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Extranodal NK/T-cell lymphoma, nasal type — Clinical Guidelines

Overview

Extranodal NK/T-cell lymphoma, nasal type (ENKTL) is an aggressive form of non-Hodgkin lymphoma characterized by extranodal involvement, often affecting the upper aerodigestive tract and midline facial structures, including the nasal cavity and tonsils 1 4 5.

Diagnosis

Clinical Presentation: Extranodal ulcerative lesions, particularly in the upper aerodigestive tract and midline facial structures 1 4 6.

Biopsy and Immunohistochemistry: Essential for diagnosis; positive for CD2, CD56, and cytotoxic granule proteins like TIA-1, perforin, and granzyme B 1 7.

Imaging: Enhanced CT scans can show characteristic calcifications and tumor extent 1.

Differential Diagnosis: Includes pyogenic granulomatous inflammation, actinomycosis, and other granulomatous diseases 4 6.

Management

First-Line Treatment: Combined modality approach including chemotherapy (e.g., SMILE regimen: dexamethasone, methotrexate, ifosfamide, L-asparaginase, and etoposide) 1.

Radiation Therapy: Critical component, especially in early-stage disease; involves risk-adapted therapy with extended clinical target volumes to account for submucosal infiltration 2.

Allogeneic Hematopoietic Stem Cell Transplantation (allo-HSCT): Considered for high-risk or relapsed cases due to potential curative GVL effect, though associated with significant morbidity including GVHD 3.

Special Populations

Pediatrics: Early diagnosis is crucial; ENKTL can present atypically with nonspecific symptoms like sore throat and tonsillar hypertrophy 1 5.

Comorbidities: Insulin-dependent diabetes may complicate presentation and prognosis, as seen in a fatal case 4.

Key Recommendations

Early Combined Modality Therapy: Initiate treatment with chemotherapy and radiation therapy for optimal outcomes (Evidence: Moderate 1 2).

Risk-Adapted Radiation Therapy: Tailor radiation volumes and doses based on disease extent and risk stratification (Evidence: Moderate 2).

Consider Allo-HSCT for High-Risk Patients: Evaluate allogeneic hematopoietic stem cell transplantation for high-risk or refractory cases despite increased risk of GVHD (Evidence: Weak 3).

References

1 Xiao Y, Zhang X, Gao Y, Lin K, Chi W, Zhou K et al.. Extranodal natural killer/T-cell lymphoma with tonsil involvement: a case report. BMC oral health 2024. link 2 Qi SN, Li YX, Specht L, Oguchi M, Tsang R, Ng A et al.. Modern Radiation Therapy for Extranodal Nasal-Type NK/T-cell Lymphoma: Risk-Adapted Therapy, Target Volume, and Dose Guidelines from the International Lymphoma Radiation Oncology Group. International journal of radiation oncology, biology, physics 2021. link 3 Peng YY, Xiong YY, Zhang LX, Wang J, Zhang HB, Xiao Q et al.. Allogeneic Hematopoietic Stem Cell Transplantation in Extranodal Natural Killer/T-cell Lymphoma. Turkish journal of haematology : official journal of Turkish Society of Haematology 2021. link 4 Taali L, Abou-Elfadl M, Fassih M, Mahtar M. Nasal NK/T-cell lymphoma: A tragic case. European annals of otorhinolaryngology, head and neck diseases 2017. link 5 Lee JY, Jang YD, Kim HK. The primary role of the otolaryngologist in managing pediatric sinonasal malignancies: an extranodal NK/T-cell lymphoma originating from the inferior turbinate mucosa of the nasal cavity. Journal of pediatric hematology/oncology 2008. link 6 Reinartz SM, Schot LJ, Riedl RG, Oldenburger F, van den Brekel MW. Presentation of two cases of nasal type NK/T-cell lymphoma. European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery 2007. link 7 Takeshita M, Yamamoto M, Kikuchi M, Kimura N, Nakayama J, Uike N et al.. Angiodestruction and tissue necrosis of skin-involving CD56+ NK/T-cell lymphoma are influenced by expression of cell adhesion molecules and cytotoxic granule and apoptosis-related proteins. American journal of clinical pathology 2000. link

Extranodal NK/T-cell lymphoma, nasal type