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Corel Medical Series: Cancer
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c17.dxr
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00069_Field_SRC.c17.A.3.txt
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1997-01-28
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and of local lymph nodes in 10 to 30 percent. In over half the cases with lymph node involvement, distant metastases are found.
In over 40 percent of patients, the symptoms that cause them to seek medical attention are due to metastases.
What Causes It Risk factors are poorly defined, although the incidence is twice as high for those using tobacco (cigars, chewing tobacco, cigarettes).