Clustering of non-Hodgkin's lymphomas. A case study

Lymphomas developed in three genetically unrelated family members living in the same household over a period of one year. Two of the patients had diffuse histiocytic lymphoma, and one had nodular lymphocytic lymphoma. All three showed response to treatment initially, but two have had relapses and died. The "clustering" of lymphomas in this family suggests an environmental cause.