title: The development of more than one histologic type of lymphoma in the same patient is frequent and confers a worse prognosis.
authors.affiliation: Lymphoma Study Group, Institute of Haematology and Clinical Oncology, Bologna University, Italy. pileri@med.unibo.it.
authors.forename: Stefano A
authors.initials: SA
authors.lastname: Pileri
authors.forename: Pier Paolo
authors.initials: PP
authors.lastname: Piccaluga
authors.forename: Elena
authors.initials: E
authors.lastname: Sabattini
authors.forename: Pier Luigi
authors.initials: PL
authors.lastname: Zinzani
mesh_terms: D006801:Humans; D015994:Incidence; D008223:Lymphoma / Q000175:diagnosis / Q000473:pathology*; D016609:Neoplasms, Second Primary / Q000473:pathology; D011379:Prognosis