Diffuse large B‑cell lymphoma of the thyroid: Seven cases with review of the literature from India

Background: Diffuse large B-cell lymphoma (DLBCL) is the most frequent subtype of nonHodgkin's lymphoma globally with frequent extra nodal involvement. There is sporadic data available on thyroid DLBCL in Indian population and hence we undertook this retrospective observational study at Kidwai Memorial Institute of Oncology, a tertiary care oncology center in India to analyze the clinico biological features of this disease. Methodology: A total of 7 consecutive cases diagnosed as DLBCL by appropriate lymph node biopsy with evidence of thyroid involvement on fine-needle aspiration cytology of thyroid or thyroid histopathology (following thyroidectomy) were confirmed by immunohistochemistry (WHO classification) between January 2008 and September 2013 were included in this study. Results: A total of 7 patients were included in the study. Median age was 65-years (range: 50-72 years), and all were females. Six out of seven were in stage IIAE and one was in stage IVAE. The distribution according to the international prognostic index was as follows: 3 were in low risk, 1 in low-intermediate, 2 in high-intermediate and 1 in high risk group. Regarding treatment, 5 received CHOP, 1 received COP and 1 received no treatment. 5 patients received radiotherapy. 2 patients underwent subtotal thyroidectomy. Of the 6 patients who received chemotherapy ΁ radiotherapy, 4 had complete response 1 was lost to follow-up at 3 months and 1 alive with no disease at 32 months), 2 had partial response. The median survival was 15 months (3-32 months). Conclusions: Extranodal thyroid DLBCL presents common in elderly age group and in females. A multimodality treatment approach is used to treat this entity and may improve survival compared with unimodality approach.