Digoxin for Recurrent Prostate Cancer
Condition: Prostate Cancer
MeSH terms: Prostatic Neoplasms
Intervention: Digoxin
Intervention description: The participants will take study drug digoxin, which is approved by FDA for the treatment of CHF, 125 or 250 mcg orally daily, titrated to the level of 0.8 - 2 ng/ml for total of 6 cycles (4 weeks/cycle). The lower dose of digoxin (such as 125 mcg/day) will be chosen if serum level reaches 0.8 ng/ml already. Patients may continue another 6 cycles if evident of clinical benefit.
It is possible that some patients may need to receive 500 mcg per day to reach this targeted drug level. No further titration will be allowed beyond this FDA approved digoxin dose.
Intervention MeSH terms: Digoxin
Phase: Phase 2
Study type: Interventional
Primary purpose: Treatment
Intervention model: Single Group Assignment
Masking: None (Open Label)
Enrollment: 16.0
Sex: Male
Minimum age: 18 Years
Healthy volunteers: No
Keywords: Digoxin; Recurrent Prostate Cancer; Prostate Specific Antigen

Summary:

      The purpose of this study is to assess the effectiveness of dioxin on prohibiting prostate
      cancer progression as measured by PSADT (prostate-specific antigen doubling time).
    

Eligibility criteria:

        Inclusion Criteria:

          -  There must be a confirmed biochemical progression. Biochemical progression is defined
             as three rises in PSA levels, with each PSA determined at least 4 weeks apart, and
             each PSA value increase >0.2 ng/ml.

          -  Baseline PSA must be determined within 4 weeks of study entry. At least 3 PSA values
             are necessary prior to the study entry to calculate PSA doubling time (PSADT)
             calculator.

          -  Men with history of radical prostatectomy are required to have baseline PSA >1 ng/ml.
             Men treated with primary radiation therapy are required to have baseline PSA>2 ng/ml
             and greater than 150% rise from postradiation nadir.

          -  PSA doubling time must be between 6 and 24 months.

          -  All treatments including intermittent hormonal therapy must have been discontinued for
             > 6 months prior to study entry.

          -  No clinical or radiological evidence of distant metastases

          -  ECOG < 2 and adequate organ function

          -  Men with history of radical prostatectomy are required to have baseline PSA >1 ng/ml.
             Men treated with primary radiation therapy are required to have baseline PSA>2 ng/ml
             and greater than 150% rise from postradiation nadir

          -  Baseline PSA must be determined within 4 weeks of study entry. At least 3 PSA values
             are necessary to calculate PSA doubling time via PSADT calculator at:
             http://www.mskcc.org/mskcc/applications/nomograms/PSADoublingTime.aspx. PSA doubling
             time must be between 6 and 24 months.

          -  All previous local modalities of treatment, including radiation and surgery, must have
             been discontinued at least 8 weeks prior to treatment in this study. Patients may have
             received prior systemic chemotherapy, hormonal therapy, biologic or vaccine therapy.
             All systemic treatments must have been discontinued for > 6 months prior to study
             entry.

          -  Patients receiving intermittent hormonal therapy for their rising PSA state are
             considered eligible if testosterone level is above 150ng/dl and treatment was
             discontinued > 6 months and agree not to have additional injections while on study
             drug.

          -  No clinical or radiological evidence of distant metastases (excluding prostascint
             scan/PET in absence of radiographic disease in Bone scan, CT scan or MRI if used).
             Lymph node up to 2 cm size is allowed for the study.

          -  ECOG < 2 or Karnofsky Performance status >70% within 14 days before being registered
             for protocol therapy (Appendix B)

          -  Normal organ function with acceptable initial laboratory values:

          -  Absolute neutrophil count ≥ 1 x 109/L

          -  Platelets > 50 x 109/L

          -  Creatinine <1.5 mg/dL

          -  Bilirubin <1.5 X ULN (institutional upper limits of normal)

          -  AST (SGOT) and ALT (SGPT) ≤ 1.5 x ULN

          -  Willingness to use adequate methods of contraception throughout study participation
             and for at least 3 months after completing therapy

        Exclusion Criteria:

          -  Metastatic disease or currently active second malignancy

          -  History of Sinus Node Disease and AV Block, Accessory AV Pathway
             (Wolff-Parkinson-White Syndrome), history of Acute Myocardial Infarction.

          -  Electrolyte imbalance (hypokalemia, hypo- or hypercalcemia, hypomagnesemia)

          -  Severe pulmonary disease and hypoxia

          -  Medical conditions such as uncontrolled hypertension, uncontrolled diabetes mellitus,
             active infectious hepatitis, type A, B or C, hypothyroidism or hyperthyroidism, which
             would, in the opinion of the investigator, make this protocol unreasonably hazardous.

          -  Major thoracic or abdominal surgery within the prior 3 weeks.

          -  Patients with GI tract disease resulting in an inability to take oral medication,
             malabsorption syndrome, a requirement for IV alimentation, prior surgical procedures
             affecting absorption, uncontrolled inflammatory GI disease (e.g., Crohn's, ulcerative
             colitis).

          -  Use of any prohibited concomitant medications: The washout period is at least 2 weeks
             before starting the study.

          -  Insufficient time from last prior regimen or radiation exposure: Systemic therapies
             for prostate cancer within 28 days prior to digoxin; strontium-89 within 12 weeks;
             bicalutamide within 6 weeks.

          -  Persistent Grade >2 treatment-related toxicity from prior therapy

          -  History of any digoxin-related or drug induced anaphylactic reaction

          -  Receipt of another investigational agent within 6 months of study entry. Patient must
             have recovered from all side effects of prior investigational therapy.