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Comparison of the value of PCNA and Ki-67 as markers of cell proliferation in ameloblastic tumors

2012; Medicina Oral S.L.; Linguagem: Inglês

10.4317/medoral.18573

1698-6946

Ronell Bologna‐Molina, Adalberto Mosqueda‐Taylor, Nelly Molina‐Frechero, AD. Mori-Estevez, G. Sanchez-Acuna,

Salivary Gland Tumors Diagnosis and Treatment

Objectives: The aim of this study was to compare among PCNAand Ki-67 as the most reliable immunohistochemical marker for evaluating cell proliferation in ameloblastic tumors.Study Design: Observational, retrospective, and descriptive study of a large series of ameloblastic tumors, com-Design: Observational, retrospective, and descriptive study of a large series of ameloblastic tumors, com-esign: Observational, retrospective, and descriptive study of a large series of ameloblastic tumors, composed of 161 ameloblastomas and four ameloblastic carcinomas, to determine and compare PCNA and Ki-67 expression using immunohistochemistry techniques.Results: When analyzing Ki-67 positivity, the desmoplastic ameloblastoma demonstrated a significantly lower proliferation rate (1.9%) compared with the solid/multicystic and unicystic ameloblastomas and ameloblastic carcinomas (p<0.05),whereas the ameloblastic carcinomas displayed a significantly higher rate compared with all of the other ameloblastomas (48.7%) (p<0.05).When analyzing cell proliferation with PCNA, we found significant differences only between the ameloblastic carcinomas (93.3%) and the desmoplastic ameloblastomas (p<0.05).When differences between the immunopositivity for PCNA and Ki-67 were compared, the percentages were higher for PCNA in all types of ameloblastomas and ameloblastic carcinomas.In all cases, the percentages were greater than 80%, whereas the immunopositivity for Ki-67 was significantly lower; for example, the ameloblastic carcinoma expressed the highest positivity and only reached 48.7%, compared to 93.3% when we used PCNA.Conclusions: In the present study, when we used the proliferation cell marker Ki-67, the percentages of positivity were more specific and varied among the different types of ameloblastomas, suggesting that Ki-67 is a more specific marker for the proliferation of ameloblastic tumor cells.