Break iafter the last course of chemotherapy

Why a break is necessary after the last course of chemotherapy?

In cases where chemotherapy is not enough effective, some cells of the tumor does not die as a result of exposure and only slow down their biological processes temporarily, so they do not accumulate diagnostic radiopharmaceutical that can lead to a false negative result. After 2-3 weeks, tumor cells return to their normal state and can be seen at the PET/CT scan. Thus, the break after the last course of chemotherapy should be done in order to obtain reliable results of the quality of treatment.