Pengaruh Sekretom Fibroblas dari Adenokarsinoma Kolorektal terhadap Sifat Kepuncaan Sel Lestari HT-29: Tinjauan pada Ekspresi STAT3, ALDH1A1, OCT4, dan MnSOD = The Effect of Fibroblast Secretome from Colorectal Adenocarcinoma on The Stemness of HT-29 Cell Line: Focus on STAT3, ALDH1A1, OCT4 and Mnsod Expression