Hi Rhubarb,
I have CF and I have the DF508/V520F genotype.
I'm 34 years old and have about 40% lung function.
I had meconium ileus when I was born and am pancreatic insufficient so have to take enzymes.
According to the publication below, The V520F mutation is a class III mutation (similar to G551D).
So the V520f mutation may respond to VX770 similarly to G551D.
My fingers are certainly crossed.
Pediatr Pulmonol. 2001 Jan;31(1):1-12: European Epidemiologic Registry of Cystic Fibrosis (ERCF): comparison of major disease manifestations between patients with different classes of mutations
EDIT: New information shows kalydeco/ivacaftor monotherapy has no effect on V520F. Which sucks...