Plagiarism, "unethical research" and unreliable findings from "fabricated data" are grounds for retraction of medical journal articles according to the Committee on Publication Ethics (COPE).
But one look at the US National Library of Medicine database reveals that bogus, ghostwritten papers Wyeth (now Pfizer) planted in medical journals in a scandal which reached the US Congress last year, still stand, unretracted.
"Is there an association between hormone replacement therapy and breast cancer?" asks an unretracted article in the Journal of Women's Health, 1998 Dec;7(10):1231-46--a question a fourth grader could answer in the affirmative.
(Note: You can view every article as one long page if you sign up as an Advocate Member, or higher).