A phase II study of the synthetic polyelectrolyte Carbetimer 6500 mg/m
2 IV daily for five days every 21-day cycle was conducted in patients
with metastatic melanoma. No responses were seen in 18 evaluable patie
nts. Two patients had stable disease for five months. Toxicity was gen
erally manageable and included mild hyperphosphatemia, mild proteinuri
a, fatigue, pain at the injection site, and nausea. Carbetimer is inac
tive in metastatic melanoma at this dose and schedule.