08/14/2026
Earlier this summer, Professor of Epidemiology Katherine Reeves traveled to Lyon, France, to join a working group for the International Agency for Research on Cancer (IARC), the specialized cancer agency of the World Health Organization. The team looked at studies on the carcinogenicity of three chemicals: butyl benzyl phthalate, dibutyl phthalate and diisononyl phthalate, substances common in everyday items ranging from PVC and cable coatings to dust and personal care products.
Reeves was a member of the working group of 23 scientists from 13 countries who met to finalize their evaluation for the latest IARC Monograph. Their findings, reported in The Lancet, indicated that these chemicals are “possibly carcinogenic,” based on “strong” mechanistic evidence in experimental systems, but more research is needed regarding their impact on humans.
“There is definitely support from these laboratory studies and these animal studies that these agents can act in ways that we know can be carcinogenic,” Reeves said. “However, the study in humans is insufficient. And so, there's an opportunity for future research to hopefully give more information within humans as to whether or not these agents are carcinogens.”
Katherine Reeves traveled to France in June to join a working group for the International Agency for Research on Cancer, the WHO's specialized cancer agency.