The document summarizes the "Hallmarks of Cancer" proposed by Douglas Hanahan and Robert Weinberg in 2000. It identified six common traits or hallmarks that allow normal cells to transform into cancer cells: (1) self-sufficiency in growth signals, (2) insensitivity to anti-growth signals, (3) evading apoptosis, (4) limitless replicative potential, (5) sustained angiogenesis, and (6) tissue invasion and metastasis. In 2011, Hanahan proposed four additional hallmarks: deregulated metabolism, immune evasion, severe chromosomal abnormalities, and chronic inflammation inducing cancer. The document discusses evidence that a metabolic approach may provide further insights into understanding cancer.