Phase II, Dose Finding Study of GTx-758

NCT01393119 | Terminated Phase 2 Results

• 1 other identifier: G200710
• Study Type: interventional
• Target: 77
• Locations: 1 country
• Sites: 21

Brief Summary

The purpose of this study is to determine the appropriate loading and maintenance dose of GTx-758 to reach and maintain castration for the duration of the study.

Conditions

Prostate Cancer

Outcome Measures

Primary Outcomes (1)

• Percentage of Subjects That Reach Castration by Day 28

  Percentage of Patients Note: Due to the study being terminated early, per FDA, the secondary assessment of maintenance was unable to be assessed. Hence, all summaries provided are for subjects in the two loading dose groups of 1000 mg BID and 1500mg BID only. PLEASE NOTE: Study was terminated early, per FDA, the secondary assessment of maintenance was unable to be assessed. Hence, the efficacy summary provided are for subjects in the two loading dose groups of 1000 mg BID and 1500mg BID only, poling across maintenance doses within each loading dose. Safety/ITT - 27 and 28 patients, respectively mITT - 18 and 19 patients, respectively Note: mITT includes patients that meet the requirements for the efficacy analyses This format was agreed to by the PRS review team, per email communication on guidnace for presenting the data.

  Day 1-28

Study Arms (4)

1000mg Loading Dose GTx-758 BID and Maintenance Dose 1000mg

EXPERIMENTAL

1000mg Loading Dose GTx-758 BID and Maintenance Dose 1000mg

Drug: GTx-758

1000mg Loading DoseGTx-758 BID and Maintenance Dose 2000mg

EXPERIMENTAL

1000mg Loading Dose GTx-758 BID and Maintenance Dose 2000mg

Drug: GTx-758

1500 mg Loading Dose GTx-758 BID and Maintenance Dose 1000mg

EXPERIMENTAL

1500 mg Loading Dose GTx-758 BID and Maintenance Dose 1000mg

Drug: GTx-758

1500 mg Loading Dose GTx-758 BID and Maintenance Dose 2000mg

EXPERIMENTAL

1500 mg Loading Dose GTx-758 BID and Maintenance Dose 2000mg

Drug: GTx-758

Interventions

GTx-758 DRUG

3-fluoro-N-( 4-fluorophenyl)-4-hydroxy-N-( 4-hydroxyphenyl) benzamide; a nonsteroidal selective estrogen receptor (ER) a agonist

1000mg Loading Dose GTx-758 BID and Maintenance Dose 1000mg; 1000mg Loading DoseGTx-758 BID and Maintenance Dose 2000mg; 1500 mg Loading Dose GTx-758 BID and Maintenance Dose 1000mg; 1500 mg Loading Dose GTx-758 BID and Maintenance Dose 2000mg

Eligibility Criteria

• Age: 45 Years - 80 Years
• Sex: male
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Be between age 45 and 80 years of age
• Be able to communicate effectively with the study personnel
• ECOG is ≤2
• Screening serum total testosterone ≥150 ng/dL
• Have prostate cancer, confirmed by pathology report
• Have not been treated with ADT (chemical or surgical). If a subject has been treated with LHRHa for ≤6 months duration and that treatment was ≥1 years prior to the screening, the subject may be considered for the study.
• Have a clinical indication for the initiation ADT.
• Give written informed consent prior to any study specific procedures
• 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 \[i.e. double barrier method of contraception\], surgical sterilization (vasectomy with documentation of azospermia) and a double barrier method (condom used with spermicidal foam/gel/film/cream/suppository), the female partner uses oral contraceptives (combination estrogen/progesterone pills), injectable progesterone or subdermal implants and a double barrier method (condom used with spermicidal foam/gel/film/cream/suppository).
• If the female partner has undergone documented tubal ligation (female sterilization), a double barrier method (condom used with spermicidal foam/gel/film/cream/suppository) should also be used.
• If the female partner has undergone documented placement of an intrauterine device (IUD) or intrauterine system (IUS), a double barrier method (condom with spermicidal foam/gel/film/cream/suppository) should also be used.

You may not qualify if:

• Known hypersensitivity or allergy to estrogen or estrogen like drugs
• Have, in the judgment of the Investigator, a clinically significant concurrent illness or psychological, familial, sociological, geographical or other concomitant condition that would not permit adequate follow-up and compliance with the study protocol
• Have ALT or AST above 2 times the upper limit of normal (ULN)
• Have alkaline phosphatase greater than 3 times ULN and/or total bilirubin levels above 2 mg/dL at baseline
• Patients cannot have brain or spinal cord metastases
• Patients cannot have or be at high risk for spinal cord compression from bone metastases.
• Received an investigational drug within a period of 90 days prior to enrollment in the study
• Received the study medication previously
• Currently taking testosterone, testosterone-like agents or antiandrogens, including 5-alpha reductase inhibitors (the subject may be considered for randomization after a 4 week washout period prior to randomization)
• Currently taking Saw Palmetto or PC-SPES (the subject may be considered for randomization after a 4 week washout period prior to randomization)
• Have taken diethylstilbestrol or other estrogen products within the previous 12 months prior to randomization into this study
• Have taken body building or fertility supplements within 4 weeks of admission into the study (steroids and steroid like supplements)
• Have a history of cancer other than prostate cancer, superficial bladder cancer (with no recurrence in the last 5 years) and/or non-melanoma carcinoma of the skin.
• QTcB \>480 msec, If the first QTcB reading exceeds 480 msec two additional ECGs are to be performed separated at least 5 min apart, then take the average of the three QTcB readings to determine if the subject satisfies the above criteria. If the average QTcB reading is \> 480 msec then the subject is excluded.

Sponsors & Collaborators

• GTx: lead

Study Sites (21)

GTx Investigative Site

Glendale, Arizona, 85306, United States

Location

GTx Investigative Site

Phoenix, Arizona, 85032, United States

Location

GTx Investigative Site

La Mesa, California, 91942, United States

Location

GTx Investigative Site

San Bernardino, California, 92404, United States

Location

GTx Investigative Site

Aventura, Florida, 33180, United States

Location

GTx Investigative Site

Bradenton, Florida, 34205, United States

Location

GTx Investigative Site

St. Petersburg, Florida, 33710, United States

Location

GTx Investigative Site

Tampa, Florida, 33607, United States

Location

GTx Investigative Site

Roswell, Georgia, 30076, United States

Location

GTx Investigative Site

Jeffersonville, Indiana, 47130, United States

Location

GTx Investigative Site

Shreveport, Louisiana, 71106, United States

Location

GTx Investigative Site

Annapolis, Maryland, 21401, United States

Location

GTx Investigative Site

Towson, Maryland, 21204, United States

Location

GTx Investigative Site

Hamilton, New Jersey, 08690, United States

Location

GTx Investigative Site

Albany, New York, 12208, United States

Location

GTx Investigative Site

Oneida, New York, 13421, United States

Location

GTx Investigative Site

Syracuse, New York, 13210, United States

Location

GTx Investigative Site

Concord, North Carolina, 28025, United States

Location

GTx Investigative Site

Cincinnati, Ohio, 45212, United States

Location

GTx Investigative Site

Columbus, Ohio, 43220, United States

Location

GTx Investigative Site

Bala-Cynwyd, Pennsylvania, 19004, United States

Location

MeSH Terms

Conditions

Prostatic Neoplasms

Interventions

3-fluoro-N-(4-fluorophenyl)-4-hydroxy-N-(4-hydroxyphenyl)benzamide

Condition Hierarchy (Ancestors)

Genital Neoplasms, Male; Urogenital Neoplasms; Neoplasms by Site; Neoplasms; Genital Diseases, Male; Genital Diseases; Urogenital Diseases; Prostatic Diseases; Male Urogenital Diseases

Results Point of Contact

• Title: Mary Breitmeyer
• Organization: Oncternal Therapeutics

mbreitmeyer@oncternal.com

8582092082

Study Officials

• Mitchell Steiner, MD

  GTx

  STUDY DIRECTOR

Publication Agreements

• PI is Sponsor Employee: No
• Restrictive Agreement: No

Study Design

• Study Type: interventional
• Phase: phase 2
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: July 11, 2011
• First Posted: July 13, 2011
• Study Start: August 1, 2011
• Primary Completion: December 1, 2012
• Study Completion: December 1, 2012
• Last Updated: April 22, 2024
• Results First Posted: April 22, 2024

Record last verified: 2024-03

Locations

US (21)