title: Serum ribonuclease activity in cancer patients.
abstract: A study was made of the levels of ribonuclease (RNase) in human serum, using 2 independently collected banks of samples from Scripps Clinic and Research Foundation and the Mayo Clinic, each bank representing more than 100 individuals. These serum samples originated from a cross-section of normal individuals, smokers, patients with benign tumours, and patients with a variety of neoplasms. Elevated levels of serum RNase occurred in 68% of the samples from individuals with malignant disease. Elevated levels also occurred in 24% of the samples from individuals with benign tumours and in 38% of the smoker controls from the Mayo Clinic serum bank. Using ion-exchange chromatography, pooled sera from normal individuals and cancer patients were fractionated by differential salt elution. Each pool showed 2 distinct peaks of RNase activity, and both peaks were elevated to the same degree in the cancer serum pools. Similar results were obtained after thin-layer-gel isoelectric focusing of both normal and cancer sera; no new species of RNase could be detected in the sera of patients with malignant diseases. The results suggested a generalized nonspecific increase in serum RNase in these patients.
mesh_terms: D002848:Chromatography, DEAE-Cellulose; D004796:Clinical Enzyme Tests; D006801:Humans; D007525:Isoelectric Focusing; D009369:Neoplasms / Q000175:diagnosis / Q000201:enzymology*; D012260:Ribonucleases / Q000097:blood*; D013223:Statistics as Topic
chemical_list: D012260:Ribonucleases