Post by Melanie Thomas, MD
The National Institutes of Health (NIH) this week released its Annual Report to the Nation on the Status of Cancer 1975-2006. The report contains both good news and some less encouraging news, but all of the finds are important.
The study examines trends in the incidence (number of new cases each year of a particular cancer, per 100,000 individuals) and the mortality rate (number of individuals who die of a particular cancer, per the incidence of that cancer) of the top 15 cancers that affect Americans. The good news is that incidence and mortality from all cancers combined has steadily declined during the 31 years covered in the report.
Most of the decreases took place from 1999-2006, with new diagnoses declining 1 percent per year and death rates declining 1.6 percent per year. Most of these decreases happened in the most common cancers, which include lung, prostate and colorectal cancers in men; and breast, lung and colorectal cancers in women. The report also contains an in-depth analysis of the status of colorectal cancer in the United States.
Findings show that significant declines in colorectal cancer have occurred in the most recent decade (1997-2006), and that much of this progress is attributable to increased screening. From 1975-2000, colorectal cancer incidence fell by 22 percent, and deaths fell by 26 percent. This improvement is very encouraging, and gives strong support to colorectal cancer screening efforts. It should be noted however, that the incidence of new colon cancer is increasing in men and women under age 50.
While parts of this report are certainly encouraging, it is important to note that the rates of several less common but very difficult to treat cancers, specifically primary liver cancer, melanoma, and kidney cancer, continue to increase, at annual rates of 3.6 percent , 3.1 percent, and 1.8 percent respectively. The agencies compiling the report were the National Cancer Institute, North American Association of Central Cancer Registries, the American Cancer Society, and the Centers for Disease Control and Prevention. For more information and the full report, visit http://www.nih.gov/news/health/dec2009/nci-07a.htm