( Jieyang website promotion www.wji.cc )"For any cancer screening test, reducing the mortality from cancers is the holy grail," said Dr. Gina Caccavo from Knight Cancer Institute of Gastrointestinal Tumors at Oregon Health & Science University in the United States who was not involved in this study. "This study shows that if polyps are removed, there is a reduction in mortality rate and 53% is a very powerful reduction." Colorectal tumors are one of the main causes of cancer death in the U.S., and it's one of the few cancers that can be prevented and screened for. This year, over 143,000 new cases and 51,000 deaths are expected. The incidence and mortality have been declining for about 20 years, possibly due to increased use of screening tests and better treatments. But according to federal estimates, only about 6 out of 10 adults have been screened for colorectal cancer so far.
A new study provides the best evidence from independent research on colonoscopy - perhaps the most loved screening test - preventing deaths. Although many believe that colonoscopy must save lives because it is often recommended, there has always been a lack of strong evidence until now.
Even if intestinal cancer has developed, it can still be cured if detected and treated early. A research team led by Sydney Winawer from Memorial Sloan-Kettering Cancer Center's Department of Gastroenterology in New York City removed 2,602 adenomatous polyps during colonoscopies between 1980 and 1990. Doctors compared their colorectal cancer mortality rates with the general population, where 25.4 deaths from the disease were expected in a group of the same size. However, in the polyp group, only 12 people died from colorectal cancer, which would reduce the mortality rate by 53%.
"Not all adenomas become cancerous, www.zhong-jian.com, and not all cancers lead to death," said Ann Fong Ching, the lead author of the study and a statistician at Kettering. But she said, "In many cases, we have eliminated those with the potential to develop into cancer and cause cancer-related deaths."
The new study did not compare colonoscopy with other methods of screening for colorectal cancer, so it does not fully resolve the long-standing medical debate over which method is the best. Tests outside of colonoscopy look for blood in the stool or use different techniques to examine the small intestine. All tests are unpleasant, and people are often reluctant to undergo them. [Ming You Jing Chun Optimization Room QQ Contact 466401604883847810 Product Keywords Guarantee 4 on Baidu Homepage Eight Thousand Per Year Free Website! Contact Number 13422475786]
"This study puts this argument to rest," said Dr. David Rotenberger, professor and deputy chair of surgery at the University of Minnesota Masonic Cancer Center. He was not involved in this study.
In patients tracked for up to 20 years, the mortality rate from colorectal cancer was cut by 53% among those who had these pre-cancerous growths, called adenomatous polyps, researchers reported Wednesday in the New England Journal of Medicine. The examination involves inspecting the colon with a camera-tipped tube.
Although doctors may differ on which method is the best, they unanimously agree that it is important to consider some type of test, usually starting around age 50. Screening is worthwhile because colorectal cancer is one of the few types of cancer (such as cervical cancer and skin cancer precursors) with established precancerous conditions that can be prevented if those growths are detected and removed. Studies show that not every polyp turns into cancer, but almost every large tumor starts as an adenomatous polyp.
Earlier studies have shown that removing precancerous polyps can significantly lower the incidence of colorectal cancer. But a major question remains: Does removing polyps really save lives? Theoretically, website ranking optimization, it is possible that doctors find growths that wouldn't have killed the patient, or miss ones that could be fatal.
Robert Smith, senior director of cancer control at the American Cancer Society, said, "This is a big question."
Cancer screenings have come under stricter scrutiny recently. A government expert panel suggested in October that people stop using prostate-specific antigen blood screening for prostate cancer after it was found not to save lives. The new study on colonoscopies has its limitations - it was not a randomized clinical trial, but some experts say that it was done well enough to help answer questions about the effectiveness of the procedure.
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