SummaryThis statistic study confirms once more the powerlessness of our therapeutic means in treatment of the majority of bronchopulmonary neoplasms. However, this is mainly due to the delayed diagnosis of the disease. On the other hand, it ensues evidently from this study, that diagnosis could have been far more precocious in a great number of the patients. The reasons of this delayed diagnosis are multiple; the authors chiefly retained the following reasons :1°The very common symptomatology of the disease at its beginning, and the public’s ignorance concerning the frequency of broncho-pulmonary neoformations, have too often induced the patients to consult their physician only after several months of disease.2°The carelessness of too many physicians in regard of the very imprecise symptoms of the beginning disease, and the negligence of a first-sight radiologic examination, are other reasons of important delay in diagnosis.In fact, every respiratory symptom occurring at cancer-age, whose etiology is not evident, requires immediately the radiologic inspection of the chest.3°Complex radiological pictures often falsely interpretated by certain radiologists, have also delayed diagnosis in a certain number of patients.We should like to point out that the physician and the specialist of respiratory system must, together, and continuously, proceed with their investigations in cases suspect of bronchopulmonary neoformation, and that, until they have reached a diagnosis that is a certitude, which is almost always possible.In every ease that is not contraindicated by the presence of clinical evident metastasis, an exploratory thoracotomy followed if possible by a pneumectomy, should then be attempted.