Clinical Study to Evaluate The Cardioprotective Effect of Pentoxifylline Against Doxorubicin Induced Cardiotoxicity in Breast Cancer Patients

Inclusion Criteria: * Age ≥18 years old. * Chemo-naïve patients with biopsy confirmed diagnosis of breast cancer and with stage I-III breast cancer according to the American Joint Committee on Cancer (TNM staging system of breast cancer). * Patients intended to receive at least 4 cycles of doxorubicin or more. * Patients with performance status \<2 according to Eastern Cooperative Oncology Group (ECOG) score. * Echocardiographic LVEF ≥55%. * Adequate baseline hematologic values (absolute neutrophilic count ≥ 1.5 ×109/L, platelet count ≥ 90 × 109/L and hemoglobin level ≥ 10 g/dl). * Patients with adequate liver function and adequate renal function. * Signed informed consent to participate in the study. Exclusion Criteria: * Age \<18 years old and \>65 years old. * Women with history of breast cancer. * Formerly treated with DOX. * Patients with a known hypersensitivity to any of the used drugs. * Treatment with blood thinners for 6 months prior to the screening. * Treatment with NSAIDS like ketorolac,ibuprofen. * Patients taking any other cardioprotective medications. * Pregnancy and breast feeding. * Alcohol abuse. * Creatine Clearance \< 50 mL/min. * History of heart failure or LVEF \<50%. * Presence of any cardiac-related conditions such as angina pectoris, valvular disease, uncontrolled systemic hypertension, coronary heart disease, and cardiac surgery within the last 3 months.