KLK3 and neoplasm: Certain subgroups of patients have been identified with a more favourable prognosis, namely patients with neuro-endocrine tumours (Lenzi et al, 1997), women with lone axillary metastases (Ellerbroek et al, 1990) or diffuse peritoneal carcinomatosis (Strnad et al, 1989), and men with an elevated serum prostate-specific antigen (PSA) or with tumour that stains for PSA (Tell et al, 1985).