Donor Bone Marrow Derived Mesenchymal Stem Cells in Controlling Heart Failure in Patients With Cardiomyopathy Caused by Anthracyclines

This study is testing whether stem cells donated from another person's bone marrow can help improve heart function in patients whose hearts were weakened by certain cancer chemotherapy drugs called anthracyclines. **You may be eligible if...** - Your heart pumping function is at or below 40% (measured by a heart scan) and this was caused by anthracycline chemotherapy for any type of cancer - You are between 18 and 90 years old - You speak English or another language (non-English speakers are welcome) - Your heart failure symptoms are mild to moderate (NYHA class I, II, or III) - If you also received a drug called trastuzumab (Herceptin), your heart problems must have continued for at least 90 days after stopping it - You can complete a 6-minute walking test **You may NOT be eligible if...** - Your heart weakness was caused by something other than chemotherapy - Your heart failure is severe (NYHA class IV) - You have other serious health conditions that would make participation unsafe Talk to your doctor to see if this trial is right for you.