The risk of death from cancer is usually greatest in the first few years. Many studies have focused on five-year survival rates at diagnosis, but these numbers do not apply to individuals who have survived for several years after initial treatment.
Larry F. Ellison and colleagues at Statistics Canada and associated organizations performed an analysis of conditional survival estimates for 26 common types of cancer. The data are from the July 2010 version of the Canadian Cancer Registry.
Pancreatic cancer shows the most improvement in prognosis with time. At the time of diagnosis, only 6 percent of patients can expect to survive for five years. For those who do survive for five years, 88 percent can expect to survive for another five years.
Chronic lymphocytic leukemia shows the least improvement in prognosis with time. At the time of diagnosis, 77 percent can expect to survive for five years. Those who make it to the five-year mark have a 78 percent chance of survival for another five years. Other cancers with little improvement in prognosis with time are breast cancer, larynx cancer, and multiple myeloma.
Ellison listed seven cancers that have at least a 95 percent chance of five-year survival for those who have already survived five years past diagnosis:
4. Skin melanoma
5. Uterine (corpus)
6. Hodgkin lymphoma
Breast cancer is close, with a 93 percent chance of five-year survival after five years. All the statistics are presented as relative survival rates, which means they are compared to the general population with no cancer diagnosis.
All cancers studied except multiple myeloma had five-year survival rates of at least 75 percent after five years. The observed trends were similar for males and females. Ellison reported that the Canadian results are similar to U.S. data from the Surveillance, Epidemiology and End Results (SEER) study.
Cancer types with five-year survival rates of 90 to 94 percent after five years are those affecting the breast, bladder, kidney, soft tissue, rectum, and stomach, as well as leukemia, other than chronic lymphocytic leukemia.