Prevention we already have is not deployed

Around four in ten cancers are preventable with tools that exist now. This would fund the hard, unglamorous work of getting vaccines, screening and tobacco control to everyone, paid on results.

CHALLENGE proved exercise works in colon cancer but not how much is needed. A trial comparing doses, as we would for a drug, would tell health systems what to fund.

People with Lynch syndrome have a very high lifetime cancer risk from a predictable set of mutations. Vaccinate them against those shared mutations before cancer appears.

People with cirrhosis have a high risk of liver cancer, and those who happen to take statins seem to get it less often. A proper trial would settle whether statins should be prescribed for prevention.

Lynch syndrome tumours share predictable mutations the immune system can target. A vaccine in early trials could be tested to see if it prevents polyps and cancers in carriers.

People are invited separately for bowel, breast, cervical and lung screening and many miss some. One appointment offering all eligible tests, plus a risk assessment, would raise uptake.

A pill on a string collects cells from the food pipe and finds Barrett's oesophagus, a precursor of cancer. Offering it in pharmacies to people on long-term heartburn drugs would find it early.

Precancer is treated by cutting away part of the cervix, which raises pregnancy risks. A vaccine that makes the immune system clear the infected cells would avoid surgery.

Obesity raises the risk of 13 cancers. Weight-loss drugs are now widely used; a large trial should test whether they actually prevent cancer, not just diabetes and heart disease.

A childhood vaccine against the stomach bacterium behind most stomach cancer would prevent infection for life. One trial in China showed protection; the idea has stalled.

Instead of separate screening programmes for a few cancers, assess every adult's overall cancer risk and offer blood tests, imaging and preventive treatment tuned to that risk, all inside one system that learns.

EBV infects almost everyone and causes nasopharyngeal cancer, some lymphomas and some stomach cancers. A vaccine given before infection could remove those cancers.

H. pylori eradication often fails because of antibiotic resistance. A stool DNA test showing which antibiotics will work would raise cure rates and protect antibiotics.

Sunbeds cause melanoma, especially when used young. Australia and Brazil have banned them. Other countries should follow and measure the effect.

Fear of losing insurance stops many people having genetic tests. Extending non-discrimination law to life and disability cover, as Canada has, would remove that fear.

Most people do not know alcohol causes seven cancers. Ireland is putting cancer warnings on bottles; other countries should follow and measure the effect on drinking.

HPV throat cancer now exceeds cervical cancer in some countries and mostly affects men, who were not vaccinated. Vaccinating men up to 45 could reduce it.

Pharmacies are everywhere and open late. They could give HPV vaccines, hand out bowel test kits, run stop-smoking clinics and offer HPV self-sampling under one roof.

The HPV vaccine prevents most cervical cancer, but false safety claims have cut uptake in several countries. Rebuild confidence locally and deliver the vaccine in schools.

We do not know whether ultra-processed food raises cancer risk because it makes people fat, or because of something in the food itself. Feeding volunteers matched diets for a few weeks and measuring cancer-relevant biology can tell the two apart.

Hepatitis C is now curable in weeks. Testing and treating where it is concentrated, and keeping those with scarring in surveillance afterwards, would cut liver cancer.

About one in eight cancers is caused by an infection we can vaccinate against, cure or eradicate. A concerted global programme could make those cancers rare within a generation.

Scotland and Wales put a floor under the price of alcohol. Deaths from liver disease have already fallen. Cancer takes longer to show, so someone has to keep measuring for a decade.

Air pollution causes lung cancer in people who never smoked. Clean air zones and coal phase-outs should be tracked against never-smoker lung cancer rates.

Lung screening is a teachable moment. Giving cessation medicine and support by default at every scan, unless the person opts out, roughly doubles quit rates.

Stomach cancer is largely caused by a bacterium that spreads in households. Testing and treating whole families, not individuals, would stop reinfection and prevent cancer.

Aspirin roughly halves bowel cancer in Lynch syndrome, and a dose trial is defining how little is needed. Most carriers are still not prescribed it; the task is to fix prescribing.

Womb precancer in women with obesity is usually treated with a hormone coil or hysterectomy. Weight-loss drugs might reverse it and protect fertility.

Women can collect their own sample for the virus that causes cervical cancer; those who test positive can be treated the same day with a simple heat device. Done nationally, this could eliminate a disease that still kills hundreds of thousands of women a year.

Millions of people have had weight-loss surgery or now take weight-loss drugs. Linking those records to cancer registries would show, cancer by cancer, how much reversing obesity prevents, for almost no cost.

A 5 mg tamoxifen dose halves breast cancer recurrence after precancer with far fewer side effects than the full dose. Almost nobody is prescribed it. Change who can prescribe.

Dentists see the mouth more than any doctor. A standard, recorded oral cancer examination with a referral route would catch cancers earlier at almost no cost.

Cigarettes with nicotine cut by 95% do not sustain addiction. A mandatory cap, which the FDA has proposed, could cut smoking dramatically.

Radon gas from the ground is the second biggest cause of lung cancer. Testing every home at sale and paying for fixes in high-radon areas would prevent thousands of cases.

Scotland's minimum price per unit cut alcohol deaths. Tracking alcohol-related cancer incidence over the next decade would show whether it also prevents cancer.

Adult women who missed the vaccine could get it at their screening visit. Vaccination around treatment for precancer also seems to cut recurrence.

Blood tests for bowel cancer miss most precancerous polyps, so they should not replace stool tests. But for the third of people who never do any screening, a blood test may beat nothing.

Prevention trials are slow and run separately. A shared platform trial across precancers like Barrett's, oral leukoplakia, lung nodules and pancreatic cysts would test many drugs faster.

Health systems earn from treating cancer, not preventing it. Paying them for lower cancer incidence and earlier stage in their population would flip the incentive.

Most people carrying a high-risk cancer gene do not know it until someone in the family gets cancer. Offer testing to all adults so carriers can be protected before that happens.

Many women never book a smear test. Sending a self-sampling kit by post, as the Netherlands and Australia do, reaches them and is just as accurate.

Cytisine costs a few dollars per course and works about as well as varenicline, but is unavailable in most countries. Global approval and procurement would make quitting affordable.

Few companies develop cancer prevention drugs because trials take decades. If regulators accepted validated precancer endpoints, as they do cholesterol for heart disease, industry would return.

Most ovarian cancers start in the fallopian tubes. Removing the tubes at hysterectomy, or instead of tying them, as British Columbia has done, appears to prevent ovarian cancer.

Where women cannot return for results, test for HPV and treat any precancer the same day with a battery-powered heat probe. This is the fastest route to WHO's cervical elimination target.

Uptake rises when the invitation comes with a booked appointment and text reminders. Make that the default in every screening programme.

Banning tobacco sales to anyone born after a set year, as the UK is doing, could end smoking within a generation. Adopting countries should coordinate evaluation so the evidence is undeniable.

Investors would fund vaccination and screening campaigns up front and be repaid by health systems only if the campaigns hit verified targets, turning future savings into money for prevention now.

One dose of HPV vaccine protects as well as two or three. Halving the doses frees supply to vaccinate far more girls, boys and young adults.

People most at risk of lung cancer are least likely to attend hospital screening. Manchester showed mobile scanners in car parks reach them. Make this the default model.

Hepatitis B causes most liver cancer worldwide, and cheap tablets suppress it. Treating everyone infected, not just those with liver damage, would prevent many cancers.