What is the best treatment for lymphatic cancer?

Depends. I assume you mean lymphoma. There are different kinds, from very aggressive to very slow growing. Treatment depends on the particular kind, the stage (how advanced), and the age and general health of the patient. It may include observation (yes, sometimes we do not need to treat them), chemotherapy (plus or minus Rituxan), or radiotherapy. Best to you.
Lymphoma therapy. The best therapy for lymphoma is systemic chemotherapy +/- rituxan (rituximab) with radiaiton depending upon the stage. Bone marrow transplant is also a good treatment option depending upon the situation.