Survival outcomes of patients with histiocytic neoplasms are poor, with no standard-of-care treatments available for these malignancies. Recent characterization of the genomic landscape of various histiocytic neoplasms have shown a predominance of activating driver mutations within the MAPK/ERK pathway (ie, BRAF, MEK, KRAS, MAPK, and NRAS). Subsequently, successful treatment of these malignancies with BRAF and MEK inhibitors has been reported. This report presents the first patient with histiocytic sarcoma harboring a somatic KRAS Q61H mutation who was subsequently treated to a near complete response with the MEK inhibitor trametinib. Due to patient preference, lack of standard of care treatments, and associated morbidity from head and neck dissection, initial disease reduction provided by trametinib therapy allowed for a less morbid resection. This case report highlights the utility of up-front next-generation sequencing and the efficacy of MEK inhibition in patients with histiocytic sarcoma harboring activating KRAS mutations.
Boyu Hu, Jay L. Patel, Randa Tao, Richard B. Cannon, Marcus Monroe, and Gaurav Goyal
Featured Updates to the NCCN Guidelines
Steven M. Horwitz, Stephen Ansell, Weiyun Z. Ai, Jeffrey Barnes, Stefan K. Barta, Mark W. Clemens, Ahmet Dogan, Aaron M. Goodman, Gaurav Goyal, Joan Guitart, Ahmad Halwani, Bradley M. Haverkos, Richard T. Hoppe, Eric Jacobsen, Deepa Jagadeesh, Allison Jones, Youn H. Kim, Neha Mehta-Shah, Elise A. Olsen, Barbara Pro, Saurabh A. Rajguru, Sima Rozati, Jonathan Said, Aaron Shaver, Andrei Shustov, Lubomir Sokol, Pallawi Torka, Carlos Torres-Cabala, Ryan Wilcox, Basem M. William, Jasmine Zain, Mary A. Dwyer, and Hema Sundar
Hepatosplenic T-cell lymphoma (HSTCL) is a rare subtype of T-cell lymphoma associated with an aggressive clinical course and a worse prognosis. HSTCL develops in the setting of chronic immune suppression or immune dysregulation in up to 20% of cases and is most often characterized by spleen, liver, and bone marrow involvement. Diagnosis and management of HSTCL pose significant challenges given the rarity of the disease along with the absence of lymphadenopathy and poor outcome with conventional chemotherapy regimens. These Guidelines Insights focus on the diagnosis and treatment of HSTCL as outlined in the NCCN Guidelines for T-Cell Lymphomas.
Ronald S. Go, Eric Jacobsen, Robert Baiocchi, Ilia Buhtoiarov, Erin B. Butler, Patrick K. Campbell, Don W. Coulter, Eli Diamond, Aron Flagg, Aaron M. Goodman, Gaurav Goyal, Dita Gratzinger, Paul C. Hendrie, Meghan Higman, Michael D. Hogarty, Filip Janku, Reem Karmali, David Morgan, Anne C. Raldow, Alexandra Stefanovic, Srinivas K. Tantravahi, Kelly Walkovich, Ling Zhang, Mary Anne Bergman, and Susan D. Darlow
Histiocytic neoplasms are rare hematologic disorders accounting for less than 1% of cancers of the soft tissue and lymph nodes. Clinical presentation and prognosis of these disorders can be highly variable, leading to challenges for diagnosis and optimal management of these patients. Treatment often consists of systemic therapy, and recent studies support use of targeted therapies for patients with these disorders. Observation (“watch and wait”) may be sufficient for select patients with mild disease. These NCCN Guidelines for Histiocytic Neoplasms include recommendations for diagnosis and treatment of adults with the most common histiocytic disorders: Langerhans cell histiocytosis, Erdheim-Chester disease, and Rosai-Dorfman disease.
Featured Updates to the NCCN Guidelines
Neha Mehta-Shah, Steven M. Horwitz, Stephen Ansell, Weiyun Z. Ai, Jeffrey Barnes, Stefan K. Barta, Mark W. Clemens, Ahmet Dogan, Kristopher Fisher, Aaron M. Goodman, Gaurav Goyal, Joan Guitart, Ahmad Halwani, Bradley M. Haverkos, Richard T. Hoppe, Eric Jacobsen, Deepa Jagadeesh, Matthew A. Lunning, Amitkumar Mehta, Elise A. Olsen, Barbara Pro, Saurabh A. Rajguru, Satish Shanbhag, Aaron Shaver, Andrei Shustov, Lubomir Sokol, Pallawi Torka, Carlos Torres-Cabala, Ryan Wilcox, Basem M. William, Jasmine Zain, Mary A. Dwyer, Hema Sundar, and Youn H. Kim
Mycosis fungoides (MF) is the most common subtype of cutaneous T-cell lymphoma (CTCL), and Sézary syndrome (SS) is a rare erythrodermic and leukemic subtype of CTCL characterized by significant blood involvement. Although early-stage disease can be effectively treated predominantly with skin-directed therapies, systemic therapy is often necessary for the treatment of advanced-stage disease. Systemic therapy options have evolved in recent years with the approval of novel agents such as romidepsin, brentuximab vedotin, and mogamulizumab. These NCCN Guidelines Insights discuss the diagnosis and management of MF and SS (with a focus on systemic therapy).