A group of Portuguese researchers has found significant differences in clinical particularities and survival between smokers and non-smokers who develop NSCLC.
According to research presented at ERS 2015, scientists analyzed 904 Portuguese smokers and 504 Portuguese non-smokers with NSCLC and found that the non-smoking patients were more likely to be women, with adenocarcinoma (the most common form of NSCLC), with less COPD, heart disease, previous cancer of the larynx and weight loss.
They also found that non-smokers had a significant longer survival after diagnosis: 51 months as opposed to 25 months for smokers.
“In Portugal, information on the differences in the risk and survival between smokers and non-smokers with NSCLC, has been very limited up to now,” said Dr Cátia Saraiva, from the Department of Pulmonology, of Portuguese Institute of Oncology, Lisbon, Portugal. “We believe that the differences we found between the two groups will help improve diagnosis, and prompt investigators to try to find out why these differences occur.”
“This is the first study to look at the differences in symptoms and prognoses in in non-smokers and smokers with NSCLC in Europe, says Dr Saravia. “We believe that we have made a major contribution towards improving diagnosis and treatment for these patients.”
The researchers suggest further prospective studies in order to find different prognostic factors in the areas of ageing, human pre-disposition and life-style between the two groups.
“In the non-smoking group, we found professional exposure to carcinogens in 9%, a family history of lung cancer in 5%, and a previous cancer diagnosis in 6%. Additionally, 18% had high blood pressure,” Dr Saraiva said.
The non-smoking group were often diagnosed at an advanced stage of disease, 59% of them at stage IV, where the cancer had already spread to other parts of the body, namely different areas in the same lung, the opposite lung, bones, and brain.
“It seems plausible that the non-smoking Portuguese population is not aware of lung cancer risks. But we need to confirm our results through population-based studies, before public education issues can be addressed,” says Dr Saravia.