Israeli researchers have discovered a biological control system in human cells that inhibits cancer growth, Ben Gurion University in southern Israel said on Sunday. The discovery could lead to a new class of better cancer drugs. In a study, published in the Proceedings of the National Academy of Sciences of the United States of America, a peer-reviewed multidisciplinary scientific journal, a team of BGU researchers have discovered the biological function of a peptide as an inhibitor of the protein kinase  enzyme. If the kinase instructs a cancer cell to divide and reproduce, blocking the kinase will slow down cancer cell proliferation. Using mouse models and human cells, the researchers found that the examined peptide inhibits cancer cell survival, tumor development, invasion, and metastasis.