Adenocarcinoma: Lung adenocarcinoma starts in cells in the lung that make mucus, called epithelial cells. Epithelial cells line the surface of the lungs. Adenocarcinoma is the most common type of non-small cell lung cancer.

There are three main types of NSCLC: adenocarcinoma of the lung, squamous cell, and large-cell undifferentiated carcinoma. Adenocarcinoma is the most common form of lung cancer, accounting for 30% of all cases overall and about 40% of all non-small cell lung cancer occurrences.

Stage 1 adenocarcinoma: The cancer is small and contained to local tissue, and has not spread to nearby lymph nodes or to other organs. Stage 2 adenocarcinoma: The cancer cells have more deeply spread into nearby tissue and possibly into local lymph nodes, but not to distant organs.

SCLC is more aggressive than NSCLC and often spreads to other parts of your body. Here are the facts about SCLC and NSCLC and how they differ. What Is Small-Cell Lung Cancer? Small-cell lung...

Adenocarcinoma: A form of NSCLC often found in an outer area of the lung. It develops in the cells of epithelial tissues, which line the cavities and surfaces of the body and form glands. Squamous cell carcinoma: A form of NSCLC usually found in the center of the lung next to an air tube (bronchus).