Some research suggesting that cancer is a metabolic disorder and can be treated with a chemical that activates mitochondria (and apoptosis) within cancer cells (PDF isn't yet available):

The unique metabolic profile of cancer (aerobic glycolysis) might confer apoptosis resistance and be therapeutically targeted. Compared to normal cells, several human cancers have high mitochondrial membrane potential (DeltaPsim) and low expression of the K+ channel Kv1.5, both contributing to apopt …

More info:

Researchers at the University of Alberta have shown that a nontoxic molecule shrinks cancers tumors, including lung, breast and brain. The results of the research will be published in the journal Cancer Cell.

It sounds pretty promising, but I'll reserve judgement until I see the actual data.