(CNN) Evelyn Yang, whose appearance on CNN last month to share her story of alleged sex assault at the hands of a former Columbia University gynecologist spurred a cascade of new accusers against the same doctor, applauded the announcement by the Manhattan district attorney's office that it plans to investigate the new claims, but said the DA and university must be held to account as well.

Yang, wife of former Democratic presidential candidate and CNN contributor Andrew Yang, told CNN on Friday that the announcement to investigate the new claims against Robert Hadden "doesn't erase how they grossly mishandled all the initial cases, including mine."

"While this is a good start, it's not addressing the root of the problem," Yang said. "We need to be asking why there are over 70 women and counting who have now come forward about being assaulted by this same doctor. The DA's office should be investigating the hospital for allowing this doctor to prey on so many patients over decades, when they had indication from multiple sources that he was acting inappropriately."

Marissa Hoechstetter, another alleged victim of Hadden's, has repeatedly called on Manhattan District Attorney Cyrus Vance to resign. She was unmoved by the DA's announcement referring to it as "image rehab ahead of the (Harvey) Weinstein verdict ."

"Vance and his office simply do not have the public trust or credibility to conduct an investigation, and we call on Governor (Andrew) Cuomo and Attorney General (Letitia) James to immediately appoint a special prosecutor in his place," she said Friday in a statement.

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