Umhlaza wesisu kwenzeka xa kukho ukukhula okungaqhelekanga kweeseli esiswini. Ezi seli zingaqhelekanga ziyaqokelelana, zenze ithumba esiswini elinokuthi libe ne-metastasize (isasazeke) kwamanye amalungu omzimba.
Nangona unobangela womhlaza wesisu ungaqinisekanga, izinto ezahlukahlukeneyo zinokwandisa umngcipheko wokuba nesi sifo. Le miba yomngcipheko inokubandakanya:
Iimpawu zomhlaza wesisu zihlala zingachanekanga kwimihlaza yokuqala. Ezinye iimpawu ezinokuthi zenzeke zezi:
Iinketho zonyango lomhlaza wesisu
