Items I found when exploring cancer.
If the tumor shrinks quickly from chemotherapy or radiation therapy, the ideal healthy response of the body to controlling cancer does not have a chance to occur. 
Pancreatic cancer has been called a "silent" disease because early pancreatic cancer usually does not cause symptoms. 
Cancer can be the result of a genetic predisposition that is inherited from family members. 
Malignant cancer can only be treated by agents similar to those that initiate. 
Cancer is not just one disease but many diseases. 
- Cancer Truth | Alternative Cancer Treatments
- Cancer (Malignant Tumor) Types, Facts, Survival Rates, Statistics and Information on MedicineNet.com
- What is Cancer? What Causes Cancer?
- CANCER DEATH
- What Is Cancer? - National Cancer Institute