Skip to content

Post-ESD carbon-ion radiotherapy

Phase I study of additional carbon-ion radiotherapy following endoscopic submucosal dissention for esophageal squamous cell carcinoma. - ENCORE trial

Status
Recruiting
Phases
Phase 1
Study type
Interventional
Source
JPRN
Registry ID
JPRN-jRCT1032250012
Enrollment
18
Registered
2025-04-22
Start date
2025-12-11
Completion date
Unknown
Last updated
2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Esophageal Cancer Esophageal Cancer

Interventions

Carbon-ion radiotherapy is performed for patients who require additional treatment after ESD for esophageal cancer.

Sponsors

Isozaki Tetsuro
Lead Sponsor

Eligibility

Sex/Gender
All

Inclusion criteria

Inclusion criteria: 1) Persons aged 18 years or older at the time ofobtaining consent. Gender is not a consideration. 2) Patients with histologically diagnosed primary squamous cell carcinoma of the thoracic esophagus after endoscopic submucosal dissection (ESD). 3) Patients with histologically diagnosed pT1a-MM or pT1b in 2) and negative resection margins. 4) Patients who have been determined to have nometastasis of esophageal cancer based on imaging tests using CT and PET before carbon-ion radiotherapy. 5) Patients who have no active ulcers in the esophagus before carbon-ion radiotherapy, and whose ulcers have healed and scarred after ESD. 6) Patients who are not indicated for or do not wish to undergo additional surgical resection or X-ray-based chemoradiotherapy for esophageal cancer. 7) Patients with a performance status (ECOG) of 0-2. 8) Those who have no history of prior surgical resection for esophageal disease. 9) Those who are estimated to have a life expectancy of more than 6 months. 10) Those who have obtained written consent from the patient regarding participation in this clinical study. 11) Cases in which consent was obtained for this study within 70 days of the completion of ESD.

Exclusion criteria

Exclusion criteria: 1) Those whose ulcer surface has become full-circumferential due to ESD. 2) Those who have had local steroid injections into the ulcer after ESD. 3) Those who have active and intractable infection in the irradiated area. 4) Those who have a history of radiation therapy in the irradiated area. 5) Those who are judged to be unable to participate in this study for medical or psychological reasons. 6) Those who are pregnant or may be pregnant, or who are breastfeeding. 7) Other people who the principal investigator or other staff members judge to be unsuitable as subjects for this clinical research.

Design outcomes

Primary

MeasureTime frame
Adverse events of Grade 3 or higher within 90 days of carbon-ion radiotherapy

Secondary

MeasureTime frame
All adverse events within 180 days of carbon-ion radiotherapy, recurrence-free survival, overall survival

Contacts

Public ContactTetsuro Isozaki

National Institutes for Quantum Science and Technology

isozaki.tetsuro@qst.go.jp+81-43-206-3306

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026