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1.
Peripheral blood transcriptome in breast cancer patients as a source of less invasive immune biomarkers for personalized medicine, and implications for triple negative breast cancer
Helena Sabina Čelešnik, Uroš Potočnik, 2022, review article

Abstract: Transcriptome studies of peripheral blood cells can advance our understanding of the systemic immune response to the presence of cancer and the mechanisms underlying cancer onset and progression. This enables the identification of novel minimally invasive immune biomarkers for early cancer detection and personalized cancer management and may bring forward new immunotherapy options. Recent blood gene expression analyses in breast cancer (BC) identified distinct patient subtypes that differed in the immune reaction to cancer and were distinct from the clinical BC subtypes, which are categorized based on expression of specific receptors on tumor cells. Introducing new BC subtypes based on peripheral blood gene expression profiles may be appropriate, since it may assist in BC prognosis, the identification of patients likely to benefit from immunotherapy, and treatment efficacy monitoring. Triple-negative breast cancer (TNBC) is an aggressive, heterogeneous, and difficult-to-treat disease, and identification of novel biomarkers for this BC is crucial for clinical decision-making. A few studies have reported TNBC-enriched blood transcriptional signatures, mostly related to strong inflammation and augmentation of altered immune signaling, that can differentiate TNBC from other classical BC subtypes and facilitate diagnosis. Future research is geared toward transitioning from expression signatures in unfractionated blood cells to those in immune cell subpopulations.
Keywords: triple negative breast cancer, transcriptome, peripheral blood, PBMC, gene expression, immune biomarker
Published in DKUM: 23.08.2023; Views: 227; Downloads: 18
.pdf Full text (1,74 MB)
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2.
Validacija klinično pomembnih transkripcijskih biooznačevalcev v krvnih vzorcih pred in po zdravljenju trojno negativnega raka dojke : magistrsko delo
Anja Konajzler, 2022, master's thesis

Abstract: Rak dojke (RD) je najpogostejši rak pri ženskah in drugi najpogostejši vzrok smrti zaradi raka pri ženskah. Gre za maligno obolenje, ki izvira iz tkiva dojke, najpogosteje iz notranje obloge mlečnih vodov ali režnjev, ki vode oskrbujejo z mlekom. Eden izmed podtipov raka dojke je trojno negativni rak dojke (TNRD), za katerega je značilno, da nima ekspresije ER in PR in nima amplifikacije HER2, ter da je zelo invaziven in povezan s slabo prognozo in visoko umrljivostjo. Spremenjeno izražanje genov CXCR4, THBS1 in miR-137 so predhodno povezali s TNRD. Namen naše študije je bil testirati in validirati njihovo uporabnost kot potencialni krvni biomarkerji za trojno negativni rak dojke. V primerjavi s tkivnimi označevalci imajo krvni biološki označevalci pomembno prednost, da so manj invazivni. Iz 210 vzorcev mononuklearnih celic periferne krvi (PBMC) odvzetih bolnicam z rakom dojke pred zdravljenjem, 28 vzorcev plazme (13 pred zdravljenjem, 15 po zdravljenju) ter 25 vzorcev krvnih PBMC zdravih kontrol smo izolirali RNA za analizo izražanja genov z metodo RT-qPCR. Plazemski vzorci pred in po zdravljenju TNRD so bili zanimivi s stališča spremljanja terapije. Analiza izražanja CXCR4 v imunskih celicah PBMC je pri pacientkah z rakom dojke pred terapijo odkrila zanimive rezultate. Izražanje CXCR4 je bilo značilno povišano pri tistih bolnicah, ki so imele invazivni duktalni karcinom (IDC), v primerjavi s tistimi, ki so imele invazivni lobularni karcinom (ILC). To nakazuje na potencialno uporabnost merjenja izražanja CXCR4 v krvi kot označevalca za IDC. Ugotovili smo tudi, da imajo pacientke, pri katerih rakave celice izražajo PR, značilno povečano izražanje CXCR4 v krvnih imunskih celicah. Teh izsledkov nismo zasledili v objavljeni literaturi in predstavljajo nove ugotovitve pri raku dojke. Analiza THBS1 v frakciji PBMC pacientk z rakom dojke pred terapijo je pokazala povišano izražanje tega gena v skupini TNRD v primerjavi z ostalimi podtipi raka dojke in zdravimi kontrolami, vendar v naši kohorti razlika v izražanju ni dosegla statistične signifikance. Pri analizi prekurzorske oblike miR-137 v plazmi pred in po terapiji smo naleteli na tehnične težave, zato bo za to analizo potrebna dodatna optimizacija postopka.
Keywords: rak dojk, TNRD, PBMC, CXCR4, THBS1, miR-137, genska ekspresija
Published in DKUM: 26.09.2022; Views: 462; Downloads: 45
.pdf Full text (3,60 MB)

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