Our data on detailing metastasis localization and subtype characteristics in metastatic colorectal cancer patients treated with Bevacizumab

Abstract

Aims: Our aim in this study was to determine the relationship between metastasis types and mutation subtypes in patients who were followed up in our center and received bevacizumab treatment, to determine the survival rates according to metastasis types, and to contribute to the literature on this subject.
 Methods: In our study, we retrospectively evaluated 42 consecutive metastatic colorectal cancer patients who were admitted to our hospital and diagnosed with colorectal cancer, thorax-abdominal CT scans were performed in our clinic to detect possible metastases, and the presence of metastases in one or more localizations was detected and treated with Bevacizumab.
 Results: The majority of colorectal cancers included in our study had the histopathological subtype of adenocarcinoma (90.5%). Genetic analyses revealed that 47.6% (20 patients) had mutant KRAS gene types, while 52.4% (22 patients) had wild type. The distribution of metastases was as follows; 31 (73.8%) cases with liver involvement, 12 (28.6%) with peritoneal involvement and 24 (57.1%) with lung involvement. In our study, median overall survival was 19 months and median disease-free survival was 7 months.
 Conclusion: The results of studies to date will be useful to help predict prognosis and to select appropriate regimens for treatment. We aimed to contribute to this process by presenting our own data in our own study. However, the true role of RAS genes as prognostic markers continues to be questioned, and multicenter studies are needed on the predictive and prognostic factors of colorectal cancers.