title: Ki-1 antigen expression defines a favorable clinical subset of non-B cell non-Hodgkin's lymphoma.
abstract: Immunohistochemical and immunophenotypic analyses were performed on 278 cases of karyotypically abnormal non-Hodgkin's lymphoma (NHL). Excluding cases of lymphoblastic lymphoma or mycosis fungoides, 20 cases showed evidence of non-B cell lineage. T cell lineage was proven by genotypic and immunophenotypic analyses in 15 of the 20 cases; five were of ambiguous lineage. All of the non-B lineage cases were of diffuse histology with a large cell component (DLCL). Twelve cases expressed the Ki-1 antigen; five of these cases also demonstrated a translocation with a break at 5q35. Patients with Ki-1 positive DLCL and t(5q35) had a younger median age compared with non-B cell DLCL without t(5q35). The Ki-1 positive patients had a higher frequency of skin involvement and lower incidence of bone marrow involvement compared with Ki-1 negative DLCL. Survival analysis was performed on 86 cases of B cell DLCL and 18 cases of non-B cell DLCL which were serially ascertained prior to receiving cytotoxic chemotherapy. Median duration of complete remission was significantly longer in the B cell compared with the non-B cell DLCL groups; there was only a trend for decreased overall survival in the non-B cell group. Among the subset of non-B cell lymphomas, overall survival of patients with Ki-1 expressing DLCL was significantly longer than those with Ki-1 negative DLCL, who had a median survival of less than a year. These results show that immunophenotypic, immunohistochemical, and cytogenetic markers can define subsets of patients with non-B cell lymphomas with differing clinical characteristics and outcome.
authors.affiliation: Department of Pathology, Memorial Hospital, New York, New York.
authors.forename: K
authors.initials: K
authors.lastname: Offit
authors.forename: M
authors.initials: M
authors.lastname: Ladanyi
authors.forename: M D
authors.initials: MD
authors.lastname: Gangi
authors.forename: S A
authors.initials: SA
authors.lastname: Ebrahim
authors.forename: D
authors.initials: D
authors.lastname: Filippa
authors.forename: R S
authors.initials: RS
authors.lastname: Chaganti
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism*; D000943:Antigens, Differentiation / Q000032:analysis / Q000235:genetics / Q000378:metabolism*; D000951:Antigens, Neoplasm / Q000235:genetics / Q000378:metabolism*; D002648:Child; D002889:Chromosomes, Human, Pair 2; D002895:Chromosomes, Human, Pair 5; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D017730:Ki-1 Antigen; D008228:Lymphoma, Non-Hodgkin / Q000145:classification / Q000235:genetics / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D010641:Phenotype; D011379:Prognosis; D013601:T-Lymphocytes; D014178:Translocation, Genetic
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D000951:Antigens, Neoplasm; D017730:Ki-1 Antigen