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Introduction Lung cancer (LC) and chronic obstructive pulmonary disease (COPD) have the same predisposing factor. We studied lung function on patients diagnosed with LC in our hospital. Methods Patients diagnosed with LC from April 1 st 2009 to September 30 th 2010 were prospectively studied. Clinical data included histology, stage, spirometry, weight lost, body mass index (BMI) and albumin. For statistic analysis, Student t was used for the association analysis, and Pearson correlation indexes depending on the data type. Statistical significance was considered at p Results LC was diagnose in 121 patients. Spirometry was performed in 91 (71 male), which is the group we report here (Mean age 66). Histology types were Adenocarcinoma (39), Squamus cell carcinoma (22) and Small-cell lung cancer (14). 53 patients (58%) were classified as stage IIIb or IV. Mean Spirometric values were: FEV1 71%, FVC 86%, FEV1/FVC 65%. The three Spirometric parameters were smaller in men (no statistical differences with women). 54.8% of patients were diagnosed as COPD, with FEV1/FVC Conclusions - More than half of patients diagnosed with LC in our hospital have also COPD, with similar frequency for all stages. - A weight lost grater than 5%, low BMI indexes, and Albumin low levels correlate with worse lung function.