Tools · Tool 01 — open now

Some exposures cause cancer. Some might. Telling them apart is the whole job.

Every mark behind this text is real: 186 exposures, 68 types of cancer, and the 466 links the World Health Organization's cancer agency has recorded between them.

Established link Suspected link Cancer site

What is in here

Every exposure the IARC has linked to a cancer, graded by how certain the evidence is.

186

Exposures

Cancer types

466

Recorded links

141a

Monograph volumes

Established link247 — Sufficient evidence in humans

Studies in people agree closely enough to rule out chance, bias and other explanations. This is the strongest conclusion the IARC draws.

Suspected link219 — Limited evidence in humans

There is a credible association, though chance or bias could still explain it. The question remains open, and more research may settle it either way.

Before you draw conclusions

Three limits of this map, worth knowing before you read it.

Hazard and risk

Something that can cause cancer may still have had nothing to do with yours.

A Group 1 classification means an exposure can cause cancer under some conditions. How much, for how long, at what age, and which genes you carry all stand between that finding and any one person.

Gaps in the map

A missing link may only mean nobody has looked hard enough yet.

The map records what has been studied and reviewed. Many gaps come from limited research funding or short follow-up time, so an empty space here is weak evidence of safety.

Whole populations

This map describes populations, and cannot judge any single case.

If you are living with a cancer diagnosis, the people treating you know things about your case that no population map contains. Bring your questions to them.

Open the tool

Start from a cancer. Start from an exposure. Or open the whole map.

Free, no account needed, available in ten languages. Drag, zoom, and focus on any part of the network.

Open the Cancer Evidence Explorer →

Source: IARC Monographs, "Classifications by cancer site", Volumes 1–141a (last update 18 May 2026), adapted from Schubauer-Berigan et al., JNCI Monographs 2026. This tool identifies hazards across whole populations. For anything concerning your own health, speak to a doctor.