DISEASE CHARACTERISTICS:

• Histologically or cytologically confirmed malignant peripheral nerve sheath tumor

  • Malignant schwannoma or neurofibrosarcoma
  • Clinical evidence of unresectable or metastatic disease
• Measurable disease
• No known current CNS metastases

PATIENT CHARACTERISTICS:

Age

• 18 and over

Performance status

• Zubrod 0-2

Life expectancy

• Not specified

Hematopoietic

• Absolute neutrophil count greater than 1,500/mm^3
• Platelet count greater than 100,000/mm^3

Hepatic

• Bilirubin less than 1.5 times upper limit of normal (ULN)
• SGOT or SGPT less than 1.5 times ULN (5 times ULN for patients with documented liver metastases)

Renal

• Creatinine no greater than 1.5 times ULN
• Creatinine clearance greater than 60 mL/min

Ophthalmic

• No known history of any of the following corneal diseases:

  • Dry eye syndrome
  • Sjögren's syndrome
  • Keratoconjunctivitis sicca
  • Exposure keratopathy
  • Fuch's dystrophy
• No other active disorders of the cornea

Gastrointestinal

• No gastrointestinal tract disease resulting in an inability to take oral medication or a requirement for IV alimentation
• No active peptic ulcer disease
• No intractable nausea or vomiting
• Able to swallow medications OR receive enteral medications via gastrostomy feeding tube

Other

• Not pregnant or nursing
• Fertile patients must use effective contraception
• No other malignancy within the past 5 years except adequately treated basal cell or squamous cell skin cancer, carcinoma in situ of the cervix, or adequately treated stage I or II cancer currently in complete remission

PRIOR CONCURRENT THERAPY:

Biologic therapy

• More than 28 days since prior biologic therapy for this malignancy

Chemotherapy

• More than 28 days since prior chemotherapy for this malignancy

Endocrine therapy

• Not specified

Radiotherapy

• More than 60 days since prior radiotherapy to the target lesion with subsequent documented progression
• More than 60 days since prior radiofrequency ablation to the target lesion with subsequent documented progression
• No concurrent radiotherapy

Surgery

• At least 3 weeks since prior major surgery and recovered
• No prior surgical procedure affecting absorption

Other

• More than 28 days since prior investigational drugs for this malignancy
• More than 60 days since prior embolization to the target lesion with subsequent documented progression
• No prior epidermal growth factor receptor-targeting therapy
• No concurrent antiretroviral therapy for HIV-positive patients
• No other concurrent investigational or commercial agents or therapies for the malignancy