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Whether research funding and charitable donations correlate with the major causes of cancer death is increasingly discussed and criticized in the popular press.1–4 For example, one news article notes that breast cancer receives more research funding than lung cancer, although the latter is responsible for more deaths.1 A slight modification to this argument is found in academic journals, in which authors lament the fact that funding for different tumor types or different diseases is not proportionate to years of life lost or disability-adjusted life years lost.5,6 Although these criticisms are initially compelling, on closer reflection they are flawed. Although it is plausible that disease funding and donations should be proportionate to some measure of the harm or damage done by a particular disease or specific tumor type, it is not certain that this will in turn result in the greatest benefit. Making this assumption is a straightforward logical error. Research funding ought to maximize the potential absolute risk reduction from research gains, and need not be strictly proportionate to measures of the severity of disease. Consider a general and incontrovertible principle of ethical funding, which many tacitly embrace but which is rarely stated outright: the optimal funding portfolio will decrease the burden of disease as greatly as possible. This is the unspoken principle that underlies much of the discussion of funding. Put another way: the most logical and ethical way to fund cancer research by tumor type would be to do so in a way that returns the most life years to our patients. This is what philosophers call the utilitarian answer. All things being equal, we should fund projects that will give us the most years of quality life back. Now consider the first approximation to this question, embodied by articles that contrast causes of death with amounts of donation or funding. These are all based in the premise that funding should be proportionate to what robs us of life. But, although it may be reasonable to think that such a funding system may do the most good, we must acknowledge that it is mistaken, for the simple reason that causes of death vary by age. For this reason, more infrequent causes of death may actually result in larger numbers of life years lost. For example, if cancer strikes down more people in the prime of life, while heart disease is responsible for more deaths in later years, cancer may be a more important public health problem. It turns out that this is the case. Years of life lost—a measure that takes into account the untimeliness of death—is bigger for cancer than for heart disease.7 Perhaps this explains why, intuitively, the public may donate more to cancer than heart disease.2 And yet, even years of life lost (adjusted or not adjusted for disability) remains an imperfect proxy for what we are trying to maximize. Remember, the utilitarian answer is to do the most good per dollar spent, and, although it is plausible to think this happens when we tackle the ailments that rob of us of the most life years, this is an imperfect proxy. For example, if we are on the cusp of a major breakthrough for a rare disease (eg, chronic myelomonocytic leukemia), while still at the drawing board for a disease that is common (eg, pancreatic or lung cancer), investing in the former may make sense. For each dollar spent, we may in fact save more life years. Thus, we reach the conclusion that funding should be proportionate to efforts that are likely to bear fruit. Vinay Prasad, MD, MPH

How Should Research Be Funded? Difficulties With the Argument for Proportionality to Causes of Death or Years of Life Lost