Graphic photos show how dye injected into a tumor area colors a sentinel node, which is biopsied to determine if more nodes must be excised.

Report cites a Sloan-Kettering study that shows sentinel-node biopsy has proven to be an accurate diagnostic tool for early-stage breast cancer.

Research shows that melanoma patients whose cancer has spread to the sentinel lymph nodes have a greater chance of recurrence. Read the findings.

Texas surgeon answers basic questions about sentinel-node biopsy for breast cancer. Find out what it is and what the results may indicate.

Learn how in cases of malignant skin cancer, doctors biopsy involved lymph nodes - sentinels - to determine if additional nodes must be removed.