The advent of comprehensive genomic profiling using next-generation sequencing (NGS) has unveiled an abundance of potentially actionable genetic aberrations that have shaped our understanding of the cancer biology landscape. Isocitrate dehydrogenase (IDH) is an enzyme present in the cytosol (IDH1) and mitochondria (IDH2 and IDH3). In the mitochondrion, it catalyzes the irreversible oxidative decarboxylation of isocitrate, yielding the production of α-ketoglutarate and nicotinamide adenine dinucleotide phosphate (NADPH) as well as carbon dioxide (CO₂). In the cytosol, IDH catalyzes the decarboxylation of isocitrate to α-ketoglutarate as well as the reverse reductive carboxylation of α-ketoglutarate to isocitrate. These rate-limiting steps in the tricarboxylic acid cycle, as well as the cytoplasmic response to oxidative stress, play key roles in gene regulation, cell differentiation, and tissue homeostasis. Mutations in the genes encoding IDH1 and IDH2 and, less commonly, IDH3 have been found in a variety of cancers, most commonly glioma, acute myeloid leukemia (AML), chondrosarcoma, and intrahepatic cholangiocarcinoma. In this paper, we intend to elucidate the theorized pathophysiology behind IDH isomer mutation, its implication in cancer manifestation, and discuss some of the available clinical data regarding the use of novel IDH inhibitors and their role in therapy.

Non-Hodgkin lymphomas (NHLs) represent a diverse group of hematologic malignancies derived from various cells. B-cell NHLs represent the largest fraction of lymphomas diagnosed and treated in the United States. Standard chemo-immunotherapies with rituximab and multiagent cytotoxic regimens have proven to be effective in the management of these lymphoproliferative neoplasms; nonetheless, a considerable fraction of patients still experience relapse or have treatment-refractory disease. Therapeutic advances using novel immunotherapeutic agents as well as cell-based treatments, such as chimeric antigen receptor (CAR) T-cell therapies, have improved the outcomes of relapsed/refractory (R/R) B-cell NHL. Most of these new treatment strategies are not curative and most patients succumb to R/R disease, leaving this population with an unmet need for effective and well-tolerated therapeutic options. One of these up-and-coming options are bispecific antibodies (BsAb), either as single agent or in combination with other medications. Conclusion: BsAbs offer a novel “off the shelf” chemotherapy-free approach in the management of R/R B-cell NHL. Advancements in antibody construct design along with improved safety profile and clinical effectiveness of the most recent BsAbs suggest that these agents are a promising new option in the management of R/R B-cell NHL.