“This case study is a masterclass in scientific reasoning," said Brugel. "They identify a cluster, associate it with overexposure to pesticides, obtain transcriptomic and epigenetic data, compare them, notice they are different, generate a hypothesis and open up a new avenue." Not only did this study identify several hundred areas nationwide that had an increased risk of cancer due to environmental pesticide exposure, but it also offered an explanation for the mechanisms by which these substances can combine to subtly promote the development of cancers in certain organs.”
https://www.lemonde.fr/en/environment/article/2026/04/01/pesticides-and-cancer-for-the-first-time-researchers-find-a-connection-at-the-national-level_6752016_114.html
Pesticides and cancer: For the first time, researchers find a connection at the national level

French researchers have developed a model to map pesticide exposure across Peru to reported cancer clusters. They demonstrate a 'robust spatial association' between these chemicals and increased cancer incidence rates in over 400 areas.

Le Monde
@markmetz Wow! I just skimmed the Nature Health paper. What a tour de force! This is a transformative study in many ways - the geospatial analysis of pesticide exposures at 100m x 100m grid across the entire nation, using monthly weather data, the cross-validation with hair analysis and agrochemical retailer surveys, the categorization of cancers in the national cancer registry by developmental cell lineage types rather than simply by organ type. I’m blown away by the quality and the extensiveness of this research.

@markmetz Here's the original paper since Le Monde is paywalled

https://www.nature.com/articles/s44360-026-00087-0

Mapping pesticide mixtures to cancer risk at the country scale with spatial exposomics - Nature Health

Using an integrative spatial Bayesian framework that merges high-resolution environmental pesticide risk modelling with comprehensive cancer registry data, this analysis reveals spatial patterns of pesticide exposure and liver tissue-derived molecular signatures across Peru, establishing links between pesticide usage and cancer insurgence at the national scale.

Nature
@subterfugue @markmetz paywalling an article reporting on an open access paper is certainly a choice
@markmetz Imagine it being 2026 and they are just getting the gist of this?!