The Clinical Relevance of Margins in Frameless Stereotactic Radiosurgery for Intact Brain Metastases: a Randomized Trial of 0 vs 2 mm Margins
This is a randomized study to determine if not treating planning target volume (PTV) margins during radiation therapy worsens progression free survival rates in patients with brain metastases.
18 Years and up
Accepting Healthy Volunteers?
- Adult patients (≥ 18 years old) with an ECOG Performance Status 0-2 and a life expectancy of 3 months or more.
- Histologically confirmed systemic malignancy with gadolinium contrast-enhanced MRI scan demonstrating 1-5 intraparenchymal brain metastases.
- Well-circumscribed, measureable intraparenchymal brain lesion(s) with maximum tumor diameter ≤3.0 cm. If multiple lesions are present, the other(s) must not exceed 3.0 cm in maximum diameter. At least one lesion must be ≥1.0 cm in maximum diameter and ≥0.5 cm in a perpendicular diameter to be considered measurable disease.
- Negative urine or serum pregnancy test done ≤ 14 days prior to CT simulation, for women of child-bearing potential only.
- Ability to understand and willingness to sign a written informed consent document.
- Diagnosis of germ cell tumor, small cell carcinoma or hematologic malignancy.
- Metastases in the brain stem, midbrain, pons, medulla, or within 7 mm of the optic apparatus (optic nerves, chiasm and optic tracts).
- Diagnosis of leptomeningeal disease.
- Prior cranial radiotherapy within 90 days of trial enrollment or prior SRS at any time to any lesion to be treated on protocol
- Chemotherapy (including oral agents and targeted agents) or immunotherapy given within 14 days of SRS. Hormonal therapy is permitted. For Her2+ breast cancer patients, anti-Her2 therapy cannot be given within 14 days of SRS. Patients who are scheduled to receive trastuzumab emtansine after SRS cannot be enrolled.
- Contraindications to gadolinium contrast-enhanced MRI (eg, non-compatible pacemaker, eGFR<30, gadolinium allergy).