As lawyers argued over which evidence should be allowed, a judge in Little Rock, Ark., Monday delayed jury selection in the first trial of 4,500 lawsuits filed nationwide that challenge Prempro, a hormone-replacement therapy that some women say causes breast cancer.

Linda Reeves of Benton, Ark., sued drug maker Wyeth, claiming she developed breast cancer after taking Prempro for eight years. Helene Rush of Little Rock has argued similar claims in a federal suit against the drug maker. Rush has an Oct. 10 court date.