In addition to Tom's comments, I would add that there have been significant improvements in the treatment of cancer.

Stats from the National Health Service in the UK report that in the early 1970s, just over half of women diagnosed with breast cancer were still alive five years later. Less than a third of men diagnosed with prostate cancer were still alive after five years

The latest figures show that almost two-thirds of men diagnosed with prostate cancer are still alive five years later, twice as many as in the early 1970s. More than three-quarters of women diagnosed with breast cancer are still alive after five years, an increase of 50 percent.

Improvements in survivor rates have been noted for other cancer types as well.