Recently, Memorial Sloan Kettering Cancer Center (MSKCC) published their 10000 tumor patients DNA sequencing data on nature medicine, but the website to use the data is too complicated and not convenient.
I developed an online tool with very simple UI to query MSK-IMPACT data. Just search by gene and mutation, the result will show the samples having this mutation, along with these samples' clinical information.
The tool is at: http://opengene.org/msk
Here is a screenshot: