Metronomic Treatment in Children and Adolescents With Recurrent or Progressive High Risk Neuroblastoma

Neuroblastoma relapses during or after intensive therapy most likely result from the presence of primary or acquired drug resistance. Therefore, new therapeutic modalities for salvage therapies are urgently needed.

The historical Kaplan-Meier curves of 218 unselected high risk patients after the first recurrence (from CR) or after the first progression (from PR/SD) demonstrate a 1 year event free survival rate of 25.2 ± 2.9% and a 1 year overall survival rate of 42.7 ± 3.3%.

Today cancer is widely considered as a multicomponent disease. One novel strategy likely to target the complexity of tumor cells and tumor environment is metronomic scheduling of anticancer treatment or "metronomic treatment" (MT). Low doses of chemotherapeutic drugs are continuously administered to cancer patients. The higher frequency and lower dose targets distinct aspects of cancer's functionality. Effects on tumor-angiogenesis, anti-cancer immunity and tumor stroma have been shown. Additionally low-dose metronomic treatment is often combined with modern antiinflammatory or antiangiogenic drugs, which specifically interact e.g. in tumor growth or angiogenesis pathways.

The rationale of this trial is the efficacy of metronomic therapy in heavily pre-treated refractory neuroblastoma patients.This trial protocol proposes a metronomic schedule of low dose chemotherapy with cyclophosphamide, etoposide and vinblastine, in combination with propranolol, a non-selective blocker of β adrenergic receptors and celecoxib, a selective cyclooxygenase type 2 (COX-2) inhibitor.

Patients enrolled in this study may benefit for two reasons. In the palliative situation, metronomic treatment may result in disease stabilization (SD) and a significant improvement of the quality of life (QOL) of patients e.g. by the decrease of pain through the treatment. For this reason, QOL including pain module is assessed as a separate secondary objective/ outcome measure. In the case of tumor response (PR, CR), the patients may qualify for a subsequent treatment approach aiming at further disease stabilization or even a long-term benefit.

Inclusion criteria

• Newly diagnosed recurrence or progression of high risk neuroblastoma which progressed despite previous treatment (irrespective of the number of previous relapses/progressions).
• Refractory and/or residual high-risk neuroblastoma with measurable or evaluable disease irrespective of preceding treatment (no Progression during the minimal interval as defined below)
• Age: ≥ 2 years and < 21 years
• Measurable or evaluable disease defined as

• Presence of at least one measurable (recurrent or newly progressing) neuroblastoma lesion ≥ 10 mm by magnetic resonance imaging (MRI) or computed tomography (CT) or
• Newly detected unambiguous scintigraphic (MIBG) avid bone and/or medullary lesions
• presence of unambiguous bone marrow metastasis
• Minimal interval between start of trial medication and preceding anti-cancer treatment is 4 weeks after chemotherapy, 6 weeks after radiotherapy, and 12 weeks after myeloablative therapy
• Life expectancy > 3 months
• Good to moderate general condition (performance scale ≥60)
• No serious infection
• Spontaneous recovering blood counts:

• White blood cell count ≥ 1000/µL
• Neutrophil count ≥ 500/µL
• Platelet count ≥ 25 000/µL (unsupported)
• Written informed consent of parents or legal guardian and/ or patient according to age and status of psycho-intellectual development.

Exclusion criteria

• Minimal residual disease status (only) without unambiguous measurable or evaluable disease
• Patients unable to swallow trial medication
• Any concomitant anti-cancer treatment (e.g. other cytostatic drugs, "small molecules", antibodies, radiotherapy, surgery of tumor or metastases)
• Treatment with medication that interact with study medication that cannot be discontinued at least one week prior to the start of trial medication and for the duration of the trial
• Intake of antihypertensive drugs, e.g. calcium channel blockers
• Established hypersensitivity to the active or one of the other constituents of the trial medication
• Severe medical or psychosocial conditions preventing trial participate and/or any of the following

• Peripheral neuropathy or constipation CTCAE grade 3 or 4
• Cardiac arrhythmias (sinus bradycardia for age, sinus arrhythmia as 2.-3. grade atrioventricular block)
• Pre-existing recurrent symptomatic bronchial asthma
• Diabetes mellitus (propranolol covers symptoms of hypoglycemia)
• Conditions with low blood pressure below age-dependent normal ranges
• History of gastrointestinal ulcer or perforation
• Known active hepatitis B virus (HBV), hepatitis C (HBC) virus or human immunodeficiency virus (HIV) infection
• Concomitant participation in other clinical trials with investigational drugs or with competing interventions
• Pregnancy, lactation
• Sexually active patients not willing to use highly effective contraception