A Rhode Island oncologist on Monday amended his defamation lawsuit against a former cancer patient and others he says published and distributed "false accusations of sexual assault and dishonesty" about him as part of a campaign to destroy his personal and professional reputation. Dr. Timothy J. Kinsella also alleges false statements were circulated about him by Amelia L. Weber, of Tucson, Ariz., and several unknown individuals on the website acancerdoctor.org, in leaflets distributed on the grounds of two Rhode Island hospitals and in communications to people including former Ohio Gov. Ted Strickland and Brown University President Ruth Simmons.