Fenretinide Lym-X-Sorb + Ketoconazole + Vincristine for Recurrent or Resistant Neuroblastoma

Fenretinide has been given by mouth as a capsule to many people, including children. When
Fenretinide is given in capsules, very little of the drug is absorbed through the intestines
into the body. This means patients have to take many capsules of fenretinide by mouth
several times a day. In this study, a new oral preparation of fenretinide (called 4-HPR/LXS
oral powder) is being tested to see if more fenretinide can be absorbed into the body.
4-HPR/LXS oral powder has been tested previously in a limited number of both children and
adult cancer patients.

Ketoconazole, commonly used to treat fungus infections, can increase fenretinide levels in
the body by interfering with the body's ability to break down fenretinide. Ketoconazole will
be given at the same time as the fenretinide powder.

There is preclinical data that shows that combining fenretinide and vincristine prolonged
survival in animal models, therefore, it is hoped that giving the vincristine with
fenretinide will work better against the neuroblastoma that either drug given alone.

About 70 children with neuroblastoma have been treated with various versions of the
fenretinide powder to date, including about a dozen children that also took the fenretinide
powder with ketoconazole, and no toxicities have occurred that limited the dosage and no
serious or unexpected side effects occurred. However, vincristine has never been given with
fenretinide or fenretinide plus ketoconazole before. Vincristine has been been given before
with ketoconazole to both children and adults with neuroblastomas and other cancers.

Inclusion Criteria:

- Diagnosed with neuroblastoma either by histological verification of neuroblastoma
and/or demonstration of tumor cells in the bone marrow with increased urinary
catecholamines

- Patients must have high-risk neuroblastoma with at least ONE of the following:

1. Recurrent/progressive disease at any time

2. Refractory disease (i.e. less than a partial response to frontline therapy)

3. Persistent disease after at least a partial response to frontline therapy (i.e.
patient has had at least a partial response to frontline therapy but still has
residual disease by MIBG, CT/MRI, or bone marrow)

- Patients must have at least ONE of the following sites of disease:

1. Measurable tumor on MRI or CT scan or X-ray

2. MIBG scan with positive uptake at minimum of one site

3. Bone marrow with tumor cells seen on routine morphology

- Patients with a history of complete surgical resection of CNS lesions are eligible if
there is no evidence of CNS lesions (MRI or CT required) at study entry evaluation
and if other entry criteria are met

- Patients must have a performance status of 0, 1 or 2 (Appendix I). Patients who are
unable to walk because of paralysis or tumor pain, but who are up in a wheelchair,
will be considered ambulatory for the purpose of assessing the performance score

- Patients must have a life expectancy of greater than or equal to 8 weeks

- Patients must have fully recovered from the acute toxic effects of all prior
chemotherapy, immunotherapy, or radiotherapy prior to entering this study

1. Must not have received myelosuppressive chemotherapy and/or biologics within 3
weeks of entry onto this study (4 weeks if prior nitrosourea)

2. Patients must not have received radiation for a minimum of two weeks prior

3. Patients are eligible 12 weeks after autologous stem cell transplant

4. Minimum of six weeks is required following prior therapeutic doses of MIBG.

5. There is no limit on number of prior regimens

6. Must not have received any hematopoietic growth factors within 7 days/

7. Prior therapy with fenretinide and/or fenretinide + ketoconazole is allowed if
no DLT's were experienced. Prior therapy with other retinoids

- Patients must NOT receive other anti-cancer agents while on study

- Palliative radiation is allowed to sites that will not be used to measure response
during this study

- All patients must have adequate organ function defined as:

1. Hemoglobin greater than or equal to 8.0

2. ANC greater than or equal to 500 (7 days after last dose of growth factor)

3. Platelet count: greater than or equal to 50,000 at least one week since last
platelet transfusion

4. Age-adjusted serum creatinine < 1.5 x normal for age

5. Patient must have normal cardiac function documented by ejection fraction (>
55%) documented by echocardiogram or radionuclide MUGA evaluation or fractional
shortening ( > 27%) documented by echocardiogram and EKG must demonstrate no
abnormality severe enough to justify cardiac medications and baseline QTc
interval less than or equal to 450 msecs

6. Total bilirubin less than or equal to 1.5 x normal for age

7. SGPT (ALT) and SGOT (AST) less than or equal to 3 x normal for age

8. Normal prothrombin time (PT) for age

9. Baseline hepatitis titers without evidence of acute/active hepatitis

10. Serum triglycerides < 300mg/dL fasting or on a random plasma test

11. Serum calcium < 11.6mg/dL

12. No hematuria and/or proteinuria greater than 1+ on urinalysis

- Patients with a seizure disorder are study eligible if seizures are controlled on
anticonvulsants

- Normal lung function as manifested by no dyspnea at rest and no oxygen requirement

- Negative serum beta-HCG in females, and use of effective contraception in males and
females of child-bearing potential, is required

- Skin toxicity no greater than grade 1

- Patients with known genetic metabolic conditions, or other ongoing serious medical
issues, must be approved by the Study Chair prior to registration

Exclusion Criteria:

- Patients with CNS parenchymal or meningeal-based lesions that are present at study
entry evaluation are NOT eligible

- Pregnancy or breast feeding. Due to the potential teratogenic effects of retinoids,
pregnant women are NOT eligible. Breast milk feeding by study patient is NOT allowed

- Patients with history of organ and allogeneic stem cell transplantation

- Patients with a known history of allergy to soy products

- Patients with a known history of a severe allergy or sensitivity to wheat gluten

- Patients requiring anti-arrhythmia cardiac medications are NOT eligible

- Prior therapy with fenretinide, or fenretinide + ketoconazole, if DLT's were
experienced

- A known history of intolerance to ketoconazole

- A known history of intolerance to vincristine

- Patients on other essential medications for which an interaction with ketoconazole
can be expected and for which dose reductions to other essential medications cannot
be made in a manner adequate to ensure patient safety

- Patients who, in the opinion of the investigator, may not be able to comply with the
safety monitoring requirements of the study

- Active hepatitis

- Baseline cardiac QTc interval > 450 msecs