Glowing dye could help surgeons spot hidden brain cancer

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Age 18 and older 2. Radiological evidence of a unifocal, contrast-enhancing brain lesion consistent with HGG, characterized by ring-enhancing or heterogeneously enhancing tumor with central hypointensity suggestive of necrosis, based on preoperative contrast-enhanced T1-weighted MRI. 3. Suspected HGG based on imaging, later confirmed as WHO Grade 3 or 4 glioma postsurgery. Eligible histologies (WHO CNS5) upon intraoperative or postoperative confirmation are: * Glioblastoma, IDH-wildtype (CNS WHO Grade 4) * Astrocytoma, IDH-mutant (CNS WHO Grade 3 or 4) * Oligodendroglioma, IDH-mutant, 1p/19q-codeleted (CNS WHO Grade 3) * Ependymoma (CNS WHO Grade 3) 4. No prior tumor-specific treatment, including surgery, chemotherapy, radiotherapy, or investigational therapy (i.e., newly diagnosed, treatment-naïve HGG). 5. Subject is scheduled to undergo first neurosurgical intervention with the intent of GTR of the contrast-enhancing lesion. 6. Surgery must be clinically anticipated to allow GTR, defined as removal of ≥98% of contrast-enhancing tumor, based on neurosurgeon assessment and preoperative imaging. 7. Indication for surgical tumor resection. The anatomical location of the contrast agent-accumulating tumor allows the possibility of complete resection. Resectability and EOR will be retrospectively assessed by an independent blinded centralized review of preoperative and postoperative MRI. 8. KPS ≥70, as assessed within 14 days prior to study treatment. Subject must not previously have received the trial drug (FG001). 9. Male subjects must commit to use barrier contraception (e.g., condom) during the trial and for 30 days after the end-of-trial visit and avoid sperm donation during this period. 10. Women of childbearing potential must agree to use highly effective method of contraception during the trial and for 30 days after the end-of-trial visit. Acceptable methods of contraception include intrauterine device or hormonal contraception (oral contraceptive pill, depot injections or implant, transdermal depot patch or vaginal ring). To be considered sterilized or infertile, females must have undergone surgical sterilization (bilateral tubectomy, hysterectomy or bilateral ovariectomy) or be post-menopausal (defined as at least 12 months amenorrhea; may be confirmed with FSH test if there is doubt). 11. Subject is capable of understanding and giving written informed consent Exclusion Criteria: 1. Tumor location in the midline, basal ganglia, cerebellum, or brainstem where resection is not safely achievable or is considered high-risk. 2. Tumors judged by the PI to infiltrate critical motor pathways. 3. Multifocal disease, defined as: 3a. More than one contrast-enhancing lesion; or 3b. Additional contrast-enhancing lesions unrelated to the primary tumor; or 3c. Evidence of extracerebral metastases 4\. Substantial non-contrast-enhancing tumor areas suggestive of low-grade glioma with malignant transformation, as assessed by preoperative MRI. Defined as ≥50% of non-CE volume in relation to CE tumor volume. 5\. Tumor location is not amenable to GTR based on neuro-surgeon assessment. 6\. Application of iMRI or intraoperative ultrasound guidance during surgical resection is prohibited to avoid bias in resection outcome measurement. 7\. Medical contraindications to MRI (e.g., pacemaker). 8\. Any known allergy or hypersensitivity to: 8a. ICG or any component of the IP 8b. Gadolinium-based contrast agents 9\. Pre-existing severe chronic renal impairment, defined as: 9a. Estimated indexed and non-indexed glomerular filtration rate (eGFR ≤30 mL/min/1.73 m² AND (eGFR ≤30 mL/min) 9b. Assessed within 30 days prior to enrollment 10\. Pre-existing hepatic insufficiency, defined as: 10a. AST and alanine transaminase ALT \>3 times the upper limit of normal; or 10b. Total bilirubin \>1.5 times the upper limit of normal unless the elevation is attributable to Gilbert's syndrome. 10c. Assessed within 30 days prior to enrollment 11\. Abnormal coagulation profile, defined as any: 11a. Platelets \< 100,000 11b. aPTT \>1.5x upper limit of normal, or 11c. INR \> 1.7 11d. Assessed within 30 days prior to enrollment 12\. QTc will be assessed using Fridericia's correction (QTcF); thresholds for exclusion is \> 470 ms or subjects with QTcF \> 470 ms will be excluded. 13\. History of malignant tumor in any body site (excluding adequately treated basal cell carcinoma of the skin). 14\. Unwilling or unable to follow the protocol requirements. 15\. Prior history of serious gastrointestinal perforation, diverticulitis, and/or peptic ulcer disease. 16\. Existing or planned pregnancy or lactation, or unwillingness/inability to use effective contraception during the study. 17\. Inability to provide informed consent due to significant language barrier, cognitive impairment, or dysphasia. 18\. Simultaneous participation in another interventional clinical trial or trial participation in any other clinical study 30 days prior to enrollment. 19\. Subjects enrolled that are later determined to have non-high-grade gliomas will be considered a screen failure (e.g., Excluded Population), including but not limited to: 19a. IDH-mutant oligodendroglioma, or astrocytoma 19b. Metastasis 19c. Lymphoma