Gut bacteria 'may help drugs fight cancer'
Bacteria living deep inside the digestive system seem to alter how cancer drugs work, a study suggests.
Immunotherapies - which harness the body's own defences to fight tumours - can clear even terminal cancer in a small proportion of patients.
However, a small study by the University of Texas found those harbouring a more diverse community of gut bugs are more likely to benefit.
Cancer Research UK said understanding gut bugs had "great potential".
The human body is home to trillions of micro-organisms - estimates suggest our own tissues are so heavily outnumbered that our bodies are just 10% human.
And a growing wealth of studies shows these microbes can influence our immune systems and have been implicated in auto-immune diseases and allergies.