Cancer - a term that instills dread. Yet, what if we could decode its mysteries? Tumors skillfully alter their own metabolism, similar to criminals modifying plans to plunder a structure. Our investigation reveals a more distinct vision of this covert destruction. Various tumors customize their metabolic routes, resembling shrewd masterminds. Notably, the decomposition of specific amino acids – BCAAs – plays a leading role in liver and gastrointestinal malignancies. Comprehending these ingenious modifications lays the groundwork for more focused and efficient treatments.