PITTSBURGH — A city man may have to overcome extremely long odds — 13.7 quintillion-to-1 — when he stands trial on charges that he robbed and killed his next-door neighbors, two sisters of an Iowa state lawmaker.

Those are the odds a pair of sweat pants could belong to any other black man except the suspect, 43-year-old Allen Darell Wade, based on DNA found on the waistband, according to lab test results presented by prosecutors at a preliminary hearing Friday.

A city magistrate ruled Wade must stand trial based on the DNA evidence and nine surveillance videos Allegheny County prosecutors believe link Wade to the sweat pants, a vehicle and two bank cards belonging to victims Sarah and Susan Wolfe.

Defense attorney Blaine Jones said his client continues to maintain his innocence but acknowledged he’ll have to overcome long odds if he can’t find an expert to rebut the DNA evidence.

“The one item they believe he was wearing, the probability says it was Mr. Wade’s,” Jones said.

Police have yet to detail a motive for the killings. The victims were sisters of state Rep. Mary Wolfe, a Democrat from Clinton, Iowa.