Soon, medicine will reach a whole new level that will increase life expectancy to 150 years. 
I think this will actually happen in our lifespan. IF you see the pace of all developments. I'm pretty sure a Cancer treatment is at most some years away!
Well, technological singularity is expected in 2030-2045, so we may see e.g. nanorobots curing any disease in a humans body, repairing organs or their part etc. In all probability, treating cancer will be the start of a great shift in healthcare.