Prognostičko značenje izražaja gena za citokeratin-20 u stanicama periferne krvi bolesnika s rakom debeloga crijeva [Cytokeratin-20 positive cells in blood of colorectal cancer patients as a prognostic marker]

Kust, Davor (2016) Prognostičko značenje izražaja gena za citokeratin-20 u stanicama periferne krvi bolesnika s rakom debeloga crijeva [Cytokeratin-20 positive cells in blood of colorectal cancer patients as a prognostic marker]. PhD thesis, Sveučilište u Zagrebu.

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Abstract

Cytokeratin 20 (CK20) is one of the most investigated markers for the detection of circulating cancer cells. Detection of circulating cancer cells by reverse transcription polymerase chain reaction (RT-PCR) was studied as prognostic marker in colorectal cancer patients in several studies, but so far with conflicting results regarding its prognostic value. Primary aim of this study was to evaluate prognostic value of RTPCR detection of circulating colorectal cancer cells using CK20 as a marker. Ribonucleic acid (RNA) was isolated from mononuclear cell fraction of blood samples taken from 95 colorectal cancer patients before and after tumor resection, and from 23 healthy volunteers, and assayed by real-time RT-PCR for CK20 expression. Among 23 healthy volunteers, seven were positive for CK20. Among 95 colorectal cancer patients, 69 were positive for CK20 before, and 74 after surgery. Fifteen patients positive before surgery became negative after surgery, while 20 patients negative before surgery became positive after surgery. Increase in the proportion of CK20 positive samples with increasing stage of disease was observed for postoperative, but not for preoperative blood samples. In patients positive for CK20 postoperatively, both progression-free survival (PFS) and overall survival (OS) were statistically significantly shorter in comparison to patients negative for CK20 postoperatively and difference between patients CK20 positive and negative preoperatively was not statistically significant in terms neither PFS nor OS. Our results have shown that CK20 as marker for detection of circulating cancer cells has a prognostic value in colorectal cancer patients. In cases where multiple treatment options are possible, patients with positive postoperative CK20 expression could be candidates for more aggressive treatment.

Abstract in Croatian

Citokeratin 20 (CK20) jedan je od najistraživanijih biljega za detekciju cirkulirajućih tumorskih stanica. Detekcija cirkulirajućih tumorskih stanica pomoću lančane reakcije polimerazom nakon reverzne transkripcije (RT-PCR) istraživana je kao prognostički biljeg u bolesnika oboljelih od raka debelog crijeva u nekoliko studija, ali za sada s oprečnim rezultatima u pogledu prognostičke vrijednosti. Osnovni cilj ovog istraživanja bio je odrediti prognostičku vrijednost detekcije cirkulirajućih stanica metodom RT-PCR za biljeg CK20. Ribonukleinska kiselina (RNA) je izolirana iz mononuklearne frakcije uzoraka krvi dobivenih od 95 bolesnika s rakom deblog crijeva prije i nakon operativnog zahvata te od 23 zdrava dobrovoljca. Izražaj CK20 određen je metodom RT-PCR u stvarnom vremenu. Među 23 zdrava dobrovoljca, sedam ih je bilo pozitivno na CK20. Među 95 bolesnika oboljelih od kolorektalnog karcinoma, 69 ih je bilo pozitivno na CK20 prije, a 74 nakon operacije. Petnaest bolesnika pozitivnih prije operacije postalo je negativno nakon zahvata, dok je 20 bolesnika koji su preoperativno bili CK20 negativni postalo pozitivno postoperativno. Povećan udio CK20 pozitivnih uzoraka u višim stadijima bolesti uočen je kod postoperativnih, ali ne i preoperativnih uzoraka krvi. Bolesnici koji su postoperativno bili CK20 pozitivni imali su statistički značajano kraće vrijeme do progresije bolesti (PFS) i ukupno preživljenje (OS) u usporedbi s bolesnicima negativnima na CK20 postoperativno, dok razlika između CK20 pozitivnih i negativnih bolesnika preoperativno nije bila statistički značajna u pogledu PFS-a i OS-a. Navedeni rezultati pokazuju da CK20 kao biljeg cirkulirajućih stanica raka ima prognostičku vrijednost u bolesnika oboljelih od kolorektalnog karcinoma. U slučajevima kada je prisutno više mogućih terapijskih opcija, bolesnici s pozitivnim postoperativnim izražajem CK20 bi mogli biti kandidati za agresivnije liječenje.

Item Type: Thesis (PhD)
Mentors:
Mentor
Šamija, Ivan
Departments: Izvan medicinskog fakulteta
Depositing User: dr.med. Helena Markulin
University: Sveučilište u Zagrebu
Institution: Medicinski fakultet
Number of Pages: 102
Status: Unpublished
Creators:
CreatorsEmail
Kust, DavorUNSPECIFIED
Date: 5 July 2016
Date Deposited: 05 Sep 2018 09:50
Last Modified: 05 Sep 2018 09:51
Subjects: /
Related URLs:
    URI: http://medlib.mef.hr/id/eprint/2991

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