Treatment Results

【Carbon-ion Radiotherapy】Number of patients by cancer type

Cancer	FY2020 (Feb. - Mar. 2021)	FY2021	FY2022	FY2023	FY2024	FY2025	Total
Head and neck tumors			13	24	18	22	77
Esophageal cancer						5	5
Lung cancer			10	8	27	22	67
Liver cancer			36	80	83	75	274
Pancreatic cancer			18	47	35	58	158
Kidney cancer			3	5	6		14
Postoperative recurrence of colorectal cancer			9	14	12	11	46
Gynecologic cancer			2	4	9	7	22
Prostate cancer	12	353	422	455	465	496	2203
Bone and soft tissue tumors			8	21	26	26	81
Metastatic lymph nodes			3	4	3	1	11
Total	12	353	524	662	684	723	2958

【Carbon-ion Radiotherapy】Number of patients by prefecture and country

prefecture and country	FY2020 (Feb. - Mar. 2021)	FY2021	FY2022	FY2023	FY2024	FY2025	Total
Yamagata	12	281	416	470	463	499	2141
Miyagi		46	44	83	86	91	350
Akita		3	17	25	47	42	134
Iwate		6	22	28	26	42	124
Aomori		2	12	18	30	15	77
Fukushima		8	9	23	18	17	75
Niigata		4	2	6	7	8	27
Hokkaido		2		2	2	1	7
Saitama			1	2			3
Tokyo				1		1	2
Shiga					2		2
Tochigi						2	2
Kanagawa		1					1
Ibaraki				1			1
Chiba					1		1
Toyama						1	1
Aichi						1	1
Lithuania			1				1
South Korea				3	2	3	8
Total	12	353	524	662	684	723	2958

【Carbon-ion Radiotherapy】Treatment History

February 2021	Started treatment for prostate cancer.
May 2022	Started treatment for head and neck tumors.
July 2022	Started treatment for postoperative recurrence of colorectal cancer and bone and soft tissue tumors (pelvic region).
October 2022	Yamagata University Faculty of Medicine East Japan Heavy Ion Center begins full-scale operation.