Dr Kiattisa Sommat, Consultant, National Cancer Centre Singapore, talks about how cancer cells spread in the body.

There are four ways: local invasion, lymphatic spread, hematogenous spread and transcoelomic spread.

Local invasion refers to the cells' continuous growth from its original spot, causing tumours to increase in size and affecting the surrounding organs.

Hematogenous spread refers to cancer cells spreading via bloodstreams, to other parts of the body.