Wyeth, the pharmaceutical company, paid ghostwriters to produce medical journal articles favorable to its female hormone replacement therapy Prempro, according to Congressional letters seeking more information about the company's involvement in medical ghostwriting. At least one article was published even after a federal study found the drug raised the risk of breast cancer.
The letters, sent electronically Friday by Senator Charles E. Grassley, ask Wyeth and DesignWrite, a medical writing firm, to disclose payments related to the preparation of journal articles and the activities of doctors who were recruited to put their names on them for publication.
The letters are part of a continuing investigation by Mr. Grassley, a member of the Senate Finance Committee, into drug industry influence on doctors.
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