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Określenie stopnia zaawansowania klinicznego nowotworu
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Wyszukaj w serwisie


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Określenie stopnia zaawansowania klinicznego nowotworu i klasyfikacja TNM


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WWP_7_8_18_OKRESLENIE_STOPNIA_ZAAWANSOWANIA_KLINICZNEGO_ONKOLOGIA_PSOW_I_KOTOW

Przedruk fragmentu rozdziału 3. książki
Onkologia psów i kotów. Wyd. Galaktyka, 2018.

Cechy złośliwości

Klinicznie najważniejszą cechą nowotworu złośliwego jest jego zdolność do naciekowego wzrostu i dawania przerzutów (ryc. 3.3). Oba te procesy są ze sobą mocno powiązane, ponieważ w wielu przypadkach naciekanie tkanek prawidłowych jest pierwszym etapem powstawania ognisk przerzutowych. Naciekanie i przerzutowanie są bardzo złożonymi procesami, których podłoże biochemiczne i genetyczne ciągle jeszcze nie zostało w pełni poznane. Wiadomo, że w obydwa procesy zaangażowane są cząsteczki adhezyjne uczestniczące w oddziaływaniach międzykomórkowych (w szczególności należące do rodziny kadheryn) oraz integryny (łączące komórki z macierzą pozakomórkową), ponieważ dochodzi do przebudowy składników macierzy komórkowej i ich proteolitycznej degradacji, co pozwala komórkom nowotworowym na pokonanie bariery, jaką stanowi dla nich tkanka łączna.

WWP_7_8_18_OKRESLENIE_STOPNIA_ZAAWANSOWANIA_KLINICZNEGO_RYC_3_3
Ryc. 3.3. Inwazyjność i przerzutowanie

Naciekanie tkanek

Z klinicznego punktu widzenia naciekanie ścian narządów rurowych lub otaczających tkanek przez komórki nowotworowe warunkuje rozległość marginesów chirurgicznych, które trzeba zachować, aby uzyskać całkowitą resekcję guza, a zatem determinuje możliwość wyleczenia nowotworu drogą chirurgiczną (ryc. 3.4).

Niestety w warunkach klinicznych bardzo trudno jest oszacować inwazyjność poszczególnych guzów przed ich chirurgicznym usunięciem. W praktyce lekarz [...]

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Mogą zainteresować Cię również


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Wizytówka firmy


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Sklep


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