<qa>  What is the primary goal of the study?This is a multi-center retrospective observational research study collecting data for participants initiated on docetaxel for the treatment of relapsed non-small cell lung cancer NSCLC up to 6 years before start of data collection and who have completedstopped docetaxel treatment at least 30 days prior to data collection. The primary goal of this study is to describe the percentage of participants with at least one neutropenic sepsis NS episode following initiation of treatment with single-agent docetaxel. Data will be collected until end of docetaxel treatment plus an additional 30 days to allow for presentation with toxicity. 