OBJECTIVES: To know which attributes related to treatment administration are valued highly in patients with lung cancer through the conjoint analysis. METHODS: A literature review was carried out to identify the attributes related to treatment. There were 6 attributes:1-Time spent in the hospital for treatment administration. 2-Immediate toxicity. 3- Symptoms' control. 4- Confidence with the physician. 5- Survival. 6-Treatment administration. Taking into account these attributes we elaborated 16 hypothetic scenarios. Through interviews with 2nd line lung cancer patients we asked them to order by preferred scenario. RESULTS: 24 patients were interviewed, with a mean (SD) age of 60.8 (11.6) years. 58.3% were men. The mean range by priority order, that is to say, of priority 1 (maximum preference) to priority 16 (minimum preference), we observed that the chosen scenarios in the first place were N (No time spent in the hospital/No immediate toxicity/Moderate symptom control/Quite a lot of confidence with the physician/More than 6 months survival/Oral administration) and H (Spending 2 hours per day during one week in the hospital/No immediate toxicity/Total control of symptoms/Total confidence with the physician/Less than 3 months of survival/Oral administration), whereas the ones less preferred were M (Spending 2 hours per day during one week in the hospital/No immediate toxicity/No symptom control/Any confidence with the physician/From 3-6 month survival/Intravenous administration) and J (No time spent in the hospital/High immediate toxicity/No symptom control/Any confidence with the physician/Less than 6 months of survival/Intravenous administration). The factors that influence more on the treatment preferences were, symptoms' control (31% of the patients), confidence with the physician (21.6%) and immediate toxicity (18.7%). CONCLUSION: Through a conjoint analysis we may conclude that the most important attributes for the patients were symptoms' control followed by confidence with their physician.