The purpose of this study is to evaluate the efficacy (and safety) of the following treatment squeme:Ciclophosphamide, Vincristine, lyposomal Doxorrubicine (Myocet) and Prednisone,combined with Rituximab in first line treatment for patients with aggresive No Hodgkin B lymphoma and cardiovascular risk

Phase II, multicenter, open , 1-arm study.

Inclusion Criteria:

1. Patients with histological diagnosis of Lymphoma no Hodgkin B CD20+ high degree of mailgnancy
2. Patients no previously treated
3. stage III o IV
4. Informed consent
5. At least one measurable injury
6. Age >18
7. ECOG 0-2
8. Life expectancy >6 months
9. Cardiovascular risk defined as:Mild-moderate systolic dysfunction,isquemic cardiopathy, diabetes mellitus, hypertension,left ventricular hypertrophy, cardiac arrhythmia, moderate pulmonar hypertension
10. adequate organic functionallity (creatinine<2mg/dl;bilirubin<2mg/dl; ALT-AST-FA<5 FSN; neutrphyls total count >1.5x 109/l and platellet count >100x1097l)
11. Use of a contraceptive method during study + 3 months -

Exclusion Criteria:

1. stage I or II with IPI=0
2. Symptomatic tumoral affection of Nervous central system
3. Lymphoma no hodgkin B indolent
4. Lymphoma no hodgkin B mantle-cell
5. Lymphoma no hodgkin T
6. lymphoprolifertaive syndrome post-transplantation or immunosuppression associated
7. cardiovacualr disease symptomatic
8. Cronic infection or acute serious
9. history of neoplasia in past 5 years
10. not able to understand the study or poor protocol adherence
11. Known Hypersensivity to any atudy drug
12. pregnant/lactant women
13. Previous participation in clinicla study in past 30 days
14. Previous treatment with antraciclines or any drug used in this study