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PacifiCare Health Systems


said President and Chief Executive Robert O'Leary resigned after about four months on the job.

The company said Chief Financial Officer Howard Phanstiel will assume the position until a replacement is found. Phanstiel, who joined PacifiCare in July from

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, where he was chairman and CEO, was also named to the board.

In a release announcing his resignation, O'Leary tied his decision to the company's shift in short- and long-term priorities, saying his skills and background were "not a good fit to address the company's immediate priorities."