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Mobility for the Disabled

of the upper respiratory tract. So far only 8 additional cases of lung cancer have been discovered, and this number is much too small to permit any valid assessment of the effect on prognosis of the highly intensive methods used by the investigators to detect tumours at the earliest possible stage. For that reason their prediction that whatthey describe as aggressive application of radiological and cytological screening and localization techniques could result in a five-year survival rate of nearly 50%0 for all lung cancers (the corresponding rate when conventional diagnostic methods are used is about 8%) is perhaps open to question. To be fair, they cite a number of imponderable factors which might make the predicted figure difficult to achieve, but curiously enough these do not include the histological classificationofthetumour. The prognosis in oat cell carcinoma, regardless of how or when it is treated, is extremely poor,8 and in Britain at least there is considerable scepticism that earlier diagnosis would substantially improve the prognosis in this type of tumour. That is, however, one of the many important questions to which the Mayo Clinic project may provide an answer when the final results are available.