Minimal residual disease (MRD) refers to a very small number of residual tumor cells in the body during or after treatment. representing the persistence of the tumor and the possibility of clinical progress. Circulating tumor DNA (ctDNA) is a DNA fragment actively secreted by tumor cells or released into the circulatory system during the process of apoptosis or necrosis of tumor cells... https://macorners.shop/product-category/heart-shaped-ring-gift-box/