Sodium Selenite and Radiation Therapy in Treating Patients With Metastatic Cancer

Inclusion criteria:

   1. Histologically confirmed adenocarcinoma of the prostate from a prostate biopsy or
   prostatectomy specimen (primary site), or histological confirmation of adenocarcinoma
   /carcinoma in a metastatic site of disease in the setting of elevated PSA and imaging
   consistent with metastatic prostate cancer, or history of prostate cancer with
   documented metastasis, or histologically confirmed other solid tumor malignancy,
   multiple myeloma, or plasmacytoma with pathological confirmation of metastasis

   2. Metastatic cancer requiring palliative radiation therapy

   3. For patients with metastatic prostate cancer, PSA ≥ 2 ng/mL, except for patients who
   have recently started androgen deprivation therapy with PSA < 2 ng/mL

   4. Age ≥18 years

   5. Life expectancy greater than 3 months

   6. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 or Karnofsky
   performance status ≥ 80%

   7. QT interval corrected using Fridericia's method (QTcF) < 460 msec (see Appendix C for
   Fredericia's criteria).

   8. Ability to understand and the willingness to sign a written informed consent document

Exclusion criteria:

   1. Inadequate organ function, as evidenced by any of the following at screening:

      - Absolute neutrophil count (ANC) < 1500/µL

      - Platelet count ≤ 100 x 109/L

      - Serum creatinine > 2.0 mg/dL

      - Total bilirubin > 1.5 x upper limit of normal (ULN)

      - AST, and/or ALT > 2 x ULN

      - Hemoglobin < 9 g/dL

   2. Men with reproductive potential who do not agree to use an accepted and effective
   method of contraception during the study treatment period and for at least 3 months
   after completion of the study treatment

   3. History of other malignancies within 5 years prior to Day 1 except for tumors that in
   the opinion of the investigators have a negligible risk for metastasis or death, such
   as (but not exclusively) adequately controlled basal cell carcinoma, squamous cell
   carcinoma of the skin, or early stage bladder cancer

   4. Current, or recent (within 4 weeks of the first treatment of this study) cytotoxic
   chemotherapy (eg, cisplatin, taxol) or experimental drug therapy, or planned
   participation in an experimental drug study

   5. Uncontrolled intercurrent illness including, but not limited to, ongoing or active
   infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac
   arrhythmia, significant vascular disease (eg, aortic aneurysm, aortic dissection),
   symptomatic peripheral vascular disease, or psychiatric illness/social situations that
   would limit compliance with study requirements

   6. History of myocardial infarction or unstable angina within 6 months prior to study
   enrollment

   7. History of stroke or transient ischemic attack within 6 months prior to study
   enrollment

   8. The subject is known to be positive for the human immunodeficiency virus (HIV) and is
   receiving antiretroviral therapies. Subjects known to be HIV positive who do not
   require antiretroviral therapy will be eligible if they meet other entry criteria

   9. Women who are pregnant or breastfeeding

10. Inability to comply with study and/or follow up procedures