Prof. Koji Ono: A pioneer of clinical applications of BNCT devoted to exploring its new possibilities
Meet the Professor

Prof. Koji Ono: A pioneer of clinical applications of

Received: 26 February 2018; Accepted: 11 April 2018; Published: 29 April 2018.

doi: 10.21037/tro.2018.04.04

Editor’s note

The 3rd Annual Academic Conference of Taiwan Society of Neutron Capture Therapy was held successfully at Taipei Medical University on 17 January, 2018. Many Japanese Boron Neutron Capture Therapy (BNCT) experts were invited to this conference to share and discuss their experiences on clinical applications of BNCT and its future development from nuclear medicine, clinical application and chemistry aspects. At this conference, we Therapeutic Radiology and Oncology (TRO) had the great honor to invite Prof. Koji Ono from the Kansai BNCT Medical Center, Osaka Medical College, Osaka, Japan to have an exclusive interview with us, leading our readers to learn more about the new era of BNCT (Figure 1).

Figure 1 Photo with Prof. Koji Ono after the interview.

Expert introduction

Prof. Koji Ono (Figure 2) is the director of the Kansai BNCT Medical Center, Osaka Medical College, Osaka, Japan. In 1974, he graduated from the Medical School, Kyoto University. Then, he worked as an assistant professor at Kawasaki Medical School's radiation therapy department and at Kyoto University Hospital. After that, he did his postdoctoral research at the Radiation Oncology Research Laboratory UC San Francisco, and was a visiting researcher at the Institute for Medical Radiation Biology of University of Duisburg-Essen. In 1989, he became a lecturer on radiation oncology at Kyoto University's medical department. In 1991, he was a professor at the Research Department for Reactor Medicine of Kyoto University Research Reactor Institute. In 1992, he became the head of the department, and in 2005 he became the head of the Particle Radiation Oncology Research Center. He was also the first director of the Japanese Society of Neutron Capture Therapy (JSNCT).

Figure 2 Photo of Prof. Koji Ono.

TRO: Could you briefly introduce yourself to the audience?

Prof. Ono: I was born in Shikoku and moved to Kyoto to go to Kyoto University when I was young. I entered Kyoto University in 1968 and graduated from Kyoto University Medical School in 1974. I spent three years in Kyoto University Hospital to receive the training as a radiologist. After that, I moved to Kawasaki Medical School in Kurashiki, Okayama, Japan and spent two and a half years there. When I came back to Kyoto University, I did thesis research for a PhD degree. After that, I stayed at Kyoto University for a long time. From 1984 to 1986, I did postdoctoral research at the University of California, San Francisco in the United States and went to University of Duisburg-Essen in Germany as a visiting researcher.

TRO: How long have you devoted yourself to BNCT research?

Prof. Ono: I started it from 1987. It was the year when Professor Mishima, a professor of dermatology at Kobe University Medical School, did the BPA-BNCT on the first malignant melanoma patient in the world at Kyoto University Research Reactor Institute. At that time, Dr. Junichi Hiratsuka who was also a staff of Professor Mishima and I became friends. Four years later, in 1991, I became a full professor at the Kyoto University Research Reactor Institute. Then I had worked there until retirement. Since 2013, I have been an Emeritus Professor of Kyoto University.

TRO: Have you ever met any unforgettable moments while devoting yourself to BNCT research?

Prof. Ono: The first patient of head and neck cancer I treated with BNCT was a very advanced case, which is an irregular and particular case. The patient was a middle-aged woman and she had a big tumor in her face. Large area of the skin was destroyed by the cancer. She was suffering from the pain and continuous bloody exudate from the lesion. This was the first head and neck cancer case treated with BNCT in the world. I asked the committee just before I did BNCT on her, and one of the committee member said to me, “Dr. Ono, you probably would like to do the BNCT on this patient; however, there is no experience at all now. Therefore, we must be very careful. If there are some undesired negative effects, for example, severe damage to the skin, please avoid such adverse effect. Please reduce the neutron dose to the 50% of your final dose.” Then I treated her with BNCT. After applying BNCT, two or three days later, I visited her at the hospital. I was very surprised because she was not suffering from any pain after the treatment. And also the exudate remarkably decreased in volume. One month later, I applied the BNCT on her again, and finally, such a huge size tumor completely disappeared. That was a very important case not only for me but also for the history of BNCT. That was a very interesting case and an attending physician of Osaka University presented this case at an international meeting that was held in Essen, Germany in 2002. After the audience saw the slide, they were astonished by the effect of BNCT. The atmosphere of the meeting room quickly changed. After his presentation, many people came to me and asked, “Could you please provide a slide for us.”

TRO: As the director of the Japanese Society of Neutron Capture Therapy, do you have any suggestions to young Japanese doctors or physicists who would like to devote themselves to BNCT research?

Prof. Ono: I would say that BNCT is a bit complicated treatment in comparison with other particle therapy or X-ray therapy. Therefore, there are many things to do and many topics for research. I would suggest young doctors to give it a try. For example, in this meeting I proposed a new concept of biological equivalent dose for BNCT. There are many interesting topics that we have to solve before completing the BNCT technique.


Funding: None.


Provenance and Peer Review: This article was commissioned by the editorial office, Therapeutic Radiology and Oncology for the series “Meet the Professor”. The article did not undergo external peer review.

Conflicts of Interest: The author has completed the ICMJE uniform disclosure form (available at The series “Meet the Professor” was commissioned by the editorial office without any funding or sponsorship. Tan Lun Yu reports that she is a full-time employee of AME publishing company (publisher of the journal). The author has no other conflicts of interest to declare.

Ethical Statement: The author is accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.

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(Science Editor: Tan Lun Yu, TRO,

doi: 10.21037/tro.2018.04.04
Cite this article as: Yu TL. Prof. Koji Ono: A pioneer of clinical applications of BNCT devoted to exploring its new possibilities. Ther Radiol Oncol 2018;2:19.

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