Evaluation of CHOP Plus Involved Field Radiotherapy Followed by Yttrium-90 Ibritumomab Tiuxetan for Stages I, IE, and Non-Bulky Stages II and IIE, CD20 Positive, High-Risk Localized, Aggressive Histologies of Non-Hodgkin Lymphoma, Phase II

Inclusion Criteria

DISEASE CHARACTERISTICS:

- Histologically confirmed aggressive non-Hodgkin's lymphoma of 1 of the following
subtypes:

- Diffuse large B-cell

- Mantle cell

- High-grade B-cell, Burkitt's, or Burkitt-like

- Anaplastic large cell (B-cell phenotype only)

- Stage I, IE, or non-bulky* stage II or IIE disease by Ann Arbor classification

- Patients who have bulky stage II or IIE disease are ineligible even if, after
resection, the measurements are less than 10.0 cm NOTE: *Non-bulky disease
defined as any tumor measuring less than 10.0 cm or occupying less than 1/3 of
the chest diameter

- CD20-expressing disease by flow cytometry or immunoperoxidase staining

- Aggressive lymphomas must have at least 1 of the following adverse prognostic
factors:

- Non-bulky stage II or IIE disease

- At least 60 years of age

- Zubrod performance status of 2

- Lactic dehydrogenase greater than upper limit of normal

- All disease must be encompassable in a single radiation port (including any site of
resected disease) 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 former terminology of "low", "intermediate", or "high" grade lymphoma.
However, this protocol uses the former terminology.

PATIENT CHARACTERISTICS:

Age

- Over 18

Performance status

- Zubrod 0-2

Life expectancy

- Not specified

Hematopoietic

- Not specified

Hepatic

- Not specified

Renal

- Not specified

Other

- Not pregnant or nursing

- Negative pregnancy test

- Fertile patients must use effective contraception

- No other malignancy within the past 5 years except adequately treated basal cell or
squamous cell skin cancer or carcinoma in situ of the cervix

- No medical contraindication to study chemotherapy, rituximab, or ibritumomab tiuxetan

- No known AIDS syndrome or HIV-associated complex

PRIOR CONCURRENT THERAPY:

Biologic therapy

- No prior monoclonal antibody therapy

Chemotherapy

- No prior chemotherapy for lymphoma

Endocrine therapy

- Not specified

Radiotherapy

- See Disease Characteristics

- No prior radiotherapy for lymphoma

- No concurrent intensity-modulated radiotherapy

- Planned involved-field radiotherapy must not encompass more than 25% of active bone
marrow space

Surgery

- See Disease Characteristics

Other

- Concurrent participation in SWOG-8947 or SWOG-8819 allowed