Hypouricemia and malignant neoplasms. A new case of xanthinuria

An 80-year-old man with squamous cell carcinoma of the parotid gland was noted to have persistent severe hypouricemia with serum uric acid values of 0.5 to 1.0 mg/dL. Urinary excretion of uric acid was very low and a diagnosis of xanthinuria was made.