTx-758 on Serum PSA and Testosterone in Men With Prostate Cancer

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. Read our disclaimer for details. Identifier: NCT01615120
Recruitment Status : Unknown
Verified February 2016 by GTx.
Recruitment status was:  Active, not recruiting
First Posted : June 8, 2012
Last Update Posted : February 9, 2016
Information provided by (Responsible Party):

Brief Summary:
Protocol G200712 is a Phase II, exploratory study to assess the effects of GTx-758 on serum prostate specific antigen (PSA) response ans serum PSA progression in men with Metastatic Castration Resistant Prostate Cancer (mCRPC) on Androgen Deprivation Therapy (ADT) with luteinizing hormone-releasing hormone (LHRH) agonists, LHRH antagonists, or orchidectomy. This study will also assess the venous thromboembolism (VTE) risk of lower doses of GTx-758.

Condition or disease Intervention/treatment Phase
Prostate Cancer Drug: GTx-758 125 mg Drug: GTx-758 250 mg Phase 2

Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 76 participants
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Phase II, Open Label Study of the Effect of GTx-758 as Secondary Hormonal Therapy on Serum PSA and Serum Free Testosterone Levels in Men With Metastatic Castration Resistant Prostate Cancer Maintained on Androgen Deprivation Therapy
Study Start Date : July 2012
Estimated Primary Completion Date : March 2016
Estimated Study Completion Date : March 2016

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Prostate Cancer
U.S. FDA Resources

Arm Intervention/treatment
Experimental: GTx-758 125mg
one GTx-758 tablet orally administered daily
Drug: GTx-758 125 mg
One 125 mg tablet once a day
Experimental: GTx-758 250 mg
two GTx-758 tablets orally administered daily
Drug: GTx-758 250 mg
two 125 mg tablets once daily

Primary Outcome Measures :
  1. Decline in Serum PSA [ Time Frame: 120 days ]
    The proportion of subjects with a 50% decline from baseline in serum PSA (confirmed by a second serum PSA assessment 30 days later) by Day 90 (with follow up confirmation by Day 120)

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Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   Male
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Be over age 18 years
  • Be able to Communicate effectively with the study personnel
  • Have histologically confirmed prostate cancer
  • Have castration resistant prostate cancer patients with radiographic evidence of metastatic disease (T any - N any - MI)
  • ECOG performance status of 0 to 2
  • Have been treated with ADT (chemical or surgical) for at least 6 months
  • Have a castrate level of serum total testosterone (< 50ng/dL)
  • Have a history of serum PSA response on ADT. A serum PSA response is an undetectable level of serum PSA (≤ 0.2/mL) or at least a 90% reduction in serum PSA from the serum PSA value prior to the initiation of treatment to < 10ng/mL
  • Have a rising serum PSA on two successive assessments at least 2 weeks apart and serum PSA levels ≥ 2ng/mL or > 2 ng/mL and a 25% increase above the nadir from the ADT.
  • Be continued on ADT throughout this study
  • give written informed consent prior to any study specific procedures
  • subjects must agree, if not already on anticoagulation therapy or aspirin, to take 81 mg aspirin daily throughout the duration of their participation in this study and for 30 days after completion of dosing with GTx-758.
  • Subjects must agree to use acceptable methods of contraception:
  • If their female partners are pregnant or lactating, acceptable methods of contraception from the time of the first administration of study medication until 3 months following administration of the last dose of study medication must be used. Acceptable methods are: condom used with spermicidal foam/gel/film/cream/suppository. If the subject has undergone surgical sterilization (vasectomy with documentation of azospermia), a condom with spermicidal foam/gel/film/cream/suppository should be used.
  • If the male subject's partner could become pregnant, use acceptable methods of contraception from the time of the first administration of study medication until 3 months following administration of the last dose of study medication.Acceptable methods of contraception are as follows: condom with spermicidal foam/gel/film/cream/suppository [i.e., barrier method of contraception], surgical sterilization (vasectomy with documentation of azospermia) and a barrier method {condom used with spermicidal foam/gel/fil/cream/suppository}, the female partner uses oral contraceptives (combination estrogen/progesterone pills), injectable progesterone or subdermal implants and a barrier method {condom used with spermicidal foam/gel/film/cream/suppository}.
  • If the female partner has undergone documented tubal ligation (female sterilization), a barrier method {condom used with spermicidal foam/gel/film/cream/suppository} should be used
  • If the female partner has undergone documented placement of an intrauterine device (IUD) or intrauterine system (IUS), a barrier method {condom with spermicidal foam/gel/film/cream/suppository} should also be used.

Exclusion Criteria:

  • Known hypersensitivity or allergy to estrogen or estrogen like drugs
  • Need for urgent chemotherapy, radiation therapy or surgical intervention for prostate cancer in the opinion of the investigator;
  • Any disease or condition (medical or surgical) which might compromise the hematologic, cardiovascular, endocrine, pulmonary, renal, gastrointestinal, hepatic, or central nervous system; or other conditions that may interfere with the absorption, distribution, metabolism or excretion of study drug, or would place the subject at increased risk
  • Subjects with a personal history of abnormal blood clotting or thrombotic disease (venous or arterial thrombotic events such as history of stroke, deep vein thrombosis (DVT), and or pulmonary embolus (PE)).
  • Any subjects, as determined by a central laboratory, with

    1. a modified activated protein C reaction ratio ≤ 2.5 and a Factor V Leiden gene mutation,
    2. an antithrombin level below the lower limit of the normal range,
    3. an antiphospholipid antibody level that is indeterminate, positive, or outside the normal range,
    4. or a prothrombin gene mutation
  • Symptomatic congestive heart failure (NYHA Class III - IV), unstable angina pectoris, cardiac arrhythmia, or history of atrial fibrillation
  • The presence of consistently abnormal laboratory values which are considered clinically significant. In addition, any subject with liver enzymes (ALT or AST) above 2 times the upper limit of normal, total bilirubin above 2 times the upper limit of normal, or serum creatinine above 1.5 times the upper limit of normal will NOT be admitted to the study.
  • Received an investigational drug within a period of 90 days prior to the enrollment in the study.
  • Received the study medication GTx-758 previously;
  • Currently taking testosterone, testosterone like agents, 5a-reductase inhibitor (finasteride, dutasteride),or antiandrogens (bicalutamide, flutamide or nilutamide). Subjects taking a 5a-reductase inhibitor or one of these antiandrogens may be eligible if the subject undergoes a 6 week washout period after stopping therapy. The subject must have at least two rising serum PSA levels at least 2 weeks apart after therapy with these 5a-reductase inhibitor or these antiandrogens have been stopped (antiandrogen withdrawal)and complete the 6-week washout period to be eligible;
  • Have previously taken or are currently taking diethylstilbestrol, other estrogens, abiraterone or ketoconazole or any other inhibitor of CYP17 (17a-hydroxylase/C17,20-lyase);
  • Currently having radiation therapy to prostate for cancer control (radiation to bone to relieve pain is acceptable)
  • Have previously taken or are currently taking enzalutamide;
  • Have previously received cytotoxic chemotherapy for prostate cancer;
  • Recent hospitalization (within 30 days of screening);
  • Recent surgery (within 30 days of screening);
  • Have taken body building or fertility supplements within 4 weeks of admission into the study;
  • Have been previously diagnosed or treated for active cancer (other than prostate cancer or non-melanoma skin cancer)within the previous five years;
  • Have a BMI > 35.

Information from the National Library of Medicine

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 identifier (NCT number): NCT01615120

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Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: GTx Identifier: NCT01615120     History of Changes
Other Study ID Numbers: G200712
First Posted: June 8, 2012    Key Record Dates
Last Update Posted: February 9, 2016
Last Verified: February 2016

Additional relevant MeSH terms:
Prostatic Neoplasms
Genital Neoplasms, Male
Urogenital Neoplasms
Neoplasms by Site
Genital Diseases, Male
Prostatic Diseases
Testosterone enanthate
Testosterone undecanoate
Testosterone 17 beta-cypionate
Hormones, Hormone Substitutes, and Hormone Antagonists
Physiological Effects of Drugs
Antineoplastic Agents, Hormonal
Antineoplastic Agents
Anabolic Agents