J. G. MCVIE The impact of therapy on one subset of lung cancer, the "small cell" type has been significant and lasting. The reality of cure for even a fraction of patients with this disease has caused reverberations in the pathology lab where the responsibili. ' y and challenge of diagnosis of this vital sub group lies. No less dramatic has been the discovery that the cell types of lung cancer have recognisable growth characteristics in serum free culture, they are recognisable by patterns of markers and some produce growth factors which autoregulate their eventual fate. Many of the...