Patient description: The patient is a 55 year old man visiting his primary care physician for lower urinary tract symptoms including frequency, urgency, weak stream, incomplete emptying and intermittent flow for the past 9 months. Further evaluation revealed: IPSS score : 15 Post-void residual: 70 mL Prostate volume (TRUS): 60 mL Prostate-specific antigen (PSA) level: 3.2 ng/mL 10 mL/sec of maximum flow rate when urine volume was 130 mL He is otherwise healthy only using Vit D 1000 units daily. His recent blood chemistry (3 days ago) was normal: Hgb: 13.5 g/dl WBC: 135000 /mm3 Plt: 350000 /ml PT: 11 second PTT: 35 second INR: 0.9 Creatinine: 0.5 mg/dl BUN: 10 mg/dl U/A: Color: yellow Appearance: cloudy PH: 5.3 Specific gravity: 1.010 Glc: 100 Nitrite: negative Ketone: none Leukocyte esterase: negative RBC: negative WBC: 2 WBCs/hpf U/C: negative

Clinical trial eligibility criteria: eligible ages (years): 18.0-999.0,  Lymphoma, Non-Hodgkin Lymphoma Histologically-confirmed B-cell non-Hodgkin's lymphoma (Mantle Cell Lymphoma, Follicular Lymphoma, Small Lymphocytic Lymphoma/Chronic Lymphocytic Leukemia, Marginal Zone Lymphoma, Diffuse Large B-cell Lymphoma, and Lymphoplasmacytic Lymphoma) Must have relapsed or refractory disease after 2 or more prior lines of therapy; 1 line of therapy is allowed, if it included an autologous stem cell transplant and at least 12 weeks have elapsed from Day 0. A line of therapy is defined as a course of therapy that is not interrupted by progressive disease Subjects must have measurable disease of at least 1.5 cm in diameter Age ≥ 18 years Life expectancy ≥ 3 months Eastern Cooperative Oncology Group (ECOG) performance status 0-2 Females of childbearing potential (FCBP) must agree to ongoing pregnancy testing and to practice contraception. FCBP definition: A female of childbearing potential is a sexually mature woman who: 1) has not undergone a hysterectomy or bilateral oophorectomy; or 2) has not been naturally postmenopausal for at least 24 consecutive months Male subjects must agree to practice contraception for at least 90 days after the last dose of carfilzomib, and must agree not to donate sperm for at least 90 days after the last dose of carfilzomib Adequate bone marrow function Absolute neutrophil count ≥ 1.0 × 10^9/L Hemoglobin ≥ 8 g/dL (80 g/L) within 14 days prior Cycle 1, Day 1 (subjects may be receiving red blood cell (RBC) transfusions in accordance with institutional guidelines)  Progressive disease on bendamustine within 6 months of cycle 1, Day 1 Prior treatment with carfilzomib for lymphoma Patient has received other investigational drugs within 21 days prior to Cycle 1, Day 1. Exceptions allowed if greater than four half-lives of the experimental agent ) Prior radiation therapy or chemotherapy within 2 weeks prior Cycle 1, Day 1, monoclonal antibody therapy within 4 weeks Prior allogeneic transplant Active, uncontrolled central nervous system (CNS) involvement by lymphoma Pregnant or lactating females Major surgery within 14 days prior Cycle 1, Day 1 Acute active infection requiring treatment (systemic antibiotics, antivirals, or antifungals) within 14 days prior Cycle 1, Day 1 Known human immunodeficiency virus infection