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https://www.productionai.institute/graph/events/evt-aiid-1426

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Production AI Institute public record · AI Incident Database: Perplexity AI Reportedly Misstated CLL Research, Allegedly Contributing to Delayed Treatment and Prolonged Suffering · observed 2026-01-26
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AI Incident Database: Perplexity AI Reportedly Misstated CLL Research, Allegedly Contributing to Delayed Treatment and Prolonged Suffering

Joseph Neal Riley reportedly used Perplexity AI to self-diagnose a rare complication of chronic lymphocytic leukemia (CLL) and, based on that output, allegedly delayed an oncologist-recommended Ven-Obi treatment for about a year. His son, Benjamin Riley, alleges that Perplexity misstated the medical research it cited, a conclusion he purportedly later confirmed with the study's authors.

AI Incident Database · Incident 1426

Operator lens (medium): inspect D2 (output validation), D4 (observability), D6 (autonomy oversight).

Confidence
78%
Sources
2
Entities
5
Detected
detected 225d ago

Event summary

Joseph Neal Riley reportedly used Perplexity AI to self-diagnose a rare complication of chronic lymphocytic leukemia (CLL) and, based on that output, allegedly delayed an oncologist-recommended Ven-Obi treatment for about a year. His son, Benjamin Riley, alleges that Perplexity misstated the medical research it cited, a conclusion he purportedly later confirmed with the study's authors.

D2D4D6

Linked entities

  • Perplexity

    vendor | 70%

  • joseph-neal-riley

    organisation | 70%

  • benjamin-riley

    organisation | 70%

  • epistemic-integrity

    organisation | 70%

  • people-seeking-medical-advice

    organisation | 70%

Related graph edges

EdgeTypeConfidence
ent-vendor-perplexity to ent-psf-d1maps to60%
ent-vendor-perplexity to ent-psf-d1maps to60%
ent-vendor-perplexity to ent-psf-d1maps to60%
ent-vendor-perplexity to ent-psf-d2maps to60%
ent-vendor-perplexity to ent-psf-d2maps to60%
ent-vendor-perplexity to ent-psf-d2maps to60%
ent-vendor-perplexity to ent-psf-d6maps to60%
ent-vendor-perplexity to ent-psf-d6maps to60%
ent-vendor-perplexity to ent-psf-d6maps to60%
ent-vendor-perplexity to ent-psf-d2maps to60%
ent-vendor-perplexity to ent-psf-d2maps to60%
ent-vendor-perplexity to ent-psf-d2maps to60%

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Event dates

  • Happened 5 Jan 2026

  • Detected 26 Jan 2026

Sources

  • AI Incident Database - Incident 1426

    secondary | checked 9 July 2026

    Open source
  • The role of AI in the death of my father

    secondary | checked 26 Jan 2026

    Open source
Cite this record

"AI Incident Database: Perplexity AI Reportedly Misstated CLL Research, Allegedly Contributing to Delayed Treatment and Prolonged Suffering." https://www.productionai.institute/graph/events/evt-aiid-1426 (observed 2026-01-05; retrieved 2026-09-08). PAI.

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