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Dear President Sun and Dr Li,
As the chairman of the PTCOG, I sincerely appreciate for your great contribution to the PTCOG annual meeting. You have done an excellent work to make the PTCOG 46 so successful. I am deeply impressed in your organization of meeting environment as well as the program for the Educational Course and Scientific meeting. I also express appreciation for your colleagues, who were all very kind and sincere to make the meting successful.
It is my great honor and pleasure to accept a professorship to be of any help for the proton therapy at Wanjie. In order to have a meaningful outcome in the charged particle therapy, the protocol design may be very important, and for the past 10 years we have treated most of the patients based on almost 50 protocols. In near future, we can have meetings dedicated to specific tumor sites including the liver, lung, esophagus, so on, and have discussion on the treatment strategy and technical aspect. I and my colleagues are happy to have a collaborative work with you.
If you have any further proposals, please let me know.
Hirohiko Tsujii, M.D.
Director
Research Center for Charged Particle Therapy
National Institute of Radiological Sciences
作为国际粒子（质子）治疗协作委员会的主席，我衷心地感谢你们对国际粒子（质子）肿瘤放射治疗例会所做出的巨大贡献。你们优秀的工作让第46届国际粒子（质子）肿瘤放射治疗大会非常的成功。会议环境和培训班及学术会议议程的安排和组织给我留下了非常深刻的印象。我也非常感谢你们的同事对这次会议成功举办所作的工作。
我非常荣幸和高兴能够受聘为教授，为万杰的质子治疗提供一些帮助。为了在粒子治疗方面获得预期的成果，制定诊疗规范是非常重要的。在过去的10年时间里，以近50种疾病的诊疗方案为基础，我们治疗了大多数的病人。在不远的将来，我们会举办特定肿瘤领域的会议，例如肝、肺、食道等等领域，我们会在治疗策略和技术方面进行讨论。我和我的同事很高兴能够与你们共同合作。
如果你们有任何的建议，都请告诉我。
辻井博彦（促智）
带电粒子治疗研究中心主任
日本国立放射学研究所主任
日本千叶市千叶县稻毛区
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