Colorectal cancer screening remains essential for elderly Americans

Oct 15, 2007

As people get older, their risk of developing polyps and colorectal cancer increases. Currently, there is no clear evidence or established guideline for the upper age limit for colorectal cancer screening by colonoscopy. Two new studies presented at the American College of Gastroenterology’s 72nd Annual Scientific Meeting suggest continued colorectal cancer screening among healthy elderly Americans.

Dr. Matthew M. Baichi and his colleagues from the University of Buffalo and the VA Western New York analyzed the results of 587 colonoscopies performed at their institution in 2004. Fifty-six patients were age 80 or older and 531 patients were younger than 80. Researchers collected data on the number and location of adenomas, histology, presence of advanced adenomas, and colon cancer.

In this Buffalo study, colorectal adenomas were detected more frequently in older patients. Adenomas were found in 35.7 percent of patients age 80 or older and 20.4 percent of patients younger than 80. There was a trend for more proximal advanced adenomas in patients over 80 (12.5 percent) compared to those younger than 80 (6 percent). After a 2.5-year follow-up, 72 percent of patients over the age of 80 were alive compared to 82 percent of patients between the ages of 70 and 79.

“While screening colonoscopy is controversial in patients over 80, age alone should not be a contraindication to colorectal cancer screening,” says Dr. Baichi. “The results of this study suggest screening colonoscopy should be considered in healthy elderly patients.”

Screening Leads to Earlier Stage of CRC Diagnosis in Elderly Patients and Improves Survival

In separate research conducted at Scripps Clinic in La Jolla, CA, Emily G. Singh, MD, Catherine T. Frenette, MD, and Williamson B. Strum, MD, found that screening colonoscopy improves survival in elderly patients. The critical question for these researchers was whether screening colonoscopy leads to earlier stage of colorectal cancer diagnosis in the elderly, and thus improves survival in older patients.

The Scripps analysis included 243 symptomatic and 113 asymptomatic patients diagnosed with colorectal cancer between January 2000 and December 2005. Patient records were obtained from the Scripps Green Hospital Cancer Registry. Patients were divided into two groups based on symptoms and by age and stage of disease at diagnosis. The stages of colon cancer were separated at a critical point: early stage (Stage 0 – IIB) and late stage (Stage III – IV). Researchers found 101 patients had stage I colon cancer, 105 patients were diagnosed with Stage II colon cancer, 72 with Stage III, and 61 patients had stage IV colon cancer. The survival rates of all patients were evaluated from the time of initial colon cancer diagnosis.

After a two and a half year follow-up, researchers found asymptomatic patients had significantly improved survival compared to symptomatic patients. There was a sustained difference in stage of disease favoring patients who were asymptomatic, for all ages between 50 and 84, suggesting a role for preventive screening even among those of advancing age. According to Dr. Emily Singh, “We conclude that there is a role for screening colonoscopy in asymptomatic individuals without significant comorbidities up to age 84.” Neither the American College of Gastroenterology nor any other guideline groups currently set an upper age limit for colorectal cancer screening by colonoscopy.

Source: American College of Gastroenterology

Explore further: New cancer vaccine approach directly targets dendritic cells

add to favorites email to friend print save as pdf

Related Stories

Gold nanorods attach to, kill bladder cancer cells

Apr 08, 2014

(Phys.org) —A major strategy of modern cancer research is to discover a difference between cancerous and healthy cells and then to specifically target this difference to kill cancer cells without harming ...

Amino acid fingerprints revealed in new study

Apr 06, 2014

Some three billion base pairs make up the human genome—the floor plan of life. In 2003, the Human Genome Project announced the successful decryption of this code, a tour de force that continues to supply ...

New high-tech glasses detect cancer cells during surgery

Mar 10, 2014

A team of scientists at Washington University School of Medicine in St. Louis (WUSTL) and the University of Arizona (UA) in Tucson led by Samuel Achilefu have created a pair of high-tech glasses that help ...

A microchip for metastasis

Feb 06, 2014

Nearly 70 percent of patients with advanced breast cancer experience skeletal metastasis, in which cancer cells migrate from a primary tumor into bone—a painful development that can cause fractures and ...

Recommended for you

Physicians target the genes of lung, colon cancers

4 hours ago

(Medical Xpress)—University of Florida physicians and researchers are collaborating to map the genes of different types of cancer, and then deliver medication to attack cancer at its source.

User comments : 0

More news stories

HIV+ women respond well to HPV vaccine

HIV-positive women respond well to a vaccine against the human papillomavirus (HPV), even when their immune system is struggling, according to newly published results of an international clinical trial. The study's findings ...

Progress in the fight against quantum dissipation

(Phys.org) —Scientists at Yale have confirmed a 50-year-old, previously untested theoretical prediction in physics and improved the energy storage time of a quantum switch by several orders of magnitude. ...

Revealing camouflaged bacteria

A research team at the Biozentrum of the University of Basel has discovered an protein family that plays a central role in the fight against the bacterial pathogen Salmonella within the cells. The so cal ...