History
| April 2004 | Faculty meeting declares "cancer" as the center of medical care at Yamagata University Hospital (Takamasa Kayama, Dean of Faculty of Medicine) |
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| May 2004 | Faculty meeting decides to introduce carbon-ion radiotherapy equipment |
| June 2004 | Establish the Department of Molecular Cancer Science (A new department specializing in basic medical science in cancer was established, and Professor Chifumi Kitanaka was invited from the National Cancer Center) |
| July 2004 | Establish the Advanced Medical Institute in Yamagata : AMIY, Inc. →Financing for the introduction of a carbon-ion radiotherapy facility and drafting of an installation plan. |
| April 2005 | First independent "Faculty of Medicine, Cancer Center" at a national university approved and established. (Director of the Center, Prof. Takamasa Kayama) |
| April 2006 | Establish Department of Radiation Oncology (Radiation Therapy) (Prof. Kenji Nemoto is invited from Tohoku University) |
| June 2006 | Establish Department of Clinical Oncology (Medical Oncology) (Prof. Takashi Yoshioka is invited from Tohoku University) |
| September 2006 | Start Cancer Board |
| December 2006 | Establish Cancer Patient Support Center |
| April 2008 | Establish "Malignant Tumor Research Center" within " Faculty of Medicine, Cancer Center" (Director, Prof. Chifumi Kitanaka) |
| August 2008 | Establish "Tohoku Cancer Network" Composed of Faculty of Medicine of 6 universities in Tohoku and designated cancer hospitals in 6 prefectures, with secretariat at Yamagata University Faculty of Medicine |
| April 2010 | Takamasa Kayama, Dean of the Faculty of Medicine, moves to the National Cancer Center as Chairman of the Board of Directors. Activities to establish a carbon-ion radiotherapy facility suspended. |
| April 2012 | Takamasa Kayama, Chairman of the National Cancer Center, returns to Yamagata University as Special Assistant to the President |
| April 2012 | Installation of carbon-ion radiotherapy equipment is designated as a university-wide project |
| April 2012 | The "Yamagata University Heavy Ion Facility Preparation Office" is organized and activities to install the facility resume. (Office Manager: Takamasa Kayama, Special Assistant to the President) 【Members of the Preparation Office】(at the time of 2012) Director: Takamasa Kayama (Special Assistant to the President), Hidetoshi Yamashita (Dean of Faculty of Medicine), Isao Kubota (Hospital Director), Kenji Nemoto (Professor, Faculty of Medicine), Kazutoshi Kono (Section Chief, Planning Department), Shutoku Konsei (Deputy Section Chief, External Relations Department) |
| September 2012 | "Tohoku Particle Beam Consortium" establishes under the "Tohoku Cancer Network" to study the effective use of the carbon-ion radiotherapy facility in the Tohoku region. ※Takamasa Kayama (Special Assistant to the President) and Hidetoshi Yamashita (Dean of Faculty of Medicine) negotiate budget with MEXT and MOF dozens of times, and receive support from Yamagata Prefecture government and business. |
| February 2013 | The establishment of carbon-ion radiotherapy facility project is selected for a FY2012 supplementary budget (approximately 1 billion yen for research). At the same time, MEXT issued four requests regarding the research. Excerpts from the MEXT notification
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| February 2014 | The project is selected for the FY2013 supplementary budget (approximately 1 billion yen for research), and a network for collecting patients is established using the same funds. The network is set up to connect the six prefectures of the Tohoku Cancer Network with designated cancer hospitals in Niigata Prefecture via a videoconferencing system. |
| March 2014 | Construction of the "Carbon-ion radiotherapy Equipment Research Building" is completed, provided by Mitsubishi Electric Corporation. (Transferred to Yamagata University Faculty of Medicine in 2017) |
| June 2014 | Starts soliciting donations from the private sector (individuals and corporations). |
| January 2015 | Cabinet approves approximately 7 billion yen for the construction of the main building in the budget plan for FY2015 |
| January 2015 | Installation of carbon-ion radiotherapy equipment is effective after Yamagata Prefecture and Yamagata City announced their support for Yamagata University's carbon-ion radiotherapy system has been confirmed with funding in sight. |
| April 2015 | Reorganized as the "Research and Development Office for Next Generation Carbon-ion Radiotherapy Equipment, Yamagata University Faculty of Medicine" and begins full-scale activities (Director: Takamasa Kayama, Supervisor to the Dean, Faculty of Medicine). |
| May 2015 | Design contract and start of work: Nihon Sekkei Inc. |
| September 2015 | Contract for equipment manufacturing: Toshiba Corporation |
| September 2015 | Yamagata Prefecture Municipal Promotion Association announces its support for Yamagata University's carbon-ion radiotherapy system. |
| September 2016 | Establishment of the Council for the Promotion of International Exchange in Advanced Medical Sciences |
| March 2017 | Construction contract and start: Takenaka Corporation |
| April 2019 | Activities begin as "East Japan Heavy Ion Center, Faculty of Medicine, Yamagata University Steering Committee"(Director, Prof. Kenji Nemoto) |
| October 2020 | Start accepting reservations for carbon-ion radiotherapy for prostate cancer. |
| November 2020 | Start consultation for carbon-ion radiotherapy for prostate cancer. |
| December 2020 | Ceremony held to commemorate the opening of the center. |
| February 2021 | Start carbon-ion radiotherapy for prostate cancer. |
| May 2022 | Start carbon-ion radiotherapy for head and neck tumors. |
| July 2022 | Start carbon-ion radiotherapy for postoperative recurrence of colorectal cancer, and bone and soft tissue tumors of the pelvic region. |
| October 2022 | East Japan Heavy Ion Center, Faculty of Medicine, Yamagata University begins full-scale operation. |
| April 2023 | Prof. Takeo Iwai appointed as Director of the East Japan Heavy Ion Center, Faculty of Medicine, Yamagata University |
| July 2024 | Prof. Masashi Koto appointed as Director, Carbon-ion Radiotherapy Center, Yamagata University Hospital |
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