がん患者・家族の生成AI利用状況に関する調査報告 (Survey Report on Generative AI Use by Cancer Patients and Their Families)

Key Findings

• — Generative-AI use for cancer consultation or information was 6.7% among patients and 7.5% among family members, highest in people in their 30s; consultation with medical staff was 47% (patients) and 42% (families)
• — Among AI-using patients, the most common topics were cancer-treatment information (62.9%) and symptoms, side effects and after-effects (60.6%)
• — 66.2% of AI users in the follow-up module had felt that AI information was wrong (37.6% several times, 23.9% many times)
• — About 70% reported a positive behaviour change (around 40% understood their illness or treatment better, around 30% found it easier to prepare for appointments); free-text answers also included confusion, anxiety after contradicting the doctor and 'stopped going to hospital'
• — Use was higher the shorter the time since treatment began, highest among patients within three months

Methodology Notes

Internet survey, 23-26 March 2026, about 10,000 cancer patients and family members aged 15-89 across Japan; follow-up questions to 427 AI users treated within the past year. The report does not separate first diagnosis from recurrence and notes the subgroup samples are small. Self-report. Sample size is stated as about 10,000 (約1万人); sample_size is approximate. Figures read on the jcancer.jp report page (dated 2026-06-18).

Sources