Though i am an electrical engineer and have nothing to do with medical. but this thought comes to my mind again and again that cancer is caused by roots of vegetables like garlic, onions etc that have surviving ability in very unwanted conditions. The growth rate of cancer and such vegetables is rapid not normal growth of cells in human body. it is also in holy quran people demanded garlic, onions and cereals in replacement of mana and salwa which Allah says that demanded in replacement of that was better. this strengthens my belief once world will come to know this fact. If any reserchers of cancer can look into these comments and find a solution for the sufferings of mankind due to cancers the cause of which is still undiscovered.