In the past years by scientific research treatments were developed which could be a breakthrough in some types of cancer. These treatments include antibodies or immune therapies (e.g. Immune-checkpoint-inhibitors).
These treatments can only be used if there are certain targets at the tumor cells to be attacked by the specific antibody or other targeted treatments. To check if this is possible special examinations have to be performed on the tumor probe (molecular testing) or by certain tests in the blood (e.g. liquid biopsy).
In some cases it is possible after a surgery to perform a so-called chemotherapy resistancy testing to see which chemotherapy may work or not. (CTR-Test)