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After fighting breast cancer with lots of chemotherapy and surgery, Jennine Elkins rejoiced last month, believing she was through the worst.
Then the 38-year-old math teacher from Staten Island, N.Y., got some bad news. Her heart was getting weaker—and doctors felt it was due to Herceptin, a potentially life-saving drug she was on to prevent the cancer from returning. The hospital stopped the drug.
Now Ms. Elkins is waiting…