What to Know About Colonoscopies
Screenings for colorectal cancerhave dramatically prevented the incidence of the disease in the last 45 years.
“Colorectal is one of the most treatable and curable cancers when found at an early stage,” says Daniel H. Hunt, MD, FACS. “Every individual who is at screening age should have these tests available to them.It’s effective and it’s safe.”
Dr. Hunt—assistantprofessor ofsurgery atWeill Cornell Medical College, Cornell University, andassistant attending surgeon atNewYork-Presbyterian Hospital—adds that the survival rates for Stage 1 colorectal cancer is about 90 percent. The survival rate for Stage 4 is less than 15 percent.
“We’re very good at treating colon and rectal cancers when it’s identified in a timely fashion.”
Here Dr. Hunt offers insightonthe importance of regular colonoscopies, possible early signs of the disease, andwhat risk factors play a role in colonoscopies.
Colonoscopies are key.
The most effective screening testfor colorectal cancer is acolonoscopy,a procedure in which a gastroenterologist uses a long, flexible tube (a colonoscope) to view the entire colonwhile a patient is under general anesthesia.Doctorslocate and removeprecancerous growths calledduring the procedure.
“The preparation for a colonoscopyis important because we need the colon to be free and clear of debris so we can get a good look at the lining,” Dr. Hunt explains. “To do this, the patient has to drink a certain amount of fluids, starting the day before the procedure. That process is easier for patients than it used to be because they can drink a much smaller volume.”
Dr. Hunt notes that, although there areadditionalteststo evaluate thecolon—including at-home stool and abnormal DNA tests—t’re a starting point to evaluate colon health, not a replacement for colonoscopy.
Genetics can play a role in screeningrecommendations.
The Centers for Disease Control and Prevention (CDC)that most people begin screening for colorectal cancer soonafter turning 50, then continue getting screened at regular intervals.Dr. Hunt pointstoan area of research evaluating the“concerning trend”ofyounger patientsbeing diagnosedwith the disease, leading gastroenterologists to recommend colonoscopiesearlier.
“There’s research into whether there’s a genetic component to this—that maybe there are mutations that put some patients at higher risk, along with lifestyle factors,” he says.
The CDC also states that patients mayneed to be testedbefore age50,and/or morefrequently, ifthe patient hasa closerelativewithcolorectal polyps or colorectal cancer; such as Crohn’s disease or ulcerative colitis; and/or agenetic syndrome such as or
“We also know that in African American communities, there can be a tendency to develop colorectal cancer at an earlier age, compared with other groups,” Dr. Huntsays. “This can be genetic or environmental,butthe other concerning part is that when these patients are diagnosed,they have poorer outcomesthat aresometimes linked to a lack of access to care--the medical community is awaiting more data on this.”
The CDC adds thatAfrican, African American and Black patientswith an average risk for cancerreceive a colonoscopy every 10 years beginning at age 45;and that Asian, American Indian, Alaskan Native, Hispanic, Native Hawaiian, Pacific Islander and White patients receive a colonoscopy every 10 years beginning at age 50.
The role of lifestyle.
There are—mainly,diet and physical activity—thatcancontribute to an increased risk of colorectal cancer, Dr. Hunt says.
He stresses the importance ofparticipating inܱ physical activity;creating adiethighin fruit,vegetablesand fiber, while low in fat; avoiding processed meats and tobacco; and limiting alcohol intake.
Family history matters.
“We also take time to stress the importance of knowing the family history and asking questions, because it can really change whether a patient should wait for a screening or have it performed even earlier,”Dr. Hunt says.
Thereare genetic mutations that can be associated with both colorectal cancer and other types of cancers, including uterine and bladder cancer, that can put several families at risk.
“Sometimes we also recommend another screening based on a discussion about other cancers in the family,” he adds.
Early awareness leads to better outcomes.
“Sometimes people push aside symptoms and never get evaluated,” Dr. Hunt says.“But you don’t really know until you check,”
Rectal bleeding, for example, is due to hemorrhoids in the “vast majority” of patients.
Other possible colorectal cancercan include a change in bowel habits; diarrhea, constipation, or feeling that the bowel isn’t fully empty; abdominal pain, aches, or cramps that don’t go away; and seemingly unexplained weight loss.