"Breakthrough in fight to overcome the deadliest cancers: Scientists find way to shut off gene that causes third of all tumours"
It's only in the lab right now, so a safe, effective treatment is, even if possible, a long way off. But it's still pretty exciting.
Other potential good news about cancer cures:
"There's a Whole New Way of Killing Cancer: Stephanie Lee is the Test Case". WARNING: this article is brutally sad. But at the end, it is brilliant with hope.