# Zebrafish avatars for a drug answer within a week

Source: https://onco.cc/ideas/idea-bio1-zebrafish-avatars/  
OnCo record `idea-bio1-zebrafish-avatars` (Idea). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

Tumour cells injected into transparent fish embryos grow in days, so several drugs can be compared in about a week, fast enough to help a patient who cannot wait.

## Summary

Zebrafish patient-derived xenografts accept small cell numbers, are transparent for direct imaging of growth and metastasis, and give readouts in five to ten days at a fraction of mouse cost. Studies in colorectal and other cancers report concordance with patient outcomes. They lack an adaptive immune system and drug metabolism differs, so their role is rapid triage rather than definitive prediction.

## Fields

- Kind: Idea
- Last checked: 2026-09-08
- Hypothesis: Zebrafish avatar drug ranking agrees with matched mouse PDX ranking in most cases and can be delivered in under two weeks from biopsy, making it usable in real clinical timeframes.
- Rationale: Speed and sample requirement are the binding constraints on functional testing in advanced disease; a triage assay with even moderate accuracy has value if it narrows options before slower assays.
- Proposed test: Head-to-head on 50 patient samples: zebrafish, organoid and mouse rankings compared with each other and with the patient's response to the chosen regimen.
- Maturity: preclinical-evidence
- Actor: research

## Sources

- Bottleneck evidence (Lab models that fail to predict what happens in patients): Wong, Siah & Lo, Estimation of clinical trial success rates (Biostatistics 2019): https://doi.org/10.1093/biostatistics/kxx069

## Connected records

- cancers: [Colorectal cancer](https://onco.cc/cancers/colorectal/), [Pancreatic ductal adenocarcinoma](https://onco.cc/cancers/pancreatic/)
- technologies: [Functional (ex vivo) drug testing](https://onco.cc/technologies/functional-drug-testing/), [Patient-derived xenografts](https://onco.cc/technologies/pdx-models/)
- bottlenecks: [Lab models that fail to predict what happens in patients](https://onco.cc/bottlenecks/b-preclinical-models/)
- key papers: [Estimation of clinical trial success rates and related parameters](https://onco.cc/key-papers/paper-wong-biostatistics/)

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