Nivolumab in patients with relapsed or refractory peripheral T-cell lymphoma: modest activity and cases of hyperprogression =========================================================================================================================== * N Nora Bennani * Hyo Jin Kim * Levi D Pederson * Pamela J Atherton * Ivana N Micallef * Gita Thanarajasingam * Grzegorz S Nowakowski * Thomas Witzig * Andrew L Feldman * Stephen M Ansell