Cancer Research UK scientists have found that blocking the pathway used by some kidney cancer cells to generate energy can kill the cancer cells, sparing the healthy ones. The research is published in the journal Nature. Cells need energy to grow and divide. This energy is generated through a process called the TCA cycle (also known as the Krebs cycle), which is supported by a range of cellular catalysts called enzymes. Without these enzymes the cycle grinds to a halt, causing the cells to die.