DISEASE CHARACTERISTICS:

• Histologically confirmed chronic lymphocytic leukemia OR small lymphocytic lymphoma

  • Stage III-IV OR

  • Stage I-II, if determined to have disease progression evidenced by 1 of the following characteristics:

    • Rapid doubling of peripheral lymphocyte count
    • Progressive lymphadenopathy
    • Progressive splenomegaly
    • B symptoms
    • Grade 2 or 3 fatigue
• CD23+ disease
• Progressive disease after at least 1 prior chemotherapy course

PATIENT CHARACTERISTICS:

Age

• 18 and over

Performance status

• WHO 0-2

Life expectancy

• At least 6 months

Hematopoietic

• Platelet count at least 50,000/mm^3

Hepatic

• Bilirubin no greater than 2.0 mg/dL
• AST/ALT no greater than 1.5 times upper limit of normal (ULN)

Renal

• Creatinine no greater than 1.5 times ULN

Cardiovascular

• No New York Heart Association class III or IV cardiac disease
• No myocardial infarction within the past 6 months
• No unstable arrhythmia
• No evidence of ischemia on EKG within the past 14 days

Pulmonary

• FEV_1 at least 60% of predicted
• DLCO at least 55% of predicted

Other

• Not pregnant or nursing
• Negative pregnancy test
• Fertile patients must use effective contraception during and for 3 months after study treatment
• HIV negative
• No secondary malignancy requiring active treatment (except hormonal therapy)
• No serious nonmalignant disease that would preclude study participation
• No active uncontrolled bacterial, viral, or fungal infection
• No clinically active autoimmune disease

PRIOR CONCURRENT THERAPY:

Biologic therapy

• More than 4 weeks since prior anticancer biologic therapy
• More than 4 weeks since prior anticancer radioimmunotherapy
• No prior exposure to IDEC-152 or anti-CD23 antibodies

Chemotherapy

• See Disease Characteristics
• More than 4 weeks since prior anticancer chemotherapy

Endocrine therapy

• Concurrent hormonal therapy allowed for second malignancy

Radiotherapy

• More than 4 weeks since prior anticancer radiotherapy

Surgery

• More than 4 weeks since prior major surgery (except for diagnostic surgery)

Other

• More than 4 weeks since prior anticancer investigational therapy
• No other concurrent anticancer therapy