High Dose Testosterone for ATM, CDK12 or CHEK2 Altered Prostate Cancers

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. * Histo…