PROPEL, a multicenter phase II open-label study-the largest prospective clinical trial in patients with relapsed or refractory peripheral T-cell lymphoma-found that the investigational chemotherapy agent pralatrexate produces complete responses (disappearance of all signs of cancer) in patients who had previously failed an average of three treatment regimens, including an autologous stem cell transplant for some patients. Designed to be selectively transported into tumor cells, the novel antifolate pralatrexate accumulates to high concentrations in the tumor cell, inhibiting DNA synthesis, said Owen A. O’Connor, md, phd, Columbia University Medical Center, New York, at the ASH meeting (abstract 261).