The dogs trained to spot cancer
NHS trials are currently assessing if dogs could also be used to detect prostate cancer at an early stage.
One study shows that specially trained dogs can pick up the presence of such cancer in urine samples, in 93% of cases.
Iain Duncan Smith's wife Betsy was diagnosed with breast cancer in 2009, and became involved with the charity Medical Detection Dogs.
The former Conservative Party leader says he wants to see it rolled out across the NHS.
You can see the full interview here.
The Victoria Derbyshire programme is broadcast on weekdays between 09:00 and 11:00 on BBC Two and the BBC News channel.
13 Mar 2017