[Two cases of discordant lymphomas consisting of MALT lymphoma and follicular lymphoma].

We report here rare cases of discordant lymphoma consisting of MALT lymphoma and follicular lymphoma. Case 1: A 53-year-old woman was diagnosed with MALT lymphoma of the left parotid gland and follicular lymphoma of the duodenum and small intestine. Case 2: A 38-year-old woman was diagnosed with MALT lymphoma of the intestine and follicular lymphoma of the duodenum and bone marrow. Recently, it has been suggested that duodenal follicular lymphoma has intermediate characteristics of nodal follicular lymphoma and MALT lymphoma. It is interesting that both of these cases demonstrated duodenal follicular lymphoma. These cases suggest that MALT lymphoma and duodenal follicular lymphoma share some common pathological condition.

[Successful treatment with low-dose dasatinib in a patient with chronic eosinophilic leukemia intolerant to imatinib].

A 77-year-old man with cough and dyspnea was admitted to hospital. Chest X-ray demonstrated reticulated shadows in the bilateral inferior lung fields and marked eosinophilia was detected in peripheral blood. Although he received steroid pulse therapy, eosinophilia became more serious and he was referred to our hospital. Bone marrow examination demonstrated a hypercellular marrow that consisted predominantly of dysplastic eosinophils with differentiation. FISH analysis of bone marrow cells demonstrated 4q12 deletion and RT-PCR analysis detected FIP1L1-PDGFRA fusion gene, leading to the diagnosis of chronic eosinophilic leukemia (CEL). Treatment with low-dose imatinib was immediately initiated; however, drug-induced systemic edema was progressive and became intolerable. Therefore, we changed imatinib to low-dose dasatinib (20 mg/day), resulting in complete molecular response of CEL after 3 months without any severe adverse effects. This is the first report on the efficacy of low-dose dasatinib for the treatment of CEL. The peak level (Cmax) of dasatinib in this patient was 55.3 nM, which exceeded the concentration of dasatinib required to inhibit cells with FIP1L1-PDGFRA by 50%. Thus, low-dose dasatinib with therapeutic drug monitoring can be a useful therapy for imatinib-intolerant CEL even in elderly patients.