Carbon-Ion Radiotherapy ‘Very Effective’ in Unresectable CRC

Carbon-Ion Radiotherapy ‘Very Effective’ in Unresectable CRC

The examine coated on this abstract was printed on as a preprint and has not but been peer reviewed.

Key Takeaway

Carbon-ion radiotherapy is a promising therapy for unresectable, domestically recurrent colorectal most cancers (CRC), together with for sufferers who’ve undergone radiotherapy earlier than.

Why This Issues

Carbon-ion radiotherapy is stronger and extra targeted than typical radiotherapy however is usually not provided in america.

The long-term prognosis for sufferers with unresectable, domestically recurrent CRC with typical chemotherapy or chemoradiotherapy is poor; earlier research have reported 3-year general survival of 4% to 24% for sufferers who bear chemoradiotherapy or x-ray remedy.

From the present findings, investigators concluded that carbon-ion radiotherapy for domestically recurrent CRC “is a really efficient and promising therapy” different and is “probably healing.”

Carbon-ion radiotherapy is roofed by nationwide medical insurance in Japan and is predicted to be launched in varied international locations, together with america, quickly.

Research Design

The workforce reviewed carbon-ion radiotherapy outcomes for 473 sufferers with unresectable, domestically recurrent CRC who underwent therapy from 2003–2019, together with 83 who had beforehand undergone x-ray or proton-beam radiotherapy.

Carbon-ion radiotherapy was administered Four days per week for 16 fractions.

The overall dose was 73.6 Gy for radiotherapy-naive sufferers and 70.Four Gy for sufferers who had beforehand undergone radiotherapy.

Concurrent chemotherapy was not used.

Exclusion standards included recurrence on the anastomotic web site and invasion of the intestines or bladder.

Surgical procedures, together with placement of spacers and diversion colostomies, have been utilized in some instances to cut back the chance of intestinal injury.

The median follow-up was Four years.

Key Outcomes

Three-year general survival was 73% for radiotherapy-naive sufferers and 76% for sufferers who had beforehand undergone radiotherapy; for each teams, 3-year native management was achieved for 80% of sufferers.

5-year general survival was 50% in each teams; 5-year native management was achieved in 72% of the radiotherapy-naive group and in 69% of sufferers who had previosly undergone radiotherapy.

A historical past of resection of distant metastases didn’t have an effect on prognosis.

The speed of opposed occasions of grade Three or larger was higher among the many sufferers who had beforehand undergone radiotherapy than among the many radiotherapy-naive group. Early toxicities occurred in 7.2% of the sufferers who had previosly undergone radiotherapy; late occasions occurred in 26.5% of those sufferers. Amongst radiotherapy-naive sufferers, the charges have been 1% and 5.9%, respectively.

However opposed occasion charges among the many sufferers who had beforehand undergone radiotherapy have been the identical as noticed with x-ray therapy and surgical resection.


It was a single-center, retrospective examine.

Regionally recurrent CRC analysis was not all the time confirmed by pathology.

Lengthy-term outcomes weren’t achieved by carbon-ion radiotherapy alone however by the absolute best therapy for the affected person, which might have included chemotherapy after therapy.


It is a abstract of a preprint analysis examine, “Carbon-Ion Radiotherapy for Unresectable Regionally Recurrent Colorectal Most cancers: A Promising Healing Therapy for Each Radiotherapy-Naive Circumstances and Re–Irradiation Circumstances,” led by Hirotoshi Takiyama of QST Hospital in Chiba, Japan, supplied to you by Medscape. The examine has not been peer reviewed. The complete textual content might be discovered at

M. Alexander Otto is a doctor assistant with a grasp’s diploma in medical science and a journalism diploma from Newhouse. He’s an award-winning medical journalist who has labored for a number of main information shops earlier than becoming a member of Medscape and in addition an MIT Knight Science Journalism fellow. Electronic mail:

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