Observational study of SBRT for patients with rare tumors and oligometastases

Prospective Observational Basket Study of Stereotactic Body Radiation Therapy for OligoMetastatic Patients From Rare Tumors: the PROMPT Study

Istituto Clinico Humanitas · NCT05903261

This study is testing how well a special type of radiation therapy works for patients with rare tumors that have spread to a few other places in the body.

Quick facts

Study typeObservational
Enrollment200 (estimated)
Ages18 Years and up
SexAll
SponsorIstituto Clinico Humanitas (other)
Drugs / interventionsradiation
Locations1 site (Rozzano, Milan)
Trial IDNCT05903261 on ClinicalTrials.gov

What this trial studies

This prospective observational study investigates the effectiveness and safety of stereotactic body radiation therapy (SBRT) in managing oligometastases from rare tumors. It aims to identify differences in treatment efficacy and toxicity across various cancer types, providing valuable insights into SBRT's role in these contexts. The study includes patients with a limited number of metastases and evaluates the potential for improved treatment outcomes through localized radiation therapy. By focusing on rare tumors, this research seeks to enhance treatment options for patients who often face limited choices.

Who should consider this trial

Good fit: Ideal candidates include patients with histologically confirmed rare solid tumors and oligometastases who meet specific eligibility criteria.

Not a fit: Patients who have previously received radiation treatment to the same metastatic site or have contraindications to SBRT may not benefit from this study.

Why it matters

Potential benefit: If successful, this study could offer a promising treatment option for patients with rare tumors and oligometastases, potentially leading to better local control and outcomes.

How similar studies have performed: While there is limited data on SBRT for rare tumors, previous studies have shown promising results for SBRT in common solid tumors, indicating potential for success in this novel application.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* ECOG PS 0 - 2
* histologically confirmed diagnosis of rare solid tumors including melanoma, soft tissue sarcoma, head-neck tumors, gynaecological tumors, Merkel cell carcinoma, thymic carcinoma, gastrointestinal stromal tumors (GIST) and urothelial tumors
* No limit to the number of metastases treated with SBRT but all active lesions must be treated with radical intent (primary tumor and metastases)
* Synchronous and metachronous oligometastases, as well as oligorecurrent and oligoprogressive disease are allowed
* Ablative dose intended as a minimum dose of 50Gy EQD2/10 in a maximum of 10 fractions
* No restrictions to prior or on-going systemic therapies

Exclusion Criteria:

* prior treatment with radiation to the same metastatic site
* inability to provide informed consent
* contraindications to SBRT

Where this trial is running

Rozzano, Milan

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.

View on ClinicalTrials.gov →

Conditions: Oligometastatic Disease

Last reviewed 2026-05-15 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.