Tissue polypeptide antigen (TPA) as a predictor for genitourinary cancers and their metastases

Tissue polypeptide antigen (TPA) is an oncofetal antigen found in human malignant tumors of various origins. We used radioimmunoassay to determine TPA levels in a total of 150 serum samples from 88 patients with different types of genitourinary cancers. The serum TPA level among cancer patients of all stages combined was higher than in normal healthy controls (p less than 0.05). However, when the patients with metastases were excluded from the analysis, the TPA titer was not significantly different from those of the normal controls. The difference in serum TPA between patients with local disease and patients with metastatic lesions was highly significant (p less than 0.0001). The serum TPA levels were significantly decreased in patients who responded to treatment; the levels were significantly increased in those who progressively became worse.