FLASH Pilot Phase 1 Safety Study

May 20, 2026 updated by: Lesley A. Jarvis

A Pilot Study to Determine the Feasibility of Electron FLASH Radiotherapy for Treatment of De-novo Cutaneous Lymphoma

The primary purpose of this research trial is to study the safety of electron FLASH treatment for cutaneous lymphoma lesions. In addition, investigators will confirm the accuracy of dose and dose rate delivery of electron FLASH therapy using on-patient dosimetry measurements in combination with FAST camera imaging. Researchers will also determine the response rates of cutaneous lymphomas treated with a low radiation dose in a single fraction using electron UHDR treatments, followed by an assessment of radiation related skin toxicity.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

10

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Histologic proof of cutaneous lymphoma.
  2. The cutaneous lymphoma is not planned to be treated with definitive, higher dose radiotherapy therapy.
  3. Participant is planned to receive a course of palliative radiation therapy at DHMC for a cutaneous lymphomas lesion located on an extremity (see appendix A) that can be encompassed in a field size no larger than 7.5 cm in diameter.
  4. No prior history of radiotherapy to the site of planned treatment.
  5. Patient agrees to discontinue topical therapy, including steroid creams or chemotherapy agents, to the index lesion 4 weeks prior to the radiation treatment.
  6. Participant must be capable of providing informed consent or has an acceptable surrogate capable of providing consent on behalf of the participant.
  7. Adults at least 18 years of age
  8. Eastern Cooperative Oncology Group performance status of <3.
  9. Women of childbearing potential (WOCBP): Premenopausal females who had at least one menstrual cycle in the past 12-months and capable to become pregnant, must have a negative serum beta-HCG pregnancy test result within seven days prior to start of treatment.
  10. WOCBP who are sexually active must agree at study entry to use adequate methods of contraception during treatment.

Exclusion Criteria:

  1. Prior radiotherapy to the site of treatment.
  2. Index lesion UHDR treatment field is <5cm from the field edge of a synchronously treated CONV lesion.
  3. Patient receiving prescribed hormonal therapies.
  4. Patients with known NCI CTCAE V5.0 grade 3 or higher active systemic or cutaneous viral, bacterial, or fungal infection.
  5. Patients with any serious underlying medical condition that would impair their ability to receive or tolerate the planned treatment and/or comply with study protocol.
  6. Patients with dementia or altered mental status that would preclude understanding and rendering of informed consent process.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Device Feasibility
  • Allocation: Non-Randomized
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Experimental arm treated with FLASH Radiation Therapy
In participants with more than one cutaneous lesion requiring treatment, one lesion will be treated with electron FLASH therapy. The prescription dose will be 8 Gray (Gy) in 1 fraction.
Device: IntraOp Mobetron UHDR

The Mobetron UDHR System provides electrons for precision radiotherapy of lesions, tumors, and conditions anywhere in the body where radiation treatment is indicated.

The FLASH enabled Mobetron System is intended to deliver electron FLASH radiotherapy to participants with cutaneous lymphoma lesions located in extremities.
Active Comparator: Control arm treated with Conventional Radiation Therapy
In participants who have more than one cutaneous lesion requiring treatment, the remainder of the lesions not treated with electron FLASH therapy will be treated with conventional electron treatment at the discretion of the treating radiation oncologist.
Radiation: Linac
Conventional radiotherapy

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Safety and toxicity profile characterization of electron FLASH treatment
Time Frame: 5 years
To study the safety and characterize the toxicity profile of electron FLASH treatment, a clinical evaluation of all lesions treated will be performed on all grade 3 or higher toxicities according to the Common Terminology Criteria for Adverse Effects (CTCAE) version 6.0.
5 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Lesley A. Jarvis

Collaborators

Dartmouth College

Investigators

  • Principal Investigator: Lesley A Jarvis, MD, Dartmouth-Hitchcock Medical Center

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

October 31, 2029

Primary Completion (Estimated)

December 31, 2030

Study Completion (Estimated)

December 31, 2031

Study Registration Dates

First Submitted

May 20, 2026

First Submitted That Met QC Criteria

May 20, 2026

First Posted (Actual)

May 27, 2026

Study Record Updates

Last Update Posted (Actual)

May 27, 2026

Last Update Submitted That Met QC Criteria

May 20, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 02003370

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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