about "ICHUSHI"

Message from the President


Document retrieval is the most important work for researchers. To grasp the already investigated matters and still unsolved ones about a theme with the interest is the first indispensable step to begin a new study. For the clinician it is an important thing to refer to a past case in curing with a diagnosis.
The Japan Medical Abstract Society (JAMAS) accumulated medical literature information published in Japan for 116 years since 1903, and already built the search system named “Ichushi-Web” containing more than 13 million data.

In 2018 we started a new contract system named "access free plan" which permit simultaneous and unlimited access easily anywhere anytime.
In addition we released "the smartphone screen design " for the user of smartphone. We fixed the available environment to do document retrieval easily for the user.
We finished to collect the bibliography information as digitization retroactively to 1964 at a stage in December, 2018. We named it as "OLD Ichushi Project" and will end this work by 2020. In this way we offer historically important article information.

In 2018, we also improved several other search functions.
In 2019, we are planning to upgrade the version so that not only the thesis but also the information of the book will be searched.

To search in Japanese and the shown information in Japanese are the greatest advantage for the both sides of author and user of Ichushi-Web.
The Japanese thesaurus supporting an appropriate search follows Medical Subject Headings(MeSH) by National Library of Medicine(NLM).

Currently, in the world of SNS, fake news is overflowing.
In that situation, Ichushi-Web connects authors and users by providing accurate information on medical papers.

Yousuke Seyama, M.D., Ph.D.
December 25, 2018

Profile of the President


"Igaku Chuo Zasshi (ICHUSHI)" is a bibliographic database that was established in 1903 and is being updated by the Japan Medical Abstracts Society (JAMAS), a non-profit and non-governmental body. Ichushi contains bibliographic citations and abstracts from more than 2,500 biomedical journals and other serial publications published in Japan. The online version, "Ichushi-Web", was started in January 2000 and is now accessed by almost all medical, dental, nursing, and other health-sciences schools and institutions nationwide and by many individual scientists, healthcare professionals, and consumers.


Founding of JAMAS and Shiro Amako

Shiro Amako
Shiro Amako (1865-1930)

The history of indexing and abstracting service of medical literature started in 1879, with the first publication of Index Medicus in the United States. JAMAS was established 24 years later, in 1903, as a journal modeled after Centralbratt fur die Gesamte Medicin, which is a German medical abstracting journals. JAMAS is the second oldest continuing medical literature indexing and abstracting publication, following Index Medicus.

The first issue of ICHUSHI
The first issue of ICHUSHI

The first president of JAMAS, Shiro Amako, MD (1865-1930), graduated from Hiroshima Medical School. After helping found the Geibi Medical Society (now the Hiroshima Medical Society), he started his own practice in Yanaka, Tokyo, in 1903, and founded JAMAS the same year. During the early year of his practice, he had a close relationship, both as a doctor and a freiend, with Soseki Natsume, a famous novelist who lived in the same town. "Amagi-sensei" in "I Am a Cat" was supposedly based on Shiro Amako.

The first issue of ICHUSHI archived in "NDL (National Diet Library) Digitized Contents"

Continuance of Business

Fujiro Amako
Fujiro Amako (1892-1972)

Fujiro Amako, M.D., Ph.D. (1892-1972) son of Shiro Amako, took over the business of JAMAS. He kept on publishing ICHUSHI even during the Second War. After he passed away, each of Mototaka Murakami, M.D., Ph.D. (1914-1989), Tsuneki Shinohara, M.D., Ph.D. (1929-2010) and Yousuke Seyama, M.D., Ph.D. (1941-) succeeded this business as a chairman of the Board.

Increased Amount of Information and Release of CD-ROM Version

In 1903, the year JAMAS was founded, only 1,865 articles and 64 journals were indexed. As medical science advanced, the number of articles continued to increase. By the 1980's, the number of articles exceeded 200,000 and the number of journals exceeded 2,000. To make efficient use of such an enormous amount of data, the "Ichushi CD", a CD-ROM version of JAMAS, was released in 1992.

The Internet and JAMAS

"Ishu-Shi Web", the Internet-based retrieval service, started in 2000.

Organizational Transition

Given the highly public nature of its operations, in 2002 Japan Medical Abstracts Society (JAMAS) became a nonprofit organization recognized by the Japanese government.

About Ichushi-Web

Ichushi Web
Ichushi Web

"Ichushi-Web" is an exhaustive collection of Japanese biomedical literature. The number of citations in the database increases by more than 300,000 per year and now exceeds over 14 million citations.

Source of Data

Data in the "Ichushi-Web" are collected from a wide range of sources, such as journals published by academic societies, professional journals published by medical publishers, bulletins released by schools, and research reports published by public and private organizations and institutions.

Manual Indexing Based on the Thesaurus

Trained indexers attach keywords that are relevant to the subject contents of each article, based on the "Thesaurus for Medical and Health-related Terms". The "Ichushi-Web" allows highly accurate searches using these keywords.

"User-friendly Search" and "Advanced Search"

"Ichushi-Web" is designed so that accurate search results can be obtained even when the search is performed with a method similar to that used by Google and other search engines. Users wanting a more precise search can use advanced search functions, such as accessing the thesaurus.

Summary of our Service

User Fees

"Ichushi-Web" is a service targeting corporate and institutional clients, such as universities, hospitals, and private companies. "Ichushi-Web" can be used for a fixed annual fee (starting at 275,000 yen [including Japanese consumption tax].

"Ichushi-Web" Demonstration Version

The search functions of "Ichushi-Web" can be tested without reistration, through a demonstration version of "Ichushi-Web" .


Please contact a sales agent or JAMAS for more information.

NPO Japan Medical Abstracts Society
2-5-18 Takaido-higashi Suginami-ku, Tokyo