Značaj imunohistokemijske izraženosti CD44 i Ki-67 u bolesnika s oralnom leukoplakijom

disertacija

• Naslov (engleski): The significance of immunohistochemical expression of CD44 and Ki-67 in patients with oral leukoplakia
• Autor: Ivona Žužul
• Mentor: Ana Andabak Rogulj (mentor)
• Mentor: Majda Vučić (komentor)
• Član povjerenstva: Vlaho Brailo (predsjednik povjerenstva)
• Član povjerenstva: Ivan Alajbeg (član povjerenstva)
• Član povjerenstva: Tihomir Kuna (član povjerenstva)
• Član povjerenstva: Mato Sušić (član povjerenstva)
• Član povjerenstva: Sven Seiwerth (član povjerenstva)
• Ustanova koja je dodijelila akademski / stručni stupanj: Sveučilište u Zagrebu; Stomatološki fakultet; (Zavod za oralnu medicinu); Zagreb
• Datum i država obrane: 2022-11-22, Hrvatska
• Znanstveno / umjetničko područje, polje i grana: BIOMEDICINA I ZDRAVSTVO; Dentalna medicina; Oralna medicina
• Univerzalna decimalna klasifikacija (UDC): 616 - Patologija. Klinička medicina

Sažetak

Oralna leukoplakija (OL) je potencijalno zloćudna lezija sluznice usne šupljine kod koje postoji povećan rizik za zloćudnu transformaciju u odnosu na zdravu sluznicu. Razumijevanje procesa karcinogeneze i razvoj molekularne biologije doveo je do otkrivanja novih molekularnih biomarkera poput Ki67 i CD44 koji bi mogli pomoći u ranom otkivanju tumora te njihovom
liječenju. Cilj ovog retrospektivnog presječnog istraživanja je imunohistokemijski utvrditi izraženost CD44 i Ki67 u OL te usporediti dobivene podatke s izraženosti CD44 i Ki67 u oralnom planocelularnom karcinomu (OPK) i zdravoj oralnoj sluznici, kako bi se iz obrazaca njihovih pojavnosti pretpostavila uključenost u patološke događaje, a što bi moguće indiciralo
potrebu za prospektivnim studijama koje uključuju i ishode. Analizirano je 30 uzoraka sluznice usne šupljine s dijagnozom OL, 30 uzoraka sluznice usne šupljine s dijagnozom OPK i 20 uzoraka sluznice usne šupljine bez patohistoloških promjena.
Imunohistokemijska analiza za protutijela vodila se LSAB metodom kao vizualizacijskim sistemom na Dako TechMate TM Horizon (Dako, Copenhagen, Danska) automatiziranom stroju za imunohistokemijsko bojenje. Zabilježena je značajna razlika između ispitivanih skupina u odnosu na izraženost CD44 u epitelu kao i u odnosu na izraženost Ki67 u epitelu.
Statistički značajna razlika zabilježena je između ispitivanih skupina u odnosu na imunohistokemijsku izraženost CD44 u upalnom infiltratu, dok je značajna razlika s obzirom na izraženost Ki67 u upalnom infiltratu zabilježena između skupine OPK i OL te OPK i zdrave sluznice, ali ne i između OL i zdrave sluznice. Pozitivna korelacija zabilježena je između upale detektirane na hematoksilin eozinskom preparatu (HE) i Ki67 u upalnom infiltratu u skupini OL. Značajne i pozitivne korelacije zabilježene su i s CD44 i u epitelu i u upalnom infiltratu iste skupine. Nije zabilježena značajna korelacija između upale HE i ispitivanih molekularnih biljega u skupini OPK. Značajna pozitivna korelacija zabilježena je između CD44 u upalnom infiltratu s CD44 i Ki67 u epitelu, ali samo u skupini OL, dok za OPK nije bilo značajne povezanosti. Povećana imunohistokemijska izraženost biljega CD44 i Ki67 u OL upućuje na potrebu provođenja novih opsežnijih studija koje bi omogućile kliničarima dodatne mogućnosti
praćenja i predviđanja ponašanja pojedinih lezija.

Sažetak (engleski)

INTRODUCTION: Oral leukoplakia (OL) is a potentially malignant lesion of the oral mucosa in which there is an increased risk of malignant transformation compared to healthy mucosa. Today, many clinical, histopathological, and molecular factors are used as potential predictors of malignant transformation. Overall, conventional histopathological assessment remains the golden standard to determine malignancy in such cases. However, the assessment of dysplasia is subjective and for an accurate histopathological assessment experience is necessary. Understanding the process of carcinogenesis and the development of molecular biology has led to the discovery of new molecular biomarkers such as Ki67 and CD44 that could help in the early detection of tumors and their treatment.
AIM OF THE RESEARCH: The aim of the research to immunohistochemically determine the presence of CD44 and Ki67 in OL and to compare the obtained data with the presence of CD44 and Ki67 in the oral squamous cell carcinoma (OSCC) and healthy oral mucosa.
METHODS: 30 samples of oral mucosa diagnosed with OL, 30 samples of oral mucosa diagnosed with OSCC and 20 samples of oral mucosa without pathohistological changes analyzed. Sections of paraffin blocks and primary monoclonal antibodies to Ki67 (MO A-HU Ki67, clone MIB-1, 1: 150, DAKO) and to CD44 (MO A-HU CD44, clone DF 1485, 1:50,
DAKO) used for immunohistochemical analysis. Immunohistochemical analysis for antibodies performed using the LSAB method as a visualization system on a Dako TechMateTM Horizon (Dako, Copenhagen, Denmark) automated machine for immunohistochemical staining.
RESULTS: In the group diagnosed with OSCC, significantly more men compared to the OL groups and healthy oral mucosa were detected. The OSCC group was the oldest with a median age of 66.5 (IQR 52.2–72.0) years. A significant difference was noticed considering the presence of inflammation between the OL and OSCC group in regard to healthy mucosa, while no difference between the OL and OSCC group were observed. The inflammatory infiltrate described on hemalaun eosin (HE) in the stroma correlated with the presence of Ki67 in the inflammatory infiltrate in the stroma. Significant difference between the examined groups in relation to the presence of CD44 in the epithelium as well as in relation to the presence of Ki67 in the epithelium were observed. A statistically significant difference between the examined
groups in relation to the CD44 in inflammatory infiltrate was observed, while a significant difference in terms of Ki67 in inflammatory infiltrate between OSCC and OL and OSCC and healthy mucosa, but not between OL and healthy mucosa were detected. A positive correlation between HE and Ki67 in the inflammatory infiltrate in the OL group were observed. Significant and positive correlations between HE inflammatory infiltrate and CD44 both in the epithelium and in the inflammatory infiltrate of the same group were observed. No significant correlation between HE inflammation and the examined molecular markers in the OSCC group was observed. A significant positive correlation between CD44 in inflammatory infiltrate with CD44 and Ki67 in the epithelium was observed, but only in the OL group, whereas no
significant connection for OSCC was observed.
CONCLUSION: An increased immunohistochemical presence of CD44 and Ki67 markers in OL suggests the need for new more extensive studies that would provide clinicians additional options for monitoring and predicting the behavior of individual lesions.

• Ključne riječi: oralna leukoplakija; oralne novotvorine; skvamozne stanice; biomarkeri; Ki-67 antigen; hijaluronski receptori
• Ključne riječi (engleski): Oral Leukoplakia; Mouth Neoplasms; Neoplasms; Squamous Cell; Biomarkers; *Ki-67 Antigen; *Hyaluronan Receptors
• Jezik: hrvatski
• URN:NBN: urn:nbn:hr:127:704509
• Datum promocije: 2022
• Studijski program: Naziv: Dentalna medicina; Vrsta studija: sveučilišni; Stupanj studija: poslijediplomski doktorski; Akademski / stručni naziv: doktor/doktorica znanosti, područje biomedicine i zdravstvo, polje dentalna medicina (dr.sc.)
• Vrsta resursa: Tekst
• Način izrade datoteke: Izvorno digitalna
• Prava pristupa: Otvoreni pristup
• Datum i vrijeme pohrane: 2022-02-01 12:27:30