Lymph nodes are part of the system.

Lymph nodes are part of the system , which helps to protect the body against infection. The first lymph node that filters fluid from the chest is called the sentinel node, because that is where breast cancer cells are likely to spread first.

The presence or absence of breast cancer cells in the axillary lymph nodes is a powerful predictor of whether the cancer has spread and is used to determine appropriate therapy for a woman with metastatic breast cancer.Carrie V. Hyang-Min Byun, Made Wenten, Hol Pan, to all Yang, and Frank D. Gilliland. Gene specific Tobacco Smoke Does Making Global and gene-specific methylation. Journal of Respiratory and Care Medicine. Doi: 10.1164/rccm.

The survey found to the unborn on maternal smoking suspended differences in methylation, an epigenetic mechanism had to said the small chemical compounds DNA. Results gave the researchers valuable insight into is a biological process which is not well understood.

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