Masashi Mizumoto

Association of Chronological Age and Comorbidity Burden with Outcomes After Proton Beam Therapy for Hepatocellular Carcinoma

Haruka Shirataki, Masashi Mizumoto, Takashi Iizumi, Takashi Saito et autres

Background/Objectives: The prognostic relevance of chronological age versus comorbidity burden in patients with hepatocellular carcinoma (HCC) undergoing proton beam therapy (PBT) is unclear. This study evaluated whether comorbidity burden provides prognostic information beyond age. Methods: We retrospectively analyzed 269 patients with HCC …

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Gastrointestinal Bleeding During Proton Beam Therapy Following Multimodal High‐Dose Chemotherapy and Anti‐GD2 Immunotherapy in a Child With High‐Risk Neuroblastoma

Airu Okada, Hiroko Fukushima, Kumie Nagatomo, Masako Inaba et autres

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HYDROGEL SPACER OVERCOMES DOSIMETRIC CHALLENGES IN PROTON THERAPY FOR PROSTATE CANCER PATIENTS WITH HIP PROSTHESES

Masahiko Harada, Takashi Iizumi, Haruka Shirataki, Den Fujioka et autres

EP046 / #450SYMPTOM TRAJECTORY AND DISCORDANCE BETWEEN CLINICIAN-GRADING AND PATIENT-REPORTING IN HYPOFRACTIONATED PROTON THERAPY: THE IMPACT OF FRAILTY

Keiichiro Baba, Takashi Iizumi, Taisuke Sumiya, Masaaki Goto et autres

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CEILING EFFECTS AND LACK OF RESPONSIVENESS OF EQ-5D-5L IN ASSESSING ACUTE TOXICITY OF HYPOFRACTIONATED PROTON BEAM THERAPY

Takashi Iizumi, Takuya Sawada, Taisuke Sumiya, Hikaru Niitsu et autres

LONG-TERM OUTCOMES AND LATE TOXICITIES OF PROTON BEAM THERAPY FOR THYMOMA AND THYMIC CARCINOMA: A SINGLE-INSTITUTION EXPERIENCE

Masatoshi Nakamura, Toshiki Ishida, Haruka Shirataki, Den Fujioka et autres

CLINICAL OUTCOMES AND FAILURE PATTERNS IN PEDIATRIC PATIENTS WITH EWING SARCOMA TREATED WITH PROTON BEAM THERAPY

Masaaki Shinoda, Takeshi Fujisawa, Ren Iijima, Yuika Suzuki et autres

Background and Aims: External auditory canal (EAC) and middle ear carcinomas are rare malignancies with poor prognoses in advanced stages, where surgery or chemoradiotherapy yields suboptimal control and morbidity.Carbon-ion radiotherapy (CIRT), which has superior dose distribution and higher relative biological effectiveness, has …

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SAFETY AND PRELIMINARY RADIOGRAPHIC FINDINGS OF BORON NEUTRON CAPTURE THERAPY IN A PHASE I TRIAL FOR NEWLY DIAGNOSED GLIOBLASTOMA

Kei Nakai, Hiroaki Kumada, Yoshitaka Matsumoto, Masahiko Harada et autres

Prognostic Impact of Arterial Phase Hyperenhancement After Proton Beam Therapy for Untreated Solitary Hepatocellular Carcinoma

Hikaru Niitsu, Masashi Mizumoto, Yinuo Li, Masahiko Harada et autres

PURPOSE: To evaluate the significance of persistent arterial-phase hyperenhancement (APHE) on contrast-enhanced CT/MRI at 6 and 12 months after proton beam therapy (PBT) for hepatocellular carcinoma (HCC). METHODS: We retrospectively analyzed 108 patients with solitary HCC without vascular invasion who underwent definitive …

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Clinical Characteristics and Treatment Courses of Exceptional Long-Term Survivors After Multimodal Therapy Including Proton Beam Therapy for Borderline Resectable and Locally Advanced Pancreatic Cancer: A Retrospective Case Series

Haruko Numajiri, Masashi Mizumoto, Osamu Shimomura, Yuya Hagiwara et autres

East Asian multi-centre study on clinical long-term outcomes of postoperative proton beam therapy for localised paediatric intracranial ependymoma

Akifumi Kajihara, Yusuke Demizu, Takashi Saito, Yusuke Azami et autres

Background: Postoperative proton beam therapy (PBT) has shown potential benefits for paediatric intracranial ependymoma; however, further evidence is needed. This study evaluated survival outcomes and toxicity in an East Asian multi-centre cohort. Materials and methods: We retrospectively analysed patients aged <20 years …

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Radiotherapy Strategies for WHO Grade 1 Meningioma: A Systematic Review and Meta-Analysis Comparing Proton Therapy, Conventional Radiotherapy, and Radiosurgery

Hazuki Nitta, Masashi Mizumoto, Kazushi Maruo, Yoshiko Oshiro et autres

BACKGROUND/OBJECTIVES: The optimal radiotherapy modality for World Health Organization (WHO) Grade 1 meningioma remains uncertain. Proton therapy offers dosimetric advantages through reduced radiation exposure to normal brain tissue, but comparative clinical data across contemporary radiotherapy modalities are limited. We performed a systematic …

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