Unexpected Friendship: Neutrophils Help Tumor Cells En Route to Metastasis.

Circulating tumor cells (CTCs) contain metastatic precursors that can initiate new metastases. Recent work shows that association with neutrophils provides a proliferative advantage to CTCs, rendering them more competent in metastasis formation. The study identifies molecular players in CTC-neutrophil interactions, providing potential targets for disrupting formation of these deadly metastatic seeds.