When we talk about a cancer, we are talking about many cells that are growing and multiplying in ways that they should not. These cancer cells can also be supported by normal cells in the body that the cancer cells recruit. When we performed “genome-wide profiling” of a cancer in the past, we measured what was happening in the cancer cells, and usually some normal cells, all blended together and averaged. New technologies allow us to measure what’s happening in individual cells too.

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