Modeling selective elimination of quiescent cancer cells from bone marrow

Area of Science:

• Oncology
• Drug Discovery
• Cancer Biology

Background:

• Quiescent disseminated tumor cells in bone marrow often resist chemotherapy, leading to recurrent metastases.
• Developing therapies to eliminate these persistent, dormant cancer cells is crucial for preventing cancer recurrence.

Purpose of the Study:

• To establish a novel screening platform for identifying compounds that selectively eliminate quiescent cancer cells.
• To discover effective treatment strategies against dormant tumor cells that evade conventional chemotherapy.

Main Methods:

• Developed a 384-well 3D spheroid model using cancer cells and bone marrow stromal cells, inducing reversible cell cycle arrest in G1/G0 phase.
• Utilized dual-color bioluminescence imaging to quantify cancer and stromal cell viability within the same spheroid.
• Screened single compounds and combination treatments for selective elimination of quiescent cancer cells.

Main Results:

• Identified specific compounds and treatment combinations that preferentially eliminated quiescent breast cancer cells without harming stromal cells.
• Demonstrated that an effective spheroid treatment combination also eliminated breast cancer cells in a mouse xenograft bone marrow model.

Conclusions:

• Established a novel and effective screening platform for therapies targeting quiescent tumor cells.
• The findings facilitate the identification of new drugs to prevent cancer recurrence by eliminating dormant cancer cells.