Inclusion Criteria

Inclusion criteria:

- Confirmed diagnosis of VHL disease

- One or more measurable CNS hemangioblastoma, if symptomatic, must be refractory or
not amenable to standard therapy, if asymptomatic, must have had at least one prior
neurosurgical treatment/ procedure; and/or: at least one untreatable or
treatment-refractory retinal hemangioblastoma that is causing impaired visual
function

- Karnofsky Performance Status >=60

- Life expectancy > 3 months

- Able to sign informed consent

- Adequate hematologic status, liver and kidney function

Exclusion criteria:

- Patients with other VHL-related tumors requiring or amenable to standard treatment

- Severe or uncontrolled concurrent illnesses that could compromise participation in
the study

- Total urinary protein in 24 hour collection > 500 mg

- Pregnant or breast feeding females, adults of reproductive potential not using
effective contraception (hormonal methods not considered effective due to possible
decreased effectiveness secondary to drug interaction with PTK787). Women of
childbearing potential must have negative serum pregnancy test prior to initiation of
treatment.

- Acute or chronic liver disease

- Diagnosis of HIV infection

- GI function that may alter absorption of PTK787

- Patients taking coumadin (warfarin sodium)

- Prior therapies (investigational drugs, chemotherapy) within 4 weeks prior to study
entry

- Prior therapies (biologic, hormonal, immunotherapy, radiation therapy, surgery)
within two weeks prior to study entry.

- Patients unwilling or unable to comply with protocol requirements

- Patients with concurrent, non VHL-related malignancies other than non-melanoma skin
cancer

- Patients with contraindication to MRI imaging