Q&A: Wider Knowledge About Cancer Prevention Would Reduce U.S. Deaths
There has been a lot of progress in the fight against cancer. Cancer death rates have dropped, but the gains haven't been experienced equally.
Cancer death rates remain high for some minorities, including African-Americans. There are geographic differences, too. Death rates for breast and colorectal cancers have declined faster in New England than in other parts of the country. Cancer is also more likely to be fatal for people living in poverty or those without a college degree.
Dr. Otis Brawley, chief medical and scientific officer of the American Cancer Society, says many cancer deaths could be averted if these demographic gaps were narrowed. He discussed the future of cancer prevention, screening and treatment, as the American Cancer Society lays out its vision for cancer control in a series of articles that are being published in CA: A Cancer Journal for Cliniciansstarting Tuesday.
These interview highlights have been edited for length and clarity.
Can you put the current cancer situation into perspective? Where have we been, and how far have we come?
The age-adjusted death rate for cancer in the United States was about 60 deaths for every 100,000 Americans in 1900. It peaked at 215 deaths per 100,000 Americans in 1991. And now it has gone down 26 percent. It's now about 159 deaths per 100,000. So we have had significant declines in the cancer death rate since 1991.
Cancer statistics vary across different groups. Which demographic group is hardest hit?
The biggest driver really is education. College-educated Americans have a much lower risk of cancer death than non-college-educated Americans. If all Americans had the risk of death of college-educated Americans, 150,000 cancer deaths – that's a quarter of all cancer deaths – would not occur this year.
Does that mean that the best strategy for beating cancer is sending more people to college?
I don't know if sending more people to college is exactly the right answer. I think that a good question is, how do we get what we already know about cancer prevention, screening and treatment to as many people as possible? I really think that our health care systems need to adjust a little to try to get knowledge about cancer prevention to everybody. It's a real shame that we're not doing better.
Are you saying it's more of a knowledge issue than an access issue?
We can talk about the access to care issue. Can they afford to see the doctor? That is an issue that does need to be dealt with.
But a big part of the disparities we're seeing are people who don't understand how to utilize their health care. There is literature showing that even people with pretty good insurance don't go get help.We have definite studies showing that people who don't understand health are more likely to tolerate abdominal pain, sometimes for years. Whereas people who are more educated will say, "I have a problem."
For decades, smoking has been at the top of the list of social habits public health officials would like to eliminate. What's No. 2?
The No. 2 cause of cancer is a combination of too many calories, not enough exercise and obesity. Think of it as a three-legged stool. It actually kills more people from diabetes and heart disease than from cancer, but it is currently the second-leading cause of cancer in United States.
Many of us are predicting in the next 20 years, because smoking rates are going down, that this will become the No. 1 cause of cancer.
Often, a person's daily habits have health consequences much later in life. Are there any current social trends that you think could result in higher cancer rates 30 or 40 years down the road?
We've gone from 15 percent of adults being obese in 1970 to 35 to 40 percent of adults in 2015. So I think that's something we need to look at very carefully.
I worry about binge-drinking. Binge-drinking may actually be picking up on college campuses.
Now the question a lot of people ask me about is e-cigarettes. We don't know if those things cause cancer. But we don't think of them as being healthy, I can tell you that.
The paper notes that childhood cancer rates have increased, but death rates have declined. Why?
I am not sure why incidence has gone up. I am sure why mortality has gone down. And that is because childhood cancers usually are caused by only one mutation or one genetic abnormality. That means that the cancers kids have are much more sensitive to chemotherapy drugs and much more sensitive to radiation than the cancers adults get. So the reason why mortality has gone down is because children's cancers are easier to treat.
Why do certain cancers, like breast cancer, tend to receive more public attention than others?
We don't see as many lung or pancreatic cancer advocates as we see for breast or prostate cancer because fewer people survive those diseases. Lung and pancreatic cancer are much more deadly.
Does this attention disparity have any negative consequences?
Yes, but not for the reasons you might think.
I'm constantly trying to get folks not to focus on one particular disease. I see people advocating to Congress to put more money into breast cancer research or prostate cancer research at the federal level. I'm constantly trying to put down those voices and get scientists to think outside of the silos of disease.
Why is it important for scientists to do that?
One of the most effective drugs that we have right now for any cancer is crizotinib (brand name Xalkori). Crizotinib was discovered by people who were doing thyroid cancer research. They thought outside the box and said, "What if we give this drug to people who have lung cancer?" Literally, we have a lung cancer drug that wouldn't have existed without thyroid cancer research.
Who are you hoping will read this series of articles?
These papers are really aimed at a broad audience. They're aimed at people who might be teachers or politicians. They're aimed at people who might be able to influence society, as well as doctors and health advocates, so that everyone can understand what the true facts are. There's some confusion, especially about cancer screenings and other things. So we want to try to get it right in these papers so that everybody can understand what the science is.
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