brA former Biopure Corp. executive has pleaded guilty to obstruction of justice for pretending he had terminal cancer to dodge a lawsuit by federal securities regulators. Howard Richman admitted in federal court Wednesday he had instructed his lawyers to tell a judge that he was gravely ill with colon cancer. Richman also admitted to posing as his doctor in a phone call with his lawyer so that she would tell the judge that his cancer had spread and that he was undergoing chemotherapy. a target=_blank rel=nofollow href=’http://www.law.com/jsp/article.jsp?id=1202428985561rss=newswire’Continue…/abr