Should UK primary care be an early adopter of genomic medicine?

UK PRIMARY CARE SHOULD BE AN EARLY ADOPTER OF GENOMIC MEDICINE

Genomic medicine is already with us in the NHS. The 100 000 Genome Project (https://www.genomicsengland.co.uk/) has generated regional genomic medical centres, which will help in determining the clinical utility of gene variants. We already have genomic databases that aim to link genotype with phenotype.

Anyone in the UK, including patients and their families, can pay for an over-the-counter genetic test that provides information on long-term conditions, such as asthma or hypertension, as well as information about personal traits. There is a duty to respond to their needs for knowledge, and consider targeted treatments and avoidance of potentially harmful treatments that are unlikely to work. We have to understand the opportunities and limitations presented by patients turning up with genomic information to discuss, and GPs will identify learning needs as a result of exposure to genomic conversations with patients.

By definition, the genomic patient has acquired a disorder through no fault of their own but by reason of being born. Thus the early use of genomic medicine tackles the inequality of opportunity that is ‘bred in the bone’. Wider determinants of health notwithstanding, we must not ignore the potential for individual and societal benefits of new medical approaches. Monogenic conditions, such as Huntington’s disease, can be life-threatening, as can polygenic conditions, such as ischaemic heart disease. It is in the polygenic field — the realm of genomics — that great promise for patient benefit lies.

There is an intuitive argument that (when they are available) all available technologies that could be deployed to patient benefit ought to be (ethics should not be synonymous with hindrance), and that not being an early adopter means not being in control of the emerging technology and perhaps even paying more for it as a result.

UK PRIMARY CARE SHOULD NOT BE AN EARLY ADOPTER OF GENOMIC MEDICINE

However, the evidence base for genomic medicine is incomplete, the technology still promissory, and the underpinning ethical assumptions insufficiently scrutinised.³ This does not argue for or against genomic medicine per se, but raises concerns about its premature adoption.

Genomic medicine is a term used to describe a new paradigm for health care, building on the Human Genome Project, by using molecular profiling to identify multifactorial health risks and to develop pharmacogenomic drugs, rather than the supposedly dominant ‘one size fits all’ model in prescribing. Emphasis on individuality is evident in the widespread use of the term ‘personalised’ medicine. More recently the terms ‘stratified’ and ‘precision’ medicine have come into favour,^4,5 but lack the powerful appeal of personalised medicine, with its promises of greater patient empowerment.⁶

If the science behind personalised or genomic medicine is as far advanced as its proponents claim, that would not satisfy ethical qualms about whether it is right or feasible to make clinical decisions on the basis of a patient’s genetic profile.^7,8 The decision to offer or withdraw treatment based on the probability (not certainty) that it will work has little to do with respect for autonomy. It is frequently argued that genomic personalised medicine will be both more efficient and more cost-effective, because resources will not be wasted on patients whose genotype makes them unlikely to respond to a targeted drug. But this ignores the serious ethical question of whether or not it is fair to deny treatment to those patients if they request or require it (some chance of benefit being better than none). Evidence of a likely benefit is already a rationing tool — why would a genetic profile not be used in this way?

There is a concern that genomic data will lead to genetic discrimination. In the UK at least, GPs have a role as stewards of patient data. For example, GPs are often asked for medical reports to help decide insurance premiums. The UK insurance industry has a self-imposed moratorium, recently extended until 2019, that states they will not ask policy holders to have a genetic test, or for the results of a genetic test, for policies valued at less than £500k for life-insurance purposes (and less than £300k for other purposes). Above these limits, only tests specially approved can be used. However, family history of disease continues to be used to load or refuse premiums.⁹ We wonder whether such a moratorium would be maintained were genomic information to be as much a part of everyday general practice as a ‘family history’. Function creep, where technology purchased for a good purpose is used for less laudable aims, is also a concern. We have seen this in the use of confidential patient data to detect failed asylum seekers and there is already discussion that the genome might be used for forensic purposes.¹⁰

Target populations for pharmacogenomic drugs will necessarily be smaller than the population as a whole.^11,12 However, drugs that target a narrower segment of the patient population are often more expensive: one such drug for cystic fibrosis in the US, for example, costs $300 000 a year.³ Indeed, primary health care already has more tools, and indeed problematic issues, than it knows what to do with. Caution is needed when commissioning promising but costly technologies before their benefit is proven, especially if this would mean having to decommission something else.