Apoptotic Janus-faced mycotoxins against thoracal and breast metastases

Area of Science:

• Oncology
• Cancer Metastasis Research

Background:

• Abdominal organs (liver, kidney, spleen) are common sites for cancer invasion, but their primary tumors rarely metastasize to distant sites like the breast.
• The metastatic pathway from breast cancer to the liver is well-documented, yet the reverse pathway, from abdominal tumors to the breast, remains understudied.

Purpose of the Study:

• To investigate the metastatic potential of primary abdominal tumors to the breast.
• To elucidate the migratory pathway of abdominal tumor cells to distant sites, specifically focusing on lymph node involvement.

Main Methods:

• Utilized rodent tumor models by implanting tumor cells under the kidney or liver capsule.
• Tracked tumor cell migration using injected colloidal carbon particles to mimic tumor cell dissemination.
• Examined the role of parathymic lymph nodes (PTNs) in the metastatic process.

Main Results:

• Tumor cells implanted in abdominal organs successfully formed primary tumors.
• Tumor cells disseminated via abdominal cavity, diaphragm apertures, and thoracic lymphatics, accumulating in parathymic lymph nodes (PTNs).
• Colloidal carbon particles demonstrated a similar migration pattern to PTNs, validating the observed tumor cell pathway.

Conclusions:

• Abdominal primary tumors possess the capability to metastasize to the breast, contrary to previous assumptions.
• Parathymic lymph nodes (termed internal mammary or parasternal nodes in humans) are critical in the metastatic spread from abdominal tumors.
• Janus-faced cytotoxins inducing apoptosis present a potential therapeutic strategy against abdominal tumor metastasis.