# Hospital General Universitario Gregorio Marañón

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

## TL;DR

Gregorio Marañón is a Madrid public hospital with a leading breast cancer research group (GEICAM).

## Summary

Hospital General Universitario Gregorio Marañón is a Madrid public hospital ranked fortieth in the Newsweek/Statista World's Best Specialized Hospitals list for oncology, and it matters for breast cancer research. Its breast oncology group is associated with Miguel Martín, founder of the GEICAM Spanish Breast Cancer Group, and Sara López-Tarruella, and it also has a gastrointestinal oncology programme. OnCo links it to HR-positive, HER2-negative breast cancer and to triple-negative breast cancer, and GEICAM has its own institution page. How an academic cooperative group housed in a public hospital keeps influence as breast trials become industry-led is the question its history raises. Its breast programme is the reason to read on.

## Fields

- Kind: Institution
- Last checked: 2026-09-04
- City: Madrid, ES
- Type: hospital
- Website: https://www.comunidad.madrid/hospital/gregoriomaranon

## Sources

- Wikipedia: https://en.wikipedia.org/wiki/Hospital_General_Universitario_Gregorio_Mara%C3%B1%C3%B3n
- Official website: https://www.comunidad.madrid/hospital/gregoriomaranon

## Connected records

- cancers: [HR-positive / HER2-negative breast cancer](https://onco.cc/cancers/breast-hr-positive/), [Triple-negative breast cancer (TNBC)](https://onco.cc/cancers/tnbc/)
- people: [Miguel Martín](https://onco.cc/people/miguel-martin/), [Sara López-Tarruella](https://onco.cc/people/sara-lopez-tarruella/), [Sonia García de San José](https://onco.cc/people/sonia-garcia-de-san-jose/)
- institutions: [Hospital Clínico San Carlos](https://onco.cc/institutions/clinico-san-carlos/), [Hospital Universitario de La Princesa](https://onco.cc/institutions/la-princesa/), [Hospital Universitario Ramón y Cajal](https://onco.cc/institutions/ramon-y-cajal/)
- companies: [GEICAM Spanish Breast Cancer Group](https://onco.cc/companies/geicam/)

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JSON: https://onco.cc/api/v1/entities/gregorio-maranon.json