Non-small-cell lung carcinoma (NSCLC) is any type of epithelial lung cancer other than small cell lung carcinoma (SCLC). NSCLC accounts for about 85% of all lung cancers. As a class, NSCLCs are relatively insensitive to chemotherapy, compared to small cell carcinoma.
Stage 3B non-small cell lung cancer is considered advanced lung cancer along with stage 4, and though it is not usually curable, it is treatable. About 20 percent of people have stage 3B lung cancer at the time of diagnosis, with another 40 percent of individuals having already progressed to stage 4.