One of the most insidious aspects of cancer is the way it grows. As the tumor outgrows the original organ, pieces of malignant tissue often break off (metastasize) and enter the bloodstream or lymph system. The cancer cells can then attach themselves to other vulnerable organs and form new tumors. Thus a patient with pancreatic cancer may eventually suffer from lung, brain, kidney, breast or colon cancer as well. This is why cancer specialists (oncologists) place so much emphasis on containing malignant tumors to their place of origin.

Treatment for cancer ranges from rounds of powerful chemicals to focused burst of radiation to complete surgical removal of the tumor and surrounding tissue. Each treatment type brings a certain level of risk and pain to the patient, but cancerous cells left untreated will almost inevitably choke off vital organs and circulation. Chemotherapy introduces strong medicines which target fast-growing cells, but this also includes normal events such as hair growth and digestion. Radiation treatments use heat energy to literally burn off malignant cells, but healthy tissue is also damaged. Surgical removal can lead to a permanent recovery, but undetected malignant cells may have already metastasized to other organs or be jarred loose by the surgery itself.

Curing cancer has been a major goal of medical researchers for decades, but development of new treatments takes time and money. Already there are many forms of cancer which are no longer considered untreatable. Some cancers, such as leukemia (blood cancer), can actually stop growing as suddenly as they started. This is called remission, and is often seen as a tremendous blessing for patients who have fought their conditions for years. Science may yet find the root causes of all cancers and develop safer methods for shutting them down before they have a chance to grow or spread.