Adenocarcinoma is a type of cancer that originates in glandular tissue, which is responsible for producing fluids and secretions. This cancer can occur in various organs, including the lungs, prostate, pancreas, and breast, among others. Adenocarcinomas are characterized by the abnormal growth of cells that can invade nearby tissues and spread to other parts of the body. Early detection and treatment are crucial for improving prognosis and outcomes.