For example, arginine, proline, glutamate and riboflavin (vitamin B2) metabolisms are enriched with up-regulated genes only in lung cancer; folate biosynthesis and nitrogen metabolism pathways are enriched in breast cancer; formyltetrahydroformate biosynthesis in stomach cancer; and NF-kB activation and Csk activation by cAMP-dependent protein kinase inhibits signaling through T-cell receptor in kidney cancer. Here, NFKB1 is linked to gastric cancer.