When a solid cancer is surgically removed, any small piece that is left behind increases the chance of a local recurrence or spread. In a pilot study of dogs with mammary tumors, a disease very similar to human breast cancer, a team found that an injectable dye, which glows under near-infrared light, illuminated cancerous growth in the primary tumor as well as in lymph nodes.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/06/200630125128.htm
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