KANSAS CITY, Mo. — Melvin Ejim had 24 points and 10 rebounds, Dustin Hogue added 19 points and 10 boards and No. 16 Iowa State held on through a tense final minute to beat Kansas State 91-85 in the quarterfinals of the Big 12 tournament.Georges Niang added 18 points and Naz Long finished with 14 points for the fourth-seeded Cyclones (24-7), who advanced to play the winner of Kansas-Oklahoma State in Friday’s semifinals. Iowa State was clinging to an 87-85 lead with just over a minute left when Ejim missed a layup and the Wildcats (20-12) got the rebound. They raced the other direction, but Shane Southwell lost control of the ball going toward the rim and Iowa State came away with it. Long was fouled and made both free throws with 16.2 seconds left. Marcus Foster missed a 3 at the other end, and Long scored a layup in transition to put an exclamation mark on the win.