On top of all this, the lungs provide us with oxygen exchange: as the body's entire stock of blood passes through the lungs, the chances of a cancer cell being carried away are greater; the lungs also absorb more of the body's waste products than any other organ, so that cancer cells may also easily pass through the lymph system to the lymph nodes.
再加上肺臟是充血器官，全身的血液都要經過肺來換氣，將癌細胞「夾帶」出去的機會就更高了；而肺也是吸收體內廢棄物最多的器官，很容易經由淋巴系統轉移到淋巴結。