Safety of Fluvastatin-Celebrex Association in Low-grade and High Grade Optico-chiasmatic Gliomas

Optico-chiasmatic gliomas have therapeutic feature since surgical resection plays a secondary role. Unlike other sites, many of these tumors are not amenable to complete resection either because of anatomical location, and sometimes they only can be biopsied. A substantial number of children will have recurrences following resection or will experience progression following incomplete tumor removal or biopsy.

Celebrex is a Cox-2 inhibitor with anti-angiogenic and anti-tumor properties, while statins are known to increase the sensitivity of gliomas to anti-tumor agents. Their association could be administered for long periods, in the hope of much reduced risk of toxicities.

This is a national, multicentric, interventional, open-label, non-comparative, and non-randomized phase I study evaluating the maximum tolerated dose of the Fluvastatin in combination with fixed-dose of Celebrex.

This project involves 10 SFCE health centers accustomed to phase I / II studies(Société Française de Lutte contre les Cancers et Leucémies de l'Enfant et de l'Adolescent - French Society for the Fight against Cancer and Leukemia in Children and Adolescents).

Dose escalation scheme only concerns Fluvastatin, and is based on a CRML model (Continual Reassessment Method Lilelihood approach). Dose associated with a probability of DLT closest to 25% will be considered as Recommended Phase 2 Dose (RP2D).

Escalation phase :

Patients will be included by cohort of 2. First patient will be included at the first dose level of Fluvastatin (2mg/kg/day). The second patient will be included only after sufficient time to assess the absence of DLT on first patient. In absence of DLT during the first 28-day cycle, dose escalation will be allowed (4, then 6 and 8 mg/kg/day of Fluvastatin).

The second and all subsequent patients will be treated at the dose level which DLT probability is closest to 25%, without skipping step. Intra-patient dose escalation is not allowed. Treatment will be administered until progression, or unacceptable toxicity for one year. A minimum of 21 patients will be included during the 1st step, including a minimum of 6 patients receiving RP2D.

Expansion phase :

At RP2D, the number of subjects will be increased to reach a total of 14 evaluable patients, in order to better characterize RP2D safety. Patients will be included in the expansion phase according CRML model as well, to confirm the recommended dose.

Probabilities of DLT associated with each dose level will be re-estimated by CRML progressively, without the need to suspend inclusions. Results could modify RP2D retained during 1st step (dose reduction or a dose re-escalation).

Eligibility Criteria:
Inclusion Criteria:

* Histologically confirmed recurrent or progressive primary hypothalamic-chiasmatic low grade glioma, and not warranting a biopsy or surgery
* Histologically confirmed recurrent or progressive primary hypothalamic-chiasmatic high grade glioma, or in complete remission after a new exeresis, excepted brainstem gliomas
* Relapsed or refractory disease after at least 1 line adjuvant treatment including radiation therapy, but not surgery
* Measurable lesions according to RANO criteria for the patients with low grade glioma and for the patients with high grade glioma included in RP2D level (Recommended Phase 2 Dose).
* Non-measurable lesions according to RANO criteria for patients with high grade glioma included in the dose escalation step.
* Age \> 6 years and \< 21 years old
* Lansky score \> 70 or WHO score \< 2 (neurological conditions associated with the disease should not be taken into consideration)
* Haematological conditions: ANC \> 1000/mm3 and platelets \> 75000/mm3
* Creatinine \< 1.5 x normal for age or calculated clearance \> 70 ml/mn/1.73m2
* Hepatic function: Total bilirubin \< 3 N and SGOT and SGPT \< 4 N
* Muscle enzymes : CPK \< 2 N
* No organ toxicity superior to grade 2 according to NCI-CTCAE v4.0
* No allergy, hypersensibility to one of the compounds of the treatment
* Patients able to swallow capsules
* Life expectancy at least \> 6 months for low grade gliomas and \> 3 months for high grade gliomas
* Patient affiliated with a health insurance system
* Effective contraception for patients (male and female) with reproductive potential throughout the treatment period
* Written informed consent of patient and/or parents/guardians prior to the study participation

Exclusion Criteria:

* Chemotherapy within 21 days before D1 of experimental treatment. This period may be shortened in case of previous chemotherapy with vincristine (2 weeks), or extended in case of targeted therapies (4 weeks), or treatment by nitrosoureas (6 weeks)
* Radiotherapy within 6 months before D1 of experimental treatment
* Peptic ulcer disease, or gastrointestinal bleeding
* Known hypersensitivity to sulfonamides.
* History of asthma, acute rhinitis, nasal polyps, angioedema, urticaria or other allergic-type reactions induced by acetylsalicylic acid or NSAIDs , including COX-2 inhibitors (cyclo-oxygenase- 2)
* Inflammatory bowel disease.
* Known congestive heart failure (NYHA II- IV)
* Ischemic proven, peripheral and/or history of arterial stroke (including transient ischemic attack)
* Pregnancy or breast feeding woman
* Known allergy to experimental treatment
* Organ toxicity superior to grade 2 according to NCI-CTCAE v4.0
* Active infection
* Pre-existing muscle pathology
* Unsuitable for medical follow-up (geographic, social or mental reasons)