Potential use of absorbance scanning in differentiating tumor microenvironment compositions from endoscopic biopsy of colorectal cancer patients.

Background: The microtumor environment is an area where tumor cells are surrounded by several cells such as immune cells, stromal cells and endothelial cells as well as blood and lymphatic vessels. It is known that various cytokines and growth factors are released by various cells surrounding the tumor and affect the growth of tumor cells. Differences in chemical composition in the microtumor environment can be detected using spectrometry. The aim of this study was to examine the potential of scanning absorbance spectrometry in differentiating cells based on the chemical composition of endoscopic biopsies of colorectal cancer patients. Methods: An endoscopic biopsy of the patient from Cipto Mangunkusumo Hospital, Jakarta was collected and homogenized in phosphate buffer saline using TissueLyser. Scanning absorbance was performed using a UV-VIS spectrophotometer. The results of scanning absorbance were then processed using principal component analysis (PCA) in Orange Data-Mining version 3.28.0 software and the results were represented in a scatter plot diagram. Results: Based on the results of the analysis using PCA, three patients were identified in different quadrant regions, crc006 and crc011 obtained from patients with the differentiation status located close together while crc009 and undifferentiated were located far apart. Conclusion: This indicates the potential of scanning absorbance in differentiating the chemical composition of the tumor microenvironment from patient biopsies.