Lawyers for a man who died from brain cancer are trying to salvage a lawsuit against Dow-owned Rohm & Haas Co. after a judge found that changes a causation expert witness made to his report in the middle of trial were "tantamount to fraud on the court."

At stake in the case is the future of more than 30 cases in which plaintiffs allege that a cluster of brain cancers and brain tumors in a small village on the shores of an Illinois lake is not just a random occurrence and the cause of those illnesses can be attributed to the negligence, even the recklessness, of a chemical company with a plant about a mile north of the village.