Assertion: tumor's cell | /r/CapableOf | form lump
Facets:
Source sentences:
text: If any of these signals are faulty or missing, cells may start to grow and multiply too much and form a lump called a tumour.
text: It happens when healthy cells in one or both kidneys grow out of control and form a lump (called a tumor).
text: So the cells keep doubling, forming a lump (tumour) that grows in size.
text: Tumours are groups of abnormal cells that form lumps or growths.