A Randomized Phase 2 Trial of Ascorbic Acid in Combination With Docetaxel in Men With Metastatic Prostate Cancer

Condition: Hormone-Resistant Prostate Cancer, Metastatic Prostate Carcinoma, Stage IV Prostate Cancer

Study Type: Interventional

Clinical Trials Identifier NCT 8-digits: NCT02516670

Sponsor: Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins

Phase: Phase 2


  • Age: minimum 18 Years maximum N/A
  • Gender: Male

Inclusion Criteria:

  • Have metastatic castration-resistant prostate cancer (prostate cancer progressing despite castrate levels of testosterone [< 50 ng/dL] using standard measures of progression defined by Prostate Cancer Working Group 2), are chemo-na├»ve for metastatic castration-resistant prostate cancer (mCRPC); patients must have symptomatic disease or visceral metastases or otherwise be eligible for docetaxel treatment per investigator judgment (e.g. for progression on imaging or rapidly rising PSA despite 2nd line hormonal treatment);
  • Note: Six cycles of prior docetaxel are allowed in hormone-sensitive disease, per Eastern Cooperative Oncology Group (ECOG) 3805 data and have been off of docetaxel for at least 12 months
  • Have a pathological diagnosis of prostate carcinoma
  • Patients may be receiving continuous hormonal ablation with surgical or medical castration with baseline testosterone < 50 ng/dL
  • Patient may be receiving bone targeted agents
  • Have evaluable disease by Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 and/or Prostate Cancer Working Group 2 (PCWG2) criteria
  • Have ECOG performance status 0-1
  • Have an estimated life expectancy > 4 months
  • Absolute neutrophil count >= 1500/mm^3
  • Platelets >= 100,000/mm^3
  • Hemoglobin >= 9 g/dL
  • Total bilirubin =< 1.0 upper limit of normal (ULN)
  • Aspartate aminotransferase (AST)(serum glutamic oxaloacetic transaminase [SGOT])/alanine aminotransferase (ALT)(serum glutamate pyruvate transaminase [SGPT]) =< 2.5 x ULN
  • Creatinine =< 1.6 mg/dl (for patients with > 1.6 mg/dl, calculated or measured creatinine clearance must be >= 55 mL/minute [Cockcroft-Gault])
  • Men of reproductive potential and those who are surgically sterilized (i.e., postvasectomy) must agree to practice effective barrier contraception that has an expected failure rate of < 1% during and for 30 days after discontinuation of study treatment
  • If condoms are used as a barrier contraceptive, a spermicidal agent should be added to ensure that pregnancy does not occur
  • Have the ability to understand, and have given written informed consent before performance of any study-related procedure not part of normal medical care, with the understanding that consent may be withdrawn by the subject at any time without prejudice to future medical care

Exclusion Criteria:

  • Have had known active central nervous system (CNS) metastases and/or carcinomatous meningitis; subjects with previously treated brain metastases may participate provided they are stable (without evidence of progression by imaging for at least four weeks prior to the first dose of trial treatment and any neurologic symptoms have returned to baseline), have no evidence of new or enlarging brain metastases, and are not using steroids for CNS involvement for at least one week prior to trial treatment; patients with primary brain tumors are not eligible; however, as patients are completing abiraterone therapy, they will be allowed to continue up to 10 mg/day of prednisone
  • Have had prior chemotherapy for metastatic disease in castration-resistant prostate cancer (prior chemotherapy for hormone-sensitive disease, more than twelve months prior to registration, is acceptable)
  • Have had had surgery within four weeks of dosing of investigational agent, excluding minor procedures (dental work, skin biopsy, etc.), celiac plexus block, and biliary stent placement
  • Have had palliative radiation or biological cancer therapy within 2 weeks prior to the first dose of study drug
  • Have received other investigational drugs within 28 days prior to enrollment
  • Is expected to require any other form of systemic or localized antineoplastic therapy while on study
  • Patients who require frequent (several times a day) monitoring of their blood glucose or patients who have recently been hospitalized for glucose control
  • Are being treated with anticoagulation therapy (aspirin and nonsteroidal anti-inflammatory drugs [NSAIDS] are allowed)
  • The subject requires concomitant treatment with the following inhibitors of cytochrome P450, family 3, subfamily A, polypeptide 4 (CYP3A4):
  • Antibiotics: clarithromycin, erythromycin, telithromycin, troleandomycin
  • Antifungals: itraconzaole, ketoconazole, voriconazole, fluconazole, posaconazole
  • Antidepressants: nefazodone
  • Antidiuretic: conivaptan
  • Anti-retrovirals: delaviridine or protease inhibitors (ritonavir, indinavir, lopinavir/ritonavir, saquinavir, nelfinavir) or cobicistat-boosted antiretrovirals
  • Gastrointestinal (GI): cimetidine, aprepitant
  • Hepatitis C: boceprevir, telaprevir
  • Miscellaneous: Seville oranges, grapefruit, or grapefruit juice and/or pummelos, star fruit, exotic citrus fruits, or grapefruit hybrids
  • Have uncontrolled intercurrent illness, including but not limited to ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that would limit compliance with study requirements
  • Has glucose-6-phosphate dehydrogenase (G6PD) deficiency
  • Have end stage renal disease
  • Has history of calcium oxalate stones
  • Has history of iron overload
  • Have a known history of human immunodeficiency virus (HIV) (HIV 1/2 antibodies)
  • Have a know active uncontrolled hepatitis B, or hepatitis C infection

View trial on ClinicalTrials.gov

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