A lawyer specialising in abuse at the firm representing the 72 victims of Jimmy Savile said there were concerns that inquiries into other hospitals had only just started.
Liz Dux said all of the victims represented by Slater & Gordon had given detailed statements to Operation Yewtree, the police investigation into sexual abuse sparked by the Savile scandal.
Ms Dux said: "Whilst the victims of Savile would wish to ensure that the NHS inquiry is as comprehensive as possible, they have real concerns as to why the Department of Health has only just started its investigations into other hospitals now.
"The victims will be very upset about further delays into the NHS inquiry which will prolong their suffering."
More top news
David Cameron said the June 23 referendum is the most important vote young people will place in their lifetimes.
Plan would leave steelworkers worse off in retirement - but not as worse off as those in other pension schemes.
Donald Trump has labelled Hillary Clinton "crooked" and says he cannot wait to face her in November's US presidential election.