Calcitonin elevation in small cell lung cancer without ectopic production
| Autor: | Richard H. Snider, Kenneth L. Becker, David Bliss, Ruby Phelps, Kenneth Melby, Daniel C. Ihde, David Venzon, Jeanne M. Rushin, Michael J. Kelley, Bruce E. Johnson |
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| Rok vydání: | 1994 |
| Předmět: |
Pulmonary and Respiratory Medicine
Adult Calcitonin Male Pathology medicine.medical_specialty Lung Neoplasms Time Factors Restriction Mapping Urine Critical Care and Intensive Care Medicine Sensitivity and Specificity Ribonucleases parasitic diseases Tumor Cells Cultured Medicine Humans RNA Messenger Carcinoma Small Cell Aged Antiserum biology business.industry Smoking Case-control study Discriminant Analysis Nuclease protection assay Radioimmunoassay Middle Aged respiratory tract diseases Gene Expression Regulation Neoplastic Logistic Models Polyclonal antibodies Case-Control Studies biology.protein Immunohistochemistry Female business |
| Zdroj: | American journal of respiratory and critical care medicine. 149(1) |
| ISSN: | 1073-449X |
| Popis: | To determine the relative contribution of ectopic calcitonin (CT) production versus nonectopic secretion of CT in patients with small cell lung cancer (SCLC), serum and urine immunoreactive CT (iCT) levels of 86 different subjects were measured by radioimmunoassay (RIA) using two polyclonal antisera (Ab3b and Ab4). The subjects included 49 previously untreated patients with SCLC, 17 smokers, and 20 nonsmokers. Serum and urine iCT values were highest in the patients with SCLC, intermediate in the smokers, and lowest in the nonsmokers (p < 0.0003). Sixteen of the 49 patients with SCLC had tumor cell lines available for determination of CT mRNA expression by RNase protection assay (RPA) and iCT production by RIA. CT mRNA was detected in nine of 16 subjects and iCT in eight of 16. The tumor cell lines of seven patients had undetectable CT by both RPA and RIA, and of these, five had elevated urine or serum iCT values compared with those of nonsmokers, and two had levels above all values in the smoker group. Immunohistochemical staining of formalin-fixed, paraffin-embedded tumor samples detected iCT in two of four tumors from patients whose tumor cell lines had CT mRNA by RPA and iCT by RIA, but in none of six whose tumor cell lines had undetectable CT mRNA. Thus, increased iCT values in some patients with SCLC are likely due to sources other than CT production by tumor cells. |
| Databáze: | OpenAIRE |
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