II. To assess the safety and preliminary efficacy of single agent carfilzomib in patients with relapsed and refractory peripheral T-cell lymphoma (PTCL) including angioimmunoblastic T-cell lymphoma (AITL), anaplastic large cell lymphoma (ALCL) ALK+/ALK-, adult T-cell leukemia/lymphoma (ATLL), NK-cell lymphoma (NKL), transformed mycosis fungoides (MF) to large cell, and PTCL-unspecified (PTCL-U).