More than 75% of the lymph drainage of the breast is to the _____. In breast cancer, it is possible that cancer cells leave the breast and lodge in these nodes. From here, metastasis may develop in other axillary nodes. 
Definitions:
Longitudinal Design
A research strategy where data is collected from the same subjects repeatedly over a period of time.
Different Ages
Distinct stages in life characterized by unique physical, psychological, and social milestones.
Single Group
A group consisting of subjects who are exposed to an experimental or treatment condition, without a separate control group for comparison.
Cross-sectional
A research design that collects data from different participants at a single point in time to compare across groups or variables.
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