Economy
Harvard nuclear cancer study collapses under its own methodology
By Bear Creek Staff, . Bear Creek Capital Network.
Four papers published between December 2025 and mid-2026 by a team led by Yazan Alwadi at Harvard's T.H. Chan School of Public Health claimed to find elevated cancer incidence, cancer mortality, and total mortality among people living near nuclear power plants. The studies appeared in Environmental Health, Nature Communications, the Journal of Exposure Science and Environmental Epidemiology, and the European journal Environmental Epidemiology, according to Marginal Revolution.
The problem is that critics Deric Tilson and Adam Stein applied the same methodology to other locations and found results that make the nuclear findings impossible to take seriously. Living near a private four-year university, Tilson and Stein found, is associated with a 15-fold increase in cancer mortality compared to living near a nuclear power plant. Costco produced the largest effect of any location they tested. As Marginal Revolution quoted them directly: "Over 2.2 million cancer deaths can be attributed to Costco; that's more than 20% of all cancer deaths between 2000 and 2018."
The critique is methodological, not political. Tilson and Stein's argument is that the Alwadi team selected nuclear power plants as their landmark because a plausible narrative existed around that choice, then stopped there. They never ran the same test against other landmarks to check whether the method itself was generating the signal. The critics put it this way: "by taking the easy way out, getting results and making up a story around those results without double-checking their method, the authors could have no idea that what they were actually capturing was the methodology itself."
Tilson and Stein's conclusion is blunt: "The attributable number of deaths from this methodology is probably zero, but the attributable number of bad papers is at least four."
For investors and analysts tracking the nuclear energy sector, the practical implication is worth separating from the methodological one. The Alwadi papers generated real press coverage and, in a policy environment where nuclear power is being reconsidered as a low-carbon baseload source, studies linking plant proximity to cancer carry weight with regulators and local governments. The Tilson-Stein replication does not prove the plants are safe; it proves the studies do not establish that they are dangerous. That is a narrower claim, but it is the correct one, and the distinction matters for anyone pricing regulatory or reputational risk in the sector.
What remains unknown is whether the journals involved will issue corrections, whether the Alwadi team will respond to the replication, and whether the original coverage of the four papers will receive the same attention as the critique. Peer review did not catch this before publication across four separate journals, which is the harder question the episode leaves open.
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