NCT07079098

Trial of Oligometastasis SBRT With Immediate, Simulation-Free Treatment Delivery (OLIGO-SWIFT)

Pilot/Phase I Trial of Oligometastasis SBRT With Immediate, Simulation-Free Treatment Delivery (OLIGO-SWIFT)

• Status: Recruiting
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 15 (estimated)
• Sponsor: Case Comprehensive Cancer Center · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

This study is for participants whose cancer is oligometastatic, meaning it has spread to up to five spots in their body and their doctor recommends that they have stereotactic body radiation therapy (SBRT) to treat these cancer sites. SBRT is a type of radiation therapy that may help people with oligometastatic disease live longer without cancer progression. SBRT is usually given in addition to other cancer treatments, like chemotherapy, immunotherapy, or hormone therapy. Preparing for SBRT can take up to a week or longer. This can make it harder for participants to receive SBRT and coordinate care. This can also mean a longer time until symptoms from cancer sites improve. Doctors would like to treat oligometastatic cancers more quickly by reducing the time it takes to plan for the SBRT. The typical workflow for SBRT includes doctors doing a simulation which requires a CT (Computerized Tomography) scan. The CT scan is used to create a treatment plan. It can take time to schedule this CT scan and then it normally takes another 5-10 days to create a treatment plan. A way to reduce the planning time for SBRT is to use the CT scan (or other radiology scan types, like magnetic resonance imaging \[MRI\] or positron emission tomography \[PET\]) that participants had when their cancer was diagnosed to plan their SBRT. This eliminates the scheduling of an additional CT scan and the 5-10 day planning time. This is called CTsim-free (CT simulation-free) treatment planning. CT-sim-free radiation therapy planning has been shown to be effective in treating cancers that are causing pain in people with more advanced or widespread cancers. This study is being done to find out if it is safe and effective to use CTsim-free planning for SBRT to treat oligometastases.

Detailed description

Oligometastatic disease (OMD) is a clinical evolution of cancer in which it has spread beyond the primary site but is not yet broadly metastatic. Oligometastases in radiation oncology are typically defined as being 1 to 5 metastatic lesions that can be safely treated with or without a controlled primary tumor. While multiple factors, including individual's overall health, tumor characteristics and treatment goals, play a crucial role in determining the most appropriate multidisciplinary approach to treating OMD, stereotactic body radiation therapy (SBRT) remains a cornerstone in the standard of care for local OMD therapy and data from multiple clinical trials conducted over several years proved its efficacy in the treatment of oligometastases. However, traditional SBRT plan generation is a time-consuming process that involves thorough effort. A plan can take up to 5 to 10 working days to be generated in addition to CT-simulation as well as multiple clinical and treatment visits. As the time factor is essential in radiation oncology (RO), extended time to delivery can be a strain for people with OMD. This is particularly challenging in OMD due to the multiple disease sites for treatment (up to 5 in a course) as well as the need to coordinate care with ongoing systemic therapy, which often requires safety washout windows around SBRT, but for which prolonged treatment gaps are often undesirable for systemic control. In an attempt to expedite the time-consuming and lengthy overall treatment time, as well as the potential benefit for people with OMD to receive quick treatment a better optimized workflow is needed. A proposed solution for expedited SBRT for OMD is the use of simulation-free radiation treatment planning, in which pre-existing diagnostic images are used to generate a radiation treatment pre-plan (as opposed to acquiring planning-specific image sets). This can be implemented using with online adaptive radiotherapy (ART) to refine and finalize the treatment plan at the time of first-fraction delivery, rather than using a standard simulation process. To account for inconsistencies between diagnostic CT and treatment sessions, automated treatment planning is critical for providing rapid online adaptive radiation therapy with full re-optimization based on the anatomy of the day. This can speed up the process of treatment delivery and optimize on-table dose computation. ART has been proven as clinically feasible and time-efficient in prospective clinical trials treating other anatomical sites. Similarly, simulation-free treatment is an emerging standard of care for urgent, palliative radiotherapy settings. However, to date, the feasibility of simulation-free SBRT using an online ART workflow for oligometastases has not been prospectively tested. Therefore, the purpose of this study is to demonstrate the feasibility of a simulation-free workflow for oligometastases SBRT using online ART. 15 participants will be enrolled; 5 participants with treatment sites in the thorax, 5 with treatment sites in the abdomen/pelvis, and 5 with treatment sites in non-spine bone.

Conditions

• Oligometastasis
• Oligometastatic Disease

Interventions

Type	Name	Description
OTHER	Simulation-free workflow	Pre-existing diagnostic images (CTs, PET/CTs, or MRIs) will be imported into the online treatment planning system called Ethos. The Ethos platform and online adaptive radiation therapy (ART) will be utilized at the time of treatment planning and the first (of five) fractions. Subsequent fractions will be delivered using standard image-guided radiotherapy (IGRT) or ART; this will be decided by the treating physician and institutional guidelines.
RADIATION	SBRT	Participants will receive SBRT per standard of care in up to five fractions. Fractions will be delivered once daily or once every other day over a total period of one to two weeks.

Timeline

• Start date: 2026-02-27
• Primary completion: 2027-02-01
• Completion: 2027-02-01
• First posted: 2025-07-22
• Last updated: 2026-03-03

Locations

1 site across 1 country: United States