In the 1990s clinical trial used to approve IL-2, 4% of patients died from side effects.

FORBES: Connect

One such protein, IL-2, was once touted as a miracle drug but is so toxic it is not able to be used much.

FORBES: A Biotech Billionaire And His Radical DNA Drug That Kills Cancer From Within

The patient who saw his tumour completely disappear was given the vaccine plus a drug called IL-2, already given as standard treatment for kidney cancer.

BBC: Vaccine 'tackles kidney cancer'

The Pulkovo Airlines Ilyushin Il-86 - bound for St Petersburg - came down in a forest about 700 metres (2, 300 feet) from the airport.

BBC: Moscow crash jet 'stabiliser jammed'