Outlook: Genetic Testing’s Recessive Regulation
Young Industry Needs Rules and Limits for Examining Individuals’ DNA
Rick Weiss
Former Washington Post Science Writer; Senior Fellow, Center for American Progress
Monday, July 21, 2008
“The technology is undeniably impressive. For as little $1,000, anybody who can drool into a mailing tube can now find out his or her genetic odds of getting any of 20 or more potentially debilitating diseases, including cancer, heart disease and diabetes. … But tests that look into the fog of people’s medical futures are freighted with tricky medical, economic and bioethical implications. For one thing, most genes are not determinative, so these tests can convey only odds, not destinies. … Most worrisome of all, at least a few companies seem to be peddling DNA-based versions of snake oil. Some firms claim to be able to identify inherited nutritional deficiencies that — guess what? — are treatable with pricey supplements that they just happen to sell.”
____________________
Rick Weiss: Hello chatters. I know you are all anxious to know whether there is something in your genes that drives you to sit at a keyboard and virtually discuss with virtual others the virtual ability of gene tests to reveal something essential about you. Let me make one thing clear from the start: Please, do not send your spit samples to me. Or any other DNA-laden nail clippings or other body parts. I cannot answer your questions this way. But I am happy to use this more conventional means of communication, so let the questions begin.
_______________________
Southern Maryland: Genes vs. Jeans is my motto. I figure I can look at my family medical history to figure out my genetic history. With a diabetic parent, and several relatives on both sides of my family having diabetes, I know that without aggressive action/exercise and healthy diet I am staring at diabetes. Another relative had colon cancer, so my doctor ordered a colonscopy at age 40.
I figure if I exercise, eat right, get plenty of rest, reduce stress and fit into my skinny jeans, I will be able to fight the deadly genes and help the healthy genes. So it is a fight between the bad genes and the work necessary to stay in the skinny jeans! I doubt I would have the genetic testing, because I don’t think it would provide me with any new information.
Rick Weiss: Your point is (mostly) correct: The most important and telling single predictor of your future health is that of your parents and close relatives. Working with that, and general lifestyle decisions like the ones you describe, is a great start. That said, you should be aware of a major limit to your approach that is potentially dealt with by genetic tests: Many diseases arise spontaneously without family history. Only five percent of men who get prostate cancer, for example, can point to another family member who got the disease before age 55 (many men get it late in life, and it is often not pertinent at that point, so that does not count as bona fide family history). So in some cases, at least (and with all the potential downsides that my article noted) a test CAN tell you more than your family history.
_______________________
New Orleans: One thing I learned years ago is that DNA tests are accurate, but the people testing are not accurate. They found some testers were not doing the tests, or were spoiling these tests. Is there any evidence that the people doing the tests today are doing them properly?
Rick Weiss: This is a big issue in genetic testing. Most of the bigger companies doing this testing are using labs that are federally certified under “CLIA,” the relevant federal law on medical lab quality. So there reagents are fresh and the lab is clean… But how good are the testers? To know that, you’d have to have a system of proficiency testing. The federal government runs such programs for technicians doing other kinds of medical tests, but does not have a system set up for genetic testing, despite recommendations from a Health and Human Services advisory committee that it do so. Beyond the question of whether the strict answer is correct (do you have a certain gene variant or not) there is the additional issue of whether the risk that is being attributed to that gene variant is correct. There are a lot of ways to make this calculation. Different companies do it differently. There is a lot of room for error or disagreement here.
_______________________
Hyattsville, Md.: My mother-in-law suggested I do testing to see if I have the breast-cancer gene, as my risk seems to be high. My mother (63) and her mother both had breast cancer (but neither died from it), as well as one of my mother’s sisters (50 when she died) and three of my grandmother’s four sisters. In addition, some of my maternal great-uncles have had colon cancer — which I understand is linked to breast cancer in some genetic way. My preference would be to be preventative and act as though I do have the gene, but not have it confirmed (and potentially risk having that information used against me). What makes sense here?
Rick Weiss: This is hugely complicated issue that many women are struggling with today, and I will not pretend to be able to tell you what to do except for one thing: Go talk to a genetic counselor. These experts know all the right questions to ask to help you decide whether to go forward, including how you personally deal with anxiety and stress as well as what your medical and family history is. They understand the genetics and psychology of this emerging business far better than even most doctors do. They also recognize that as personal as this decision is, it is also a family decision, because what you learn can affect others related to you. All the major medical centers around here — Georgetown GW, Hopkins — have genetic counselors. Find one and start talking.
_______________________
Chicago: A quick glance at the 23 and Me Web site seemed to show that they don’t test as much for genes that clearly have established clinical relevance as for less well-known susceptibility factors. For example, for breast cancer they don’t test the BRCA1 or BRCA2 genes, and for male infertility they don’t test the AZF gene. Is it typical that these mail-order gene tests don’t test for genes that could indicate actual genetic disorders? What would be the rationale for this?
Rick Weiss: There are two issues here, one genetic, one business. Gene-wise, the truth is that the old idea that a certain gene or two will strongly predispose you to a disease (as in BRCA1 and 2 for breast cancer) turns out to be the exception, not the rule. In most cases, many genes together contribute in modest ways to risk, and in many cases these genes are not even fully characterized yet. Rather, scientists have found genetic markers that seem to “migrate” with disease — or give indirect evidence of risk. So that is what they test for. The business element is that many of the strongest predictors of disease, again such as BRCA1 and 2, are patented, and tests for them cannot be performed unless a deal is cut with the patent holders. That can change the price structure of direct-to-consumer testing considerably.
_______________________
Munich, Germany: You mentioned the existence of deceptive gene-test companies; in the event that DNA could be used in the future as personal identification, has there been much though within this industry regarding the protection of personal DNA information? In the worst case, once a criminal organization has a person’s DNA code, that person can’t swap out their DNA like a new credit card number.
Rick Weiss: All the big gene test companies boast that they have great security and privacy systems in place. For obvious reasons, they also don’t reveal details. So we are all left to wonder just how good these systems really are. That said, if a criminal wanted to capture your DNA and use it for fraudulent purposes, he or she would not have to crack the high-security Web site at 23andMe. All they need to do is pick up the cigarette butt you dropped on the ground, or the cup you drank from, or the hair in your shower. We all leave our genetic ID cards everywhere we go. I hope this has allayed your fears ….
_______________________
New Orleans: How difficult is it to be a DNA tester and analyst? While DNA tests are good, isn’t there also a risk if there is someone who doesn’t know how to handle the specimens properly or interpret the data correctly? How much of a problem is that?
Rick Weiss: As I mentioned in a previous post on this chat, there are outstanding issues of proficiency testing. I will add here that one problem in particular is that most DNA tests start with a very little bit of DNA and amplify it millions of times to get enough to do all the testing on. That means that the system is very susceptible to contamination. If even a smidgeon of the tester’s DNA got into the system while he or she was doing the work, for example, it could be amplified and pretty soon some poor client is getting a report in the mail that describes the lab technician’s medical risks… There are controls in place of course to limit this kind of error, but it does happen (and has happened in crime labs, alas, as well)so lab and technician quality is crucial in this business.
_______________________
Arlington, Va.: Rick: You have called for more regulation of these tests, but I also know that sometimes the FDA and other agencies can take years in approving new products. What are your thoughts about the balance between regulation vs. not slowing down innovation?
Rick Weiss: FDA does act very slowly, and there is a legitimate concern that over-regulation (or slow action) by FDA will stall this potentially important new enterprise. Moreover, as Kathy Hudson recently noted (she of the Genetics and Public Policy Institute in DC, which has worked on this issue a lot and has a good Web site for those interested): If you even MENTION the prospect of the FDA getting involved in this area it gives these gene test CEOs a serious case of hives. That is why I am open to the idea of a compromise approach, in which the Department of Health and Human Services (and perhaps ideally a part of HHS that is not FDA)comes up with some formal guidance that sets the standards bar for certain aspects of gene testing. It could be flexible enough to change more quickly than regs can as the science changes. But it would make plain to companies what is expected of them. Many companies say they can set these standards themselves. I think recent events in the financial industry, which for years has been left largely to regulate itself and has now been found to have taken terrible advantage of the public while feeding itself greedily, should be a lesson to us that when potentially large profits are at stake — as is always the case, it seems, in healthcare — some kind of independent oversight is really needed.
_______________________
washingtonpost.com: What sorts of regulatory oversight do you think would be appropriate for this industry? Is there anything that could be done about the fraudulent outfits, or are they as impervious to U.S. laws as online “pharmacies”?
Rick Weiss: See my previous post on this discussion about the potential for oversight by FDA and other agencies within HHS. But there is another federal agency that needs to get more active as well: The Federal Trade Commission, whose job is to identify and punish consumer fraud. Most of the gene test companies I’ve dealt with seem essentially legit, and even extremely dedicated to scientific accuracy (although I do have questions about the real value of this kind of information for most people). But there are at least a few that seem transparently fraudulent or at least, how can I put it?, worthy of some scientific and legal scrutiny. Consumers should be especially wary of any Web site that purports to diagnose you or predict a future health problem for you AND just happens to sell a product that it claims is just what you need. And while love and sex are complicated affairs that no doubt have some kind of genetic components, I can’t help but be skeptical about any company that claims it can help me choose, on the basis of my DNA, a mate who will have more orgasms and give me healthier children (as one company does). I hear that the FTC is currently investigating at least two gene test companies. I will be interesting in seeing what agency officials do, and how quickly they act.
_______________________
Washington: Knowing what you do about genetic testing and how much we are now learning about the makeup of our DNA, would you suggest cord-blood banking in terms of its future potential at saving our children from serious diseases, or would you suggest only doing it if you have a family history of a specific disease that may be treatable in the near future?
Rick Weiss: I have my doubts about the value of cord blood saving for most people. Experts have told me they have their doubts too. While there may be some exceptional circumstances when it may prove valuable to have some cord blood handy to, for example, treat your baby later in life, the odds are low and some doubt you’d be able to track down and get those crucial cells in time — to use for transfusion purposes, for example, after an accident. That said, cord blood cells do seem to be an extremely valuable resource for research and increasingly for clinical purposes (as a source of cells to rejuvenate the blood system for cancer patients who have had chemo and radiation for example). I think people should consider donating their cord blood to non-commerical cord blood banks, for use and sharing by those who prove to be a good match and could benefit from these deposits, much the way people donate blood through the Red Cross today
_______________________
Providence, R.I.: One benefit of genetic testing is an opportunity for preventative care — for diabetes or certain types of cancer, for instance. While there always will be a grey area (of varying degrees) between a DNA test and future health, patients will gain some security in being able to “manage” the potential of even rare outcomes.
Rick Weiss: It is true that a DNA warning shot over your bow may get you to take preventive action that you might otherwise not have considered or not been sufficiently inspired to pull off on your own. But everybody already knows what they SHOULD be doing. So arguably, the test is not crucial to forming good health behaviors. And of course the test can and will scare some people unnecessarily, since these tests are not terribly good at telling individuals whether they personally are really in line to get a disease or not — rather, it is all odds driven, and people are notoriously bad at understanding and interpreting odds. In the end, it is obviously a personal decision. Some people will be inspired and empowered by their DNA results. Perhaps their lives will be saved by a DNA test. Others will wish they had never done it. The real difficult issue here is how to allow the former to benefit from this newly available technology without making a big slice of the population unduly vulnerable to the downside. And of course, how to do this without being overly paternalistic. People want to have choice, but they also don’t want to be taken for a ride. People hate “government,” it seems, but they REALLY hate it when their government does not protect them….
_______________________
Baltimore:“I can’t help but be skeptical about any company that claims it can help me choose, on the basis of my DNA, a mate who will…” This is a fascinating application of the power of suggestion and perhaps the placebo effect — hopefully all of their tests turn out positive!
Rick Weiss: In fact, the company I am thinking of uses an interesting scientific finding to come to its matchmaking conclusions: evidence that in some mammals, at least, males and females with the most divergent immune system genes seem to be attracted to each other and perhaps have healthier offspring. That’s great if you are a mouse sniffing your date’s urine (which is how those mammals do this kind of assessment) but I have my doubts that this deserves such high ranking in humans, among all the things that go into a happy marriage and having healthy kids. But hey, that’s capitalism for you. Run it up the flagpole and see if it sells.
_______________________
Arlington, Va.: I heard Dr. Francis Collins do a talk about genomics. He mentioned that genetic tests can be useful in identifying whether or not a particular dosage of a drug is right for specific patients, and mentioned coumodin for heart conditions. My mother struggled a long time as her doctors tried to find the right dose for her, to avoid strokes or bleeding. Do you see this an important new area for these tests?
Rick Weiss: This is indeed a wonderful and non controversial application of genetic testing. Some people have gene variants that break down certain drugs quickly, so need a higher dose of those medicines. Others are in the opposite situation, and can overdose with a normal dose. Recently, the FDA has even been tailoring some drug approvals with language noting that some patients should get a genetic test before taking the drug, to make sure it will work for them and not be toxic. DNA has huge potential in so many areas of medicine — and other areas, of course, including criminal justice and evolutionary and anthropological studies. It’s all about how we use it and interpret those results … and who is minding the store as these tests and products get sold directly to consumers.
_______________________
“But everybody already knows what they should be doing.”: As an adopted person I have no idea of my family medical history, so I might welcome certain tests. I thought I’d add that it was good to see the Congress pass the genetic nondiscrimination law a few months ago.
Rick Weiss: Whether you are adopted or not, you should eat fresh foods in moderation, exercise, and not smoke. That’s what I meant. But yes, you are right, adoptees can fill in some of the holes in their medical history with DNA tests. Again, the problem is that most of these test are still not very definitive.
_______________________
Rick Weiss: Thanks everybody for an interesting hour.
Rick