Sonocloud-9 in Association With Carboplatin Versus Standard-of-Care Chemotherapies (CCNU or TMZ) in Recurrent GBM

Inclusion Criteria:

1. Histologically proven glioblastoma (WHO criteria 2021), absence of IDH mutation demonstrated by negative IDH1 R132H staining on Immunohistochemistry.

2. Patient must have received prior first line therapy that must have contained both:

3. Prior surgery or biopsy and standard fractionated radiotherapy (1.8-2 Gy/fraction, >56 Gy<66 Gy) or hypofractionated radiotherapy (15 x 2.66 Gy or similar regimen)

4. One line of maintenance chemotherapy and/or immune- or biological therapy, (with or without Tumor-Treating Fields)

5. First, unequivocal disease progression with

6. measurable tumor (>100 mm2 or 1 cm3, based on RANO criteria) documented (e.g., increase of 25% in tumor diameter) on MRI performed within 14 days of inclusion and,

7. interval of a minimum of 12 weeks since the completion of prior radiotherapy, unless there is a new lesion outside the radiation field or unequivocal evidence of viable tumor on histopathological sampling

8. Patient is candidate for craniotomy and at least 50% resection of enhancing region

9. Maximal enhancing tumor diameter prior to inclusion ≤ 5 cm on T1w. (In case of planned lobectomy, post operative peritumoral brain or residual size ≤5 cm)

10. WHO performance status ≤ 2 (equivalent to Karnofsky Performance Status (KPS) ≥ 70)

11. Age ≥ 18 years

12. Participant must be recovered from acute toxic effects (<grade 2) of all prior anticancer therapy. Interval since last therapy to presumed date of surgery of at least:

13. ≥ 4 weeks or 5 half-lives (whichever is shorter) for

• Cytotoxic

• Other small chemical entity (e.g., targeted therapy)

• For biologics (e.g., antibodies, except bevacizumab)

2. ≥ 6 weeks of prior bevacizumab

3. Adequate hematologic, hepatic, and renal laboratory values within 14 days of inclusion i.e.:

4. Hemoglobin ≥ 10 g/dL, platelets ≥ 100,000/mm3, neutrophils ≥ 1500/mm3.

5. Liver function test with ≤ grade 1 alterations, except if due to antiepileptic drug therapy or isolated increased bilirubin due to Gilbert syndrome

6. Estimated glomerular filtration rate (eGFR) of at least 60 mL/min/1.73 m2 using Cockcroft Gault formula

7. Patient able to understand clinical trial information and willing to provide signed and informed consent

8. Patient of childbearing potential must have a negative pregnancy test within 14 days of inclusion and must agree to use a medically-acceptable method of birth control during the treatment period and, if randomized in the experimental arm, for at least 1 month after the last cycle of carboplatin

9. A male patient must agree to use condoms during the treatment period and, if randomized in the experimental arm, for at least 3 months after the last cycle of carboplatin; the patient must also refrain from donating sperm during this period.

10. Patient must be a beneficiary of a health plan that covers routine patient care costs. Patient must be a beneficiary of or affiliated with a social security scheme (according to country-specific requirements)

Non-Inclusion Criteria:

1. Multifocal enhancing tumor on T1w (unless all localized in a 5 cm diameter area)

2. Posterior fossa tumor

3. Known BRAF/ NTKR mutated patients

4. Patient at risk of surgery site infection (e.g., 2 or more previous craniotomies/neurosurgery within the last 3 months, poor skin condition, and/or previously infected surgical field, or any other condition that is of increased infectious risk in the opinion of the neurosurgeon)

5. Patient treated at high, stable -or average- dose of corticosteroids (≥ 6 mg/day dexamethasone or equivalent) in the 7 days prior to inclusion. Patients on dexamethasone for reasons other than mass effect may still be enrolled.

6. Contra-indication to carboplatin, CCNU or TMZ

7. Known history of hypersensitivity reactions to perflutren lipid microsphere components or to any of the inactive ingredients in ultrasound resonator

8. Patient has received bevacizumab for other reasons (such as tumor progression) than treating edema

9. Peripheral neuropathy or neuropathy ≥ grade 2

10. Uncontrolled epilepsy or evidence of intracranial pressure

11. Patient with known intracranial aneurism or having presented intra-tumor significant spontaneous hemorrhage

12. Patient with unremovable coils, clips, shunts, intravascular stents, and/or wafer, or reservoirs

13. Patient with medical need to be on continued anti-platelet aggregation therapy and/or anticoagulation. Patients for whom anticoagulation/platelet aggregation can be temporarily interrupted may be eligible after discussion and prior authorization by the sponsor.

14. Patient receiving enzyme-inducing antiepileptic drugs (namely phenytoin, carbamazepine and derivatives, phenobarbital), unless switched on another antiepileptic regimen

15. History of other malignancy within 3 years prior to study start with the exception of adequately treated basal cell carcinoma, squamous cell carcinoma, non-melanomatous skin cancer or carcinoma in situ of the uterine cervix

16. Patient with known or suspected active or chronic infections

17. Patient with known significant cardiac disease, known to have right-to-left shunts, severe pulmonary hypertension (pulmonary artery pressure > 90 mm Hg), uncontrolled systemic hypertension, or acute respiratory distress syndrome

18. Known sensitivity/allergy to gadolinium, or other intravascular contrast agents

19. Patient with impaired thermo-regulation or temperature sensation

20. Pregnant, or breastfeeding patient

21. Any other serious patient medical or psychological condition that may interfere with adequate and safe delivery of treatment and care (e.g., positive human immunodeficiency virus [HIV] status, potential blood-borne infections,...), circumstance (e.g., sinus opening during surgery), psychological, morphological characteristics (e.g., skin characteristics, bone thickness), or any pre-existing comorbidities that in the investigator's opinion may prevent the implantation of the device, may impair the ability of the patient to receive treatment with SonoCloud-9 or may be confounding for evaluation of the clinical trial endpoints

22. Patients under guardianship, curatorship, under legal protection or deprived of liberty by an administrative or judicial decision

Exclusion Criterion:

Occurrence of any major medical illnesses or impairments that in the Investigator's opinion may hampered the ability of the patient to receive treatment with SonoCloud-9 or may be confounding for evaluation of the clinical endpoints.