WESTMINSTER, Colo.--(BUSINESS WIRE)--Allos Therapeutics, Inc. (Nasdaq:ALTH) today announced preliminary top line results from PROPEL, the Company’s pivotal Phase 2 trial of pralatrexate (PDX) in patients with relapsed or refractory peripheral T-cell lymphoma (PTCL), at the 50th Annual Meeting of the American Society of Hematology (abstract 261).