Q: What are the medical-legal issues for a physician who is trying to follow guideline-based care when there are different guidelines?
A: Any physician can say, “We follow the guidelines of this particular organization.” I don’t think anyone can say that an organization’s guidelines are malpractice. For individual physicians, following a set of office-based guidelines will hopefully keep them out of legal difficulty.
Q: What are the risks of overscreening, especially in breast cancer where false positives may result in invasive testing?
A: What people think of as overscreening takes a number of different forms. What one guideline would imply is overscreening is recommended screening by another guideline. I think we would all agree that in an average-risk population, beginning screening before it is recommended would be overscreening, and continuing screening when a patient has life-limiting comorbidities would constitute overscreening. Screening too frequently can constitute overscreening.
For example, many women report that their doctors still are advising a baseline mammogram at age 35. Most guideline-developing organizations would regard this as overscreening in an average-risk population.
I think we are also getting better, certainly in prostate cancer, about knowing who needs to be treated and not treated. There are a lot of cancers that would have been treated 20-30 years ago but now are being safely followed with PSA and MRI. We may be able to get to that point with breast cancer over time, too.
Q: Are you saying that there may be breast cancers for which active surveillance is appropriate? Is that already the case?
A: We’re not there yet. I think some of the DCIS breast cancers are part of the discussion on whether hormonal treatment or surgeries are done. I think people do have those discussions in the context of morbidity and life expectancy. Over time, we’re likely to have more cancers for which we won’t need surgical treatments.
Q: Why did the American Cancer Society change the upper limit for lung cancer screening from 75 to 80 years of age?
A: For an individual older than 65, screening will now continue until the patient is 80, assuming the patient is in good health. According to the previous guideline, if a patient was 65 and more than 15 years beyond smoking cessation, then screening would end. This is exactly the time when we see lung cancers increase in the population and so a curable lung cancer would not previously have been detected by a screening CT scan. *
Q: What role do the multicancer blood and DNA tests play in screening now?
A: As you know, the Exact Sciences Cologuard test is already included in major guidelines for colorectal cancer screening and covered by insurance. Our philosophy on multicancer early detection tests is that we’re supportive of Medicare reimbursement when two things occur: 1. When we know there’s clinical benefit, and 2. When the test has been approved by the FDA.
The multicancer early detection tests in development and undergoing prospective research would not now replace screening for the cancers with established screening programs, but if they are shown to have clinical utility for the cancers in their panel, we would be able to reduce deaths from cancers that mostly are diagnosed at late stages and have poor prognoses.
There’s going to be a need for expertise in primary care practices to help interpret the tests. These are new questions, which are well beyond what even the typical oncologist is trained in, much less primary care physicians. We and other organizations are working on providing those answers.