The Finnish lymphoma families in the lymphoma study. Family 1: the previously reported Finnish family where four cousins have had the rare subtype of Hodgin lymphoma (HL), nodular lymphocyte predominant Hodgkin lymphoma (NLPHL), in their early twenties. Family 2 and family 3: the lymphoma families from northern Finland that have a common ancestor. The patients and unaffected family members from whom genome-wide SNP data were available for haplotype determination and Haplous analysis are depicted. Numbers within diamonds indicate numbers of children. Circles, females; squares, males; slashes through symbols, deceased. Pedigrees have been slightly modified for confidentiality.