Brain tumours

Four questions people ask, put to Google AI Overviews, Google AI Mode and ChatGPT in November 2026.

Got the NHS facts right
Got the NHS facts right
Got the NHS facts right
Got the NHS facts right
Cited NHS or accredited sources
Cited NHS or accredited sources
Cited NHS or accredited sources
Cited NHS or accredited sources

The questions

Question
The NHS says
AI Overviews
AI Mode
ChatGPT
What is the survival rate for a cancerous brain tumour?
About 17 in 100 survive 5 years
Google AI Overviews Matches the NHS
The NHS says about 17 in 100 survive 5 years
●Different on AI Mode Google AI Mode Contradicts the NHS
The NHS says about 17 in 100 survive 5 years
●Didn’t say on ChatGPT ChatGPT (logged out) Does not say
The NHS says about 17 in 100 survive 5 years
Do brain tumours only happen in older people or can children get them?
Any age
Google AI Overviews Matches the NHS
The NHS says can affect any age
Google AI Mode Matches the NHS
The NHS says can affect any age
ChatGPT (logged out) Matches the NHS
The NHS says can affect any age
can brain tumours be cured
No single NHS line
·
·
·
is brain tumours hereditary
No single NHS line
·
·
·
Matches the NHS Differs from the NHS

Where the answers came from

Answers, of 1 with sources
NHS websiteNHS1
Cancer Research UKUK charity on the PIF TICK list1
UK charities for brain tumours BrainstrustCancer Research UK