Epratuzumab in Treating Patients With Non-Hodgkin’s Lymphoma

DISEASE CHARACTERISTICS:

Histologically confirmed low-grade follicular B-cell non-Hodgkin's lymphoma

Small cleaved cell OR
Mixed cell

The following are ineligible:

Primary CNS lymphoma
HIV lymphoma
Richter's lymphoma
Bulky disease (any single mass greater than 10 cm)
Pleural effusion with positive cytology for lymphoma
Failed prior standard chemotherapy for non-Hodgkin's lymphoma

Refractory to at least 1 prior treatment with rituximab

Disease progression or failure to achieve objective response within 6 months of beginning rituximab therapy

At least 1 bidimensionally measurable lesion

At least 1.5 cm by CT scan NOTE: A new classification scheme for adult non-Hodgkin's lymphoma has been adopted by PDQ. The terminology of "indolent" or "aggressive" lymphoma will replace the terminology of "low", "intermediate", or "high" grade lymphoma. However, this protocol uses the former terminology.

PATIENT CHARACTERISTICS:

Age:

18 and over

Performance status:

Karnofsky 60-100%
ECOG 0-2

Life expectancy:

At least 4 months

Hematopoietic:

Absolute granulocyte count at least 1,500/mm^3
Platelet count at least 50,000/mm^3
Hemoglobin at least 8 g/dL
Transfusion independent

Hepatic:

Bilirubin no greater than 1.5 times upper limit of normal (ULN)*
Alkaline phosphatase less than 2 times ULN*
AST less than 2 times ULN* NOTE: *Unless lymphoma-related

Renal:

Creatinine no greater than 1.5 times ULN unless lymphoma-related

Other:

No other malignancy within the past 5 years except squamous or basal cell skin cancer or carcinoma in situ of the cervix
No other serious condition or infection that would preclude study participation
Not pregnant or nursing
Negative pregnancy test
Fertile patients must use effective contraception during and for 3 months after study participation

PRIOR CONCURRENT THERAPY:

Biologic therapy:

See Disease Characteristics
At least 12 weeks since prior autologous stem cell transplantation
No prior radioimmunoconjugate therapies

Chemotherapy:

See Disease Characteristics
No more than 4 prior treatment regimens
At least 4 weeks since prior chemotherapy

Endocrine therapy:

At least 2 weeks since prior corticosteroids
No concurrent steroids

Radiotherapy:

See Biologic therapy
At least 4 weeks since prior radiotherapy to target lesion

Surgery:

At least 4 weeks since prior major surgery unless recovered

Other:

At least 4 weeks since prior experimental therapies
No other concurrent investigational or therapeutic agents