CY503 for the Treatment of Malignant Melanoma Stage IV After Failure of Prior Therapy

Inclusion Criteria:

* Histologically confirmed, unresectable, Stage IV metastatic melanoma
* Failure of prior chemotherapy and / or immunotherapy based regimen
* Measurable disease (based on RECIST criteria)
* Males and females of at least 18 years of age
* Women of reproductive potential (defined as being \<1 year post-menopausal) must have a negative pregnancy test within 3 days prior to randomization; and men and women of reproductive potential must agree to practice an effective method of avoiding pregnancy
* Eastern Cooperative Oncology Group (ECOG) Performance status of 0 or 1.
* Life expectancy of at least 3 months
* WBC ≥ 3,000/mm3, absolute neutrophil count (ANC) ≥ 1,500/mm3, platelet count ≥100,000/mm3
* Bilirubin ≤ 1.5 mg/dL (25.65 μmol/L) (unless due to Gilbert's syndrome in which case the bilirubin should be ≤3.5 mg/dL (59.86 μmol/L)), aspartate transaminase (AST)/alanine transaminase (ALT) ≤ 3 × upper limit of normal (ULN); hepatic alkaline phosphatase ≤ 3.0 × ULN
* LDH ≤ 2.5 upper limit of normal (ULN)
* Serum creatinine ≤ 1.5 mg/dL (132.60 μmol/L), proteinuria \< 2.0 g/24 hr urine
* Patients who have had prior treatment with adjuvant or palliative immunotherapy are eligible provided that therapy ended at least 1 month prior to randomization and all treatment-related toxicities have resolved
* Patients with bone metastasis should be evaluated by the investigator and prior treatment should be finished at least 1 month prior to randomization
* Prior radiotherapy (for palliative care only) is allowed provided there is measurable/evaluable disease outside of the radiation field and all radiation-related toxicities have resolved; if there is only one measurable lesion it may not have been irradiated unless subsequent progression has been documented
* Patients who had prior major surgery are eligible if at least 4 weeks have passed since their surgery and all surgical wounds have healed prior to randomization and at least one measurable tumor is present
* All toxicities related to prior adjuvant therapy must have resolved
* Written informed consent

Exclusion Criteria:

* Pregnancy or nursing
* Any concurrent chemotherapy, radiotherapy, immunotherapy, biologic or hormonal therapy for treatment of cancer
* Current or planned participation in a research protocol
* Received an investigational agent within 4 weeks prior to randomization
* Brain metastases or primary brain tumors, symptomatic pleural effusion or ascites requiring paracentesis
* Ocular melanoma
* History of prior malignancies within the past 5 years other than non-melanomatous skin cancers that have been controlled, carcinoma in situ of the cervix, T1a or b prostate cancer noted incidentally during a transurethral resection of prostate (TURP) with prostate-specific antigen (PSA) values within normal limits since TURP, or superficial bladder cancer
* Any evidence of or history elicited by the investigator of symptomatic cerebrovascular events within 6 months prior to randomization; or any history or evidence of pulmonary embolism or thrombophlebitis requiring anticoagulant therapy
* Any current evidence of hematemesis, melena, hematochezia, or gross hematuria
* Elective surgery planned during the study period through 30 days after the last dose of CY-503
* History of hypersensitivity to previously administered mistletoe
* Prior therapy with mistletoe
* History of primary immunodeficiency
* Known human immunodeficiency virus (HIV) or known active viral hepatic infections
* Prior treatment with CY-503
* A general medical or psychological condition or behaviour in the opinion of the investigator, might not permit the patient to complete the study or sign the informed consent.