Treatment and Natural History Study of Lymphomatoid Granulomatosis

For lymphomatoid granulomatosis (LYG) Grade 1 and 2: Interferon starting at 7.5 million Units subcutaneous (subQ) 3 times a week and increasing on the following schedule: 10 million U; 15 million U; 20 million U; 25 million U; and increased in 5 million U increments, as tolerated. Patients continue taking interferon for 1 year beyond complete remission (CR).

For lymphomatoid granulomatosis (LYG) Grade 3: EPOCH-R (etoposide, prednisone, vincristine, cyclophosphamide, doxorubicin, rituximab) every 3 weeks for 6 cycles.

Baseline (optional).

Baseline.

Baseline.

Baseline.

Arm 1: At baseline, then every 4 weeks until on stable dose of interferon or a maximum of 6 monthly scans, then every 3 months while receiving interferon, and following completion of interferon. In surveillance, every 3 months for 1 year, every 4 months for 1 year, every 6 months for 1 year and yearly thereafter for 2 years. Arm 2: At baseline, following cycle 4, and following cycle 6 of etoposide, prednisone, vincristine, cyclophosphamide, doxorubicin, and rituximab (DA-EPOCH-R). In surveillance, every 3 months for 1 year, every 4 months for 1 year, every 6 months for 1 year and yearly thereafter for 2 years.

"Arm 1: At baseline, then every 4 weeks until on stable dose of interferon or a maximum of 6 monthly scans, then every 3 months while receiving interferon, and following completion of interferon. In surveillance, every 3 months for 1 year, every 4 months for 1 year, every 6 months for 1 year and yearly thereafter for 2 years (patients with central nervous system (CNS) disease only).~Arm 2: At baseline, following cycle 4, and following cycle 6 of etoposide, prednisone, vincristine, cyclophosphamide, doxorubicin, and rituximab (DA-EPOCH-R). In surveillance, every 3 months for 1 year, every 4 months for 1 year, every 6 months for 1 year and yearly thereafter for 2 years (patients with CNS disease only)."

For participants receiving \> 450 mg/m\^2 doxorubicin.

Arm 1: Baseline and following completion of interferon. Arm 2: Baseline and following completion of etoposide, prednisone, vincristine, cyclophosphamide, doxorubicin, and rituximab (DA-EPOCH-R).