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The Food and Drug Administration says it will temporarily allow the importation of a replacement for Doxil.

The drug, which treats ovarian and other cancers, is one of several cancer drugs that is becoming increasingly hard to find.

The agency also approved another supplier for a preservative-free version of methotrexate, used to treat children with a type of leukemia as well as for bone cancer.

"We believe that we will be able to meet the needs of patients on a continuing basis. This should resolve the shortage."

Drug shortages are caused by problems with sterility and other serious issues that prompt shutdowns of production lines and sometimes entire factories.

Cancer patients who miss multiple treatments are far less likely to eventually recover.

Nearly 300 drugs of all types are currently in short supply.

However, the FDA Commissioner says the Obama administration's efforts to urge drug companies to provide earlier notification of potential shortages has prevented more than 100 potential shortfalls over the past four months.