smoking and lung cancer?

Question

-at what stage might metastasis start to occur?
-cancer cells often use lymph vessels as pathways to other parts of the body, where they continue to divide. Why does this characteristc make cancer espcielaly dangerous?

Answer 1

Cancer stages are graded by their metastatic properties, so your question doesn't really fit. You could never smoke and still get lung ca. You could smoke for 30 years and not get lung ca. There is a definate, significant increase if you do smoke (so don't do it). NOt to mention emphazema and other nasty illnesses. Metastatic lung ca is stage 3 and 4 i think.

Also the question regarding lymph nodes is phrased poorly. It's the fact that cancers can break off, enter the blood stream, emerge somewhere else and grow that make them so damn difficult to treat (esp. late stage). Once you have mets its very difficult to treat; for every met you'd have to radiate, surgury. Also met. cancer is highly mutagenic so its likely to survive whatever you throw at it. Early stage cancers will respond much better to treatment.

Answer 2

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