# Japan Clinical Oncology Group (JCOG)

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

## TL;DR

JCOG is Japan's national cooperative group and defines surgical and perioperative standards in gastric and oesophageal cancer.

## Summary

The Japan Clinical Oncology Group, established in 1990 and based at the National Cancer Center in Tokyo, is Japan's national cooperative group and defines surgical and perioperative standards in gastric and oesophageal cancer. JCOG9501 compared D2 gastrectomy with and without para-aortic dissection, JCOG1109 tested neoadjuvant docetaxel, cisplatin and fluorouracil in oesophageal cancer, and its lung and colorectal surgical trials set standards across Japan, with Haruhiko Fukuda and Yuko Kitagawa among the people linked. OnCo connects it to gastric, oesophageal and non-small-cell lung cancer, to the Japanese oncology guidelines collection, and to member hospitals including Aichi Cancer Center and Kyoto, Keio and Kyushu university hospitals. Surgery and radiotherapy getting the least trial money is the bottleneck it works against. Its surgical and perioperative programmes are listed in the notes.

## Fields

- Kind: Company
- Last checked: 2026-09-06
- Also known as: Japan Clinical Oncology Group; JCOG
- Tags: cooperative-group
- HQ: Tokyo
- Type: cooperative-group
- Website: https://jcog.jp

## Notes

- Gastric cancer surgery trials
- Oesophageal cancer perioperative therapy

## Sources

- Official website: https://jcog.jp

## Connected records

- cancers: [Early gastric cancer](https://onco.cc/cancers/early-gastric-cancer/), [Gastric & gastro-oesophageal junction cancer](https://onco.cc/cancers/gastric/), [Non-small-cell lung cancer](https://onco.cc/cancers/nsclc/), [Oesophageal cancer](https://onco.cc/cancers/esophageal/), [Resectable stage I to III non-small-cell lung cancer](https://onco.cc/cancers/resectable-nsclc/)
- institutions: [Aichi Cancer Center](https://onco.cc/institutions/aichi-cancer-center/), [Japanese Society of Medical Oncology](https://onco.cc/institutions/jsmo/), [Keio University Hospital](https://onco.cc/institutions/keio-university-hospital/), [Kyoto University Hospital](https://onco.cc/institutions/kyoto-university-hospital/), [Kyushu University Hospital](https://onco.cc/institutions/kyushu-university-hospital/), [National Cancer Center Hospital](https://onco.cc/institutions/ncc-japan/), [National Cancer Center Hospital East](https://onco.cc/institutions/ncc-hospital-east/), [Osaka International Cancer Institute](https://onco.cc/institutions/osaka-international-cancer-institute/), [Shizuoka Cancer Center](https://onco.cc/institutions/shizuoka-cancer-center/)
- trials: [JCOG0403](https://onco.cc/trials/jcog0403/)
- people: [Haruhiko Fukuda](https://onco.cc/people/fukuda-haruhiko/), [Yuko Kitagawa](https://onco.cc/people/kitagawa-yuko/)
- bottlenecks: [Surgery and radiotherapy cure most, get least](https://onco.cc/bottlenecks/b-surgery-radiation-innovation/), [Trials enrol too few, too slowly](https://onco.cc/bottlenecks/b-trial-enrolment/)
- ideas: [A permanently funded international network for randomised cancer surgery trials](https://onco.cc/ideas/idea-fund-surgical-trials-network/)
- collections: [Japanese oncology guidelines (JSMO, JSCO and organ societies)](https://onco.cc/collections/jsmo-jsco-guidelines/)
- companies: [West Japan Oncology Group](https://onco.cc/companies/wjog/)

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