# ResistanceBio (Viosera Therapeutics)

Source: https://onco.cc/companies/resistancebio/  
OnCo record `resistancebio` (Company). Data CC BY-NC 4.0, attribute "Data from OnCo (onco.cc)"; commercial use needs a licence.

## TL;DR

ResistanceBio set out to design drugs that stop cancers becoming resistant to treatment. The company is no longer active.

## Summary

ResistanceBio, incorporated as Viosera Therapeutics, aimed to solve acquired drug resistance in cancer by modelling how tumours evolve under therapy and designing compounds against the resistance routes. It grew to about 15 people with sites in San Francisco and the St. Louis area before the YC directory marked it inactive. Recorded here as wound down; no acquirer or successor is named because none was found in a primary source.

## Fields

- Kind: Company
- Last checked: 2026-09-10
- Tags: yc
- HQ: San Francisco, CA
- Type: biotech
- Website: https://www.ycombinator.com/companies/viosera-therapeutics

## Sources

- Y Combinator profile: https://www.ycombinator.com/companies/viosera-therapeutics

## Connected records

- fronts: [Drug Discovery Platforms](https://onco.cc/fronts/drug-discovery/), [Targeted Therapy](https://onco.cc/fronts/targeted-therapy/)
- technologies: [AI-driven drug & target discovery](https://onco.cc/technologies/ai-drug-design/)
- companies: [Y Combinator](https://onco.cc/companies/y-combinator/)

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JSON: https://onco.cc/api/v1/entities/resistancebio.json