Objective: The present study has been designed to find a possible new route for the metastasis of cancer cells on the fascia surrounding tumor tissue using a novel technique of trypan blue staining.
Materials And Methods: Tumor tissues were grown in the skin of nude mice after sub-cutaneous inoculation with human lung cancer cells. Trypan blue was recently identified as a dye with specificity for Bonghan ducts (BHDs) and not other tissues, such as blood or lymph vessels or nerves.
Results: We demonstrate that the trypan blue staining technique allows the first visualization of BHDs which are connected to tumor tissues.
Conclusion: Since BHDs are known to make up a circulatory system corresponding to acupuncture meridians or collaterals, we propose that, in addition to the currently known blood or lymph vessels, BHDs on tumor tissue fascia may be a novel pathway for metastasis.
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