DISEASE CHARACTERISTICS:

• Histologically confirmed relapsed or refractory cutaneous T-cell lymphoma

  • Large cell transformation of cutaneous T-cell lymphoma allowed
• No active CNS disease

PATIENT CHARACTERISTICS:

Age:

• 16 and over

Performance status:

• Zubrod 0-2

Life expectancy:

• Not specified

Hematopoietic:

• Absolute neutrophil count at least 1,000/mm^3*
• Platelet count at least 100,000/mm^3* NOTE: *Unless attributable to marrow or splenic involvement by lymphoma

Hepatic:

• Bilirubin no greater than 1.5 times upper limit of normal (ULN)
• SGPT no greater than 2.5 times ULN

Renal:

• Creatinine clearance greater than 50 mL/min

Cardiovascular

• No history of symptomatic cardiac dysfunction
• No history of pericardial effusion

Other:

• HIV negative
• No grade 2 or greater sensory or motor neuropathy
• No history of seizures
• No other malignancy within the past 5 years except curatively treated basal cell carcinoma of the skin of carcinoma in situ of the cervix
• No medical, psychiatric, or social condition that would preclude study
• No other concurrent serious illness or active infection
• Not pregnant or nursing
• Negative pregnancy test
• Fertile patients must use effective contraception

PRIOR CONCURRENT THERAPY:

Biologic therapy:

• No prior stem cell or bone marrow transplantation (BMT)
• No more than 1 prior immunotherapy regimen
• No more than 3 prior systemic regimens with denileukin diftitox
• At least 3 weeks since prior biologic therapy
• No concurrent BMT

Chemotherapy:

• No prior 506U78

• No more than 3 prior systemic chemotherapy regimens comprising any of the following:

  • Oral methotrexate
  • Topical mechlorethamine
• At least 3 weeks since prior chemotherapy
• No other concurrent chemotherapy

Endocrine therapy:

• At least 3 weeks since prior anticancer endocrine therapy
• No concurrent topical or systemic steroids

Radiotherapy:

• At least 3 weeks since prior radiotherapy

• No more than 3 prior systemic regimens comprising any of the following:

  • Total skin electron beam therapy
  • Spot radiotherapy

Surgery:

• Not specified

Other:

• No more than 3 prior systemic regimens comprising any of the following:

  • Oral retinoids
  • Ultraviolet therapy (PUVA)
• At least 3 weeks since prior anticancer therapy