TIS

TIS, or Tumor Infiltrating Cells, refers to immune cells that have moved into a tumor. These cells, which include various types like T cells, B cells, and macrophages, are part of the body's attempt to fight the cancer. The presence and activity of TIS can provide information about how the immune system is responding to the tumor, and it can influence how effective certain treatments, like immunotherapy, might be. Essentially, TIS reflects the immune system’s engagement with cancer, which can be a helpful indicator in understanding disease progression and guiding therapy options.