We report on a 45-year old patient who was treated for IgA-Nephritis for 9 months. During treatment he developed coughing and dyspnoea which led to diagnose a central stenosing NSCLC at the tracheobronchial angle. Cancer treatment by x-ray showed a good response, e.g. significant reduction of cancer volume and a remarkably improved renal function. In the course of tumour progression (3 months after initial treatment) retention parameter deteriorated again and the patient needed to be dialysed. Palliative laser therapy had no influence on renal function. The close linkage between tumour regression and the extent of IgA nephritis suggest that the preceding IgA nephritis was paraneoplastic and hence a primary symptom of the NSCLC.
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