Symptomatic porphyria secondary to hepatocellular carcinoma.

A 58-year-old woman gave a 6-month history of porphyria-like photosensitivity. Fractioned porphyrin analysis by high performance liquid chromatography revealed elevated concentrations of all urinary porphyrins and faecal protoporphyrin. Hepatocellular carcinoma had developed in an otherwise normal liver. Tumour tissue fluoresced strongly under fluorescence microscopy, exhibiting elevated activity of three haem-biosynthetic enzymes, delta-aminolevulinic acid (ALA) synthase. ALA dehydratase and porphobilinogen deaminase. This patient did not satisfy any of the criteria for inherited porphyria. The patient's symptoms were relieved after excision of the liver tumour. This strongly suggests that excessive porphyrin synthesis originated from the tumour tissue. Primary porphyria-like photosensitivity occurs as a paraneoplastic phenomenon, secondary to hepatocellular carcinoma.