High Dose Testosterone for ATM CDK12 or CHEK2 Altered Prostate Cancers

  • End date
    Aug 31, 2027
  • participants needed
  • sponsor
    VA Office of Research and Development
Updated on 23 September 2021


This study will determine whether the presence of DNA repair deficiency in the form of alterations in the genes ATM, CDK12 or CHEK2 predicts for a high likelihood of responding to the use of intermittent high dose testosterone. This therapy may result in responses in tumors which are genetically unstable because of DNA repair deficiency and this is a prospective study to test that hypothesis


This is an unblinded, three cohort phase II study evaluating the efficacy of high dose testosterone (BAT) for patients with mCRPC and inactivating mutations in ATM, CDK12 or CHEK2. Patients will receive BAT until disease progression or intolerance, whichever occurs first. Throughout the study, safety and tolerability will be assessed by frequent recording of adverse events, vital signs and safety laboratory assessments. Progression will be evaluated with bone scan, CT of the abdomen/pelvis and PSA as per PCWG3 criteria.

Condition Metastatic Prostate Cancer, Prostate Cancer Metastatic
Treatment High dose testosterone
Clinical Study IdentifierNCT05011383
SponsorVA Office of Research and Development
Last Modified on23 September 2021


Yes No Not Sure

Inclusion Criteria

Signed informed consent form (ICF) providing agreement to adhere to the dosing schedule, report for all trial visits and authorization, use and release of health and research trial information
Male age > 18 years
Histologically or cytologically confirmed adenocarcinoma of the prostate
Ongoing gonadal androgen deprivation therapy with gonadotropin-releasing hormone (GnRH) analogues, antagonists or orchiectomy. Patients who have not had an orchiectomy must be maintained on effective GnRH analogue/antagonist therapy
Castration resistant prostate cancer as defined by serum testosterone < 50 ng/ml and one of the following
PSA level of at least 2 ng/ml that has risen on at least 2 successive occasions at least 1 week apart
Evaluable disease progression by modified RECIST 1.1 (Response Evaluation Criteria in Solid Tumors)
Progression of metastatic bone disease on bone scan with > 2 new lesions
Presence of metastatic disease on bone or CT scan
Patients must have progressed on 1 next-generation AR-signaling inhibitor (e.g. abiraterone, enzalutamide, apalutamide, darolutamide, etc.)
Asymptomatic or minimal cancer related symptoms
Eastern Cooperative Oncology Group (ECOG) Performance Status of < 2
Presence of inactivating mutations in ATM, CDK12 or CHEK2 as determined by a CLIA level assay for DNA sequencing

Exclusion Criteria

Currently receiving active therapy for other neoplastic disorders will not be eligible
Histologic evidence of small cell carcinoma (morphology alone - immunohistochemical evidence of neuroendrocrine differentiation without morphologic evidence is not exclusionary)
Known parenchymal brain metastasis
Liver metastases
Active or symptomatic viral hepatitis or chronic liver disease AST or ALT > 2.5 x ULN or total bilirubin > ULN (unless Gilbert's syndrome is the etiology of hyperbilirubinemia)
Clinically significant heart disease as evidenced by myocardial infarction, or arterial thrombotic events in the past 6 months, severe or unstable angina, or New York Heart Association (NYHA) Class II-IV heart disease or cardiac ejection fraction measurement of <35 % at baseline
Patients with pain attributable to their prostate cancer and requiring the use of opioids
Tumor causing urinary outlet obstruction that requires catheterization for voiding. Patients that require catheterization to void secondary to benign strictures or other non-cancer causes will be permitted to enroll
Presence of dementia, psychiatric illness, and/or social situations limiting compliance with study requirements or understanding and/or giving of informed consent
Any condition(s), medical or otherwise, which, in the opinion of the investigators, would jeopardize either the patient or the integrity of the data obtained
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