Cancer and inequality: a small prompt gets people to report false cancer cures

False cancer cures are easy to find on social media, and people with cancer and their caregivers see them all the time. Misinformation can deepen cancer and inequality, and this study found a simple tool that helps.

When a small prompt appeared on a post with a false treatment claim, people reported the post far more often and liked it far less. You may not run a social media platform, but you do see these posts. You are the person who can report them.

How the study worked

Researchers ran a randomized clinical trial with 294 US adults, ages 18 to 65, who either had cancer or cared for someone who did. Between March 31 and May 12, 2025, they used a realistic simulated social media platform and saw posts with false cancer treatment claims. By chance, 88 people saw posts with prompts that told them what other users had done and described a review policy, 92 saw standard prompts, and 114 saw no prompts. The results were published Oct. 1, 2026, in JAMA Network Open. The platform was simulated and the people knew they were in a study, so real apps may behave a little differently.

What they found

Prompts made a big difference in what people did with false posts. Posts with no prompt were flagged 12% of the time. With standard prompts, 26% were flagged. With the social-cue prompts, which mention what others did, 38% were flagged. That is 2 to 3 times more reporting than with no prompt.

Likes dropped just as sharply. Only 3% of posts with social-cue prompts and 1% with standard prompts were liked, compared with 10% of posts with no prompt.

People also said they were more willing to flag and dislike these posts, and less willing to like and share them. One more result stands out. Standard prompts led people to flag more on their own real social media accounts, outside the study platform.

What is a prompt, exactly?

A prompt is a short message that appears on or next to a post. The standard version simply invites you to act. The social-cue version tells you what other people did and explains that posts are reviewed. In this trial, both versions worked. Both moved people from scrolling past to taking action.

Why this is good news

Platforms count on users to report harmful content. This trial shows that small, low-cost design choices can nudge people to do it. The researchers concluded that simple prompts encouraged responsible behavior online, with more intervening and less sharing of cancer misinformation.

It also shows something about you. People with cancer and caregivers, who see these claims most, were ready to act when given a gentle push.

What you can do today

You do not need a prompt to do what the people in this study did. The next time you see a post promising a cancer cure, tap the report button instead of liking or sharing it. Reporting takes a few seconds, and it is the same action that went up from 12% to 38% in this trial.