RT Journal Article SR Electronic T1 Inappropriate antidiuretic hormone secretion in oat-cell carcinoma of bronchus JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 640 OP 642 DO 10.1136/thx.27.5.640 VO 27 IS 5 A1 A. H. G. Munro A1 G. K. Crompton YR 1972 UL http://thorax.bmj.com/content/27/5/640.abstract AB A patient with hyponatraemia associated with an oat-cell carcinoma of the bronchus is described. Treatment with intermittent large doses of cyclophosphamide intensified the hyponatraemia. An explanation of this previously undescribed phenomenon is suggested.