Lucky cancer patients with Lazarus-like recovery

For some unsuccessful cancer drugs, there are some few patients with Lazarus-like recovery. Why the same type of cancer can lead to drastically different treatment results? It turns out that same cancer originated from the same organ can be hailed from different mutated genes. A lucky patient with the specific mutated gene that can be blocked by the experimental drug will have remission and even be cured. Iceland already has one-third of its population have genome sequencing. That genome database may be the treasure trove for the future cancer curing.    http://www.newsweek.com/2015/07/31/linkedin-cancer-354877.html