A cluster of tumor cells that produces and secretes growth factors to induce surrounding cells to grow and divide are showing which type of cell- to- cell signalling?

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The cluster of tumor cells is secreting growth factors that are inducing surrounding cells to grow and divide. This indicates that the tumor cells are using paracrine signaling, which involves the secretion of signaling molecules that act on neighboring cells. Endocrine signaling involves the secretion of signaling molecules into the bloodstream to act on distant target cells, while neuroendocrine signaling involves the secretion of signaling molecules from nerve cells into the bloodstream to act on target cells. Autocrine signaling involves the secretion of signaling molecules that act on the same cell that produced them.

A Cluster of Tumor Cells That Produces and Secretes Growth