Prospective Observational Trial of Image-guided Ablative STereotactic bOdy Radiation Therapy for Primary kidNey Cancer: the STONE Trial

January 19, 2026 updated by: Istituto Clinico Humanitas
The study objective is to evaluate the use of Stereotactic Body Radiotherapy (high dose of radiation in a few fractions) to cure primary renal cancer in those patients that are not indicated to surgery (high risk of complications, refusal of the patient). This therapy is already used in clinical setting for many tumors with good tolerance as it is not invasive, does not require anesthesia and hospitalization making it suitable for elderly people and frail patients. However there are not enough information regarding the use of ablative doses for the cure of renal cancer and for this reason this study aims to support the use of Stereotactic Body Radiotherapy as a standard of care for inoperable primary renal tumor. This is an observational study, so it collects data from clinical pratice only and does not request study specific procedures.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
53

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

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

patient with renal cancer not candidate to surgery

Description

Inclusion Criteria:

  • Age ≥ 18 years
  • ECOG performance status 0 - 2
  • Histologically confirmed diagnosis of primary RCC
  • cT1 stage tumor with single lesion with maximum diameter of 7 cm
  • Medically inoperable or at high risk of complication from surgery, or declined surgery
  • Absence of metastatic disease
  • Written informed consent

Exclusion Criteria:

  • Estimated glomerular filtration rate (eGFR) < 30 mls/min
  • Previous radiotherapy on the same site
  • Previous systemic therapy for RCC
  • Tumor diameter larger than 7 cm
  • Presence of metastatic disease
  • Life expectancy < 3 months

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

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
evaluate LC of treated lesions at 1 year
Time Frame: from end of treatment to 1 year
local progression is defined as an enlargement of at least 20% relative and 5 mm absolute increase of sum of diameters of target lesions compared to baseline at least after 6 months from treatment end
from end of treatment to 1 year

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
to assess acute and late toxicity
Time Frame: from start of treatment to 3 years
evaluate the presence of toxicities to treatment according to CTCAE 4.03
from start of treatment to 3 years
Progression Free Survival (PFS)
Time Frame: from end of treatment to 1 year
to asses through standard imaging according to clinical practice - The length of time during and after the treatment of cancer that a patient lives with the disease but it does not get worse
from end of treatment to 1 year
metastasis free survival
Time Frame: from end of treatment to 3 years
to asses through standard imaging according to clinical practice - The length of time from the start of treatment for cancer that a patient is still alive and the cancer has not spread to other parts of the body
from end of treatment to 3 years
Overall Survival
Time Frame: from end of treatment to 3 years
to asses through standard imaging according to clinical practice - The length of time from the start of cancer treatment during which patients diagnosed with the disease are still alive.
from end of treatment to 3 years
To assess kidney function with serum creatinine
Time Frame: from start of treatment to 3 years
evaluating serum creatinine at each follow up visit through blood analysis (mg/dL)
from start of treatment to 3 years
To asses Quality of Life
Time Frame: from start of treatment to 3 years
Through QLQ-C30 questionnarie we will evaluate quality of life, patient will answer different questions crossing the number that is more suitable regarding their condition (the patient can respond by crossing a number from 1 to 4, 1 = excellent quality of life, 4 = terrible quality of life)
from start of treatment to 3 years
To assess kidney function with estimated glomerular filtration rate
Time Frame: from start of treatment to 3 years
evaluating eGFR at each follow up visit through blood analysis (ml/min)
from start of treatment to 3 years

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Istituto Clinico Humanitas

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

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)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 1, 2033

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
December 10, 2025

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 10, 2025

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 23, 2025

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
January 21, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
January 19, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
January 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • STONE TRIAL

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

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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