PSA expression was for example found in 9%–60% breast cancers [33–38], in 6 of 11 pleomorphic adenomas of the salivary gland and in one case of salivary duct carcinoma [39, 40], in all 56 cases of normal salivary gland [41], in 100% of 62 samples obtained from normal pancreas and normal salivary glands, pleomorphic adenoma, adenocarcinoma and Warthin’s tumor [42], in individual cases of paraurethral adenocarcinoma [43–47] and urinary bladder cancer [48] as well as in 22 of 40 (55%) of malignant melanomas [49]. The gene discussed is KLK3; the disease is breast carcinoma.