Chronic lymphocytic leukemia (CLL) and small lymphocytic lymphoma (SLL) are the same disease. It is a slow-growing cancer that develops when lymphocytes, a mature type of white blood cell, do not fully develop. These abnormal lymphocytes do not fight infection well and crowd out healthy blood cells.
Head and neck tumors are those that grow in the nose, sinuses, mouth (oral cavity), throat (pharynx), voice box (larynx), salivary glands, lymph nodes in the neck, thyroid gland or parathyroid glands. They can be cancerous or noncancerous (benign).
The pancreas is an organ that helps the body digest food and use it as energy. The two main types of pancreatic cancer are exocrine pancreatic cancer, which is the most common, and endocrine pancreatic cancer.