On the topology of manifolds with positive isotropic curvature
  We show that a closed orientable Riemannian $n$-manifold, $n \ge 5$, with positive isotropic curvature and free fundamental group is homeomorphic to the connected sum of copies of $S^{n-1} \times S^1$. 
Siddartha Gadgil, Harish Seshadri