Rac1 has been linked to the kinase mTOR (mammalian target of rapamycin) involved in cell-size regulation (Saci et al., 2011), tumor cell motility (Gulhati et al., 2011; Kim et al., 2011), or chemotactic migration (Hernández-Negrete et al., 2007; Kim et al., 2011). The gene discussed is RAC1; the disease is neoplasm.