Bayer sued Johnson & Johnson for making "false and misleading claims" about competing prostate cancer drugs. According to Bayer, J&J launched a "false advertising campaign" based on faulty data. The aim of the campaign was to illegally promote J&J's medicine as more effective than Bayer's products. Bayer accuses J&J of using incorrect information to damage its market position. The lawsuit focuses on comparative claims about the effectiveness of prostate cancer therapies. The conflict concerns directly competing drugs for this type of oncological disease.