Pattern of bone marrow involvement in non Hodgkin's lymphoma classified according to WHO classification: Report of a developing country Pakistan

BACKGROUND: Limited information is available from developing countries in patients of non-Hodgkin's lymphoma (NHL). Hence, we reviewed the demographical profile along with bone marrow infiltration pattern in patients with NHL presented at Liaquat National Hospital and Medical College. MATERIALS AND METHODS: In this descriptive study, adult patients with NHL were enrolled from January 2011 to December 2015. RESULTS: One hundred and Eighty-four histopathologically confirmed cases of NHL were identified. There were 139 males and 45 females, with a male-to-female ratio of 3:1. The mean age was 48.5 ± 16.0 years with the median age of 50 years. B-symptoms were present in 80.4% of patients. Lymph node enlargement was present in 71.1% of the cases. One hundred and sixty-eight patients had B-cell lymphoma (91.3%) and 16 patients had T-cell lymphoma (8.6%). Overall 158 (85.8%) patients had aggressive lymphoma. The frequency of bone marrow infiltration in our NHL patients was found to be 31.5%. Pattern of infiltrate was diffuse (14.6%) predominantly followed by interstitial (6.5%) and paratrabecular (5.4%) types of infiltration. The least common was nodular infiltrate accounted in 9 (4.8%) patients. CONCLUSIONS: B-cell lymphoma is more frequent than T-cell lymphoma. Younger age, aggressive lymphoma, and predominance of B-symptoms are more frequently seen. Diffuse bone marrow infiltration is more common in our set up probably because of a relatively late presentation in our patients.