About a month ago, I posted a note discussing the Respiragene IVDMIA, which is a lab test comprised of a set of biomarkers and used to determine the predisposition of the patient to develop lung cancer (see: Respiragene as a "Not So Useful" Lung Cancer Risk Test Comes to Market). Kevin Murphy, CEO of Synergenz, the company that developed the test, responded with this comment on November 12, 2009 :
I saw your comments about the Respiragene test and hope you'll allow me to make a few clarifying points in response. By way of disclosure, my company Synergenz Bioscience Ltd has helped fund much of the 8 years of studies that underpin the core technology, including trials involving thousands of individuals. The urgent medical need for the Respiragene test is to help doctors and patients establish which individuals -- among all smokers -- are most likely to get lung cancer from their habit and to do something clinically useful with that information. We agree, no one needs a test to confirm that smoking increases the overall risk of lung cancer. However, there is great benefit in helping identify the people for whom smoking is especially dangerous -- as genetic predisposition and habit collide -- and while there is still time to help them lower their risk of lung cancer, and other smoking-related diseases.
Many smokers rationalize their ongoing risky behavior by believing that the risk of dying of lung cancer is someone else's risk -- not theirs. That's known as "optimistic bias"....Helping someone break their smoking habit is among the most cost-effective medical interventions available, let alone improving their health and well-being....Equally, knowing who is at greatest future risk of lung cancer may help prioritize individuals for closer monitoring ....Yes, these survival rates are terrible, and haven't improved much in decades. This is largely because when obvious lung cancer symptoms emerge, the cancer is often found in a more advanced and less treatable stage. We strongly believe Respiragene can also help act as a "funnel" for identifying patients most likely to benefit from screening with CT scans, or other relatively expensive early detection approaches as they hopefully emerge.... Your idea that some individuals will ask their doctor for this test to avoid a higher lung cancer risk result and convince themselves it's still safe for them to smoke is a stretch.
Dr. Karl Robstad who blogs over at the 1X Objective responded on December 1, 2009, to Kevin's comment with his own, which is copied below:
My *gut* instinct, here, is to side with the New York Times and Dr. Friedman in this case, and, it’s not because I have an innate distrust in for-profit labs....I think, for me, the devil really lies in the details. So, I have taken Kevin’s advice and have read just about everything I could find on the product....Having read all of that...it seems as if the hard data just isn’t conclusive enough to really make a case; it may be promising, but I’m just not convinced that it’s there yet. For example: one of the studies involving GSTM-1...reported *lower* confidence that quitting could reduce lung cancer risk ...than those receiving GSTM1-present results. There were no other significant between-group differences.” Another ...concluded: “Although the program [Biofeedback with GSTM-1, again] increased short-term cessation rates compared with standard intervention, genetic feedback of susceptibility may not benefit smokers with high baseline risk perceptions.”
Now, granted, Respiragene is composed of much more than just GSTM-1, but, according to your website’s references, all of the articles referenced were about this GSTM-1....I suppose, for me, if meta-analysis of the genetic markers *without* the non-genetic risk factors mixed in showed significant correlation with Lung CA propensity, then I would totally be behind your product!....Finally, perhaps the most helpful data would come from comparison trials, putting Respiragene up against traditional cessation methods, like the nicotine lozenge. I know many modalities are usually used at once in the real world, but if you could show benefit compared to traditional modalities, then you might be on to something big!
In summary, it seems to me that there are three critical issues to be understood here. The first is whether the Respiragene test is able to accurately predict those individuals who both smoke and have a greater risk of developing lung cancer. Secondly. we need to know whether these patients, having acquired knowledge about their predisposition to cancer, are successful in their smoking cessation efforts. Thirdly, we need to know whether their smoking cessation has altered in some way the progression of the disease for them.








