The treatment being investigated is a patient- and tumor-specific therapy known as a personalized active immunotherapy. Personalized active immunotherapy is an attempt to use a person's own immune system to combat disease. Sargramostim (a.k.a. GM-CSF) is given together with the personalized active immunotherapy because it may increase the immune system's response and, therefore, aid in the effect of the personalized active immunotherapy.

This approach has previously been studied in patients with follicular Non-Hodgkin's lymphoma and other B-cell malignancies. Encouraging efficacy results and a favorable safety profile have been seen to date in these studies.

Inclusion Criteria:

1. Written informed consent
2. Previously untreated follicular NHL
3. Stage III or IV disease requiring treatment
4. Able to receive rituximab and chemotherapy (rituximab with cyclophosphamide, vincristine, and prednisone either with or without doxorubicin)
5. Able to provide tumor sample adequate for Id-KLH manufacture
6. ≥ 18 years of age
7. At least one bi-dimensionally measurable lesion ≥ 2 cm by CT scan