APC and the three-hit hypothesis.
The seminal 'two-hit hypothesis' implicitly assumes that bi-allelic tumour suppressor gene (TSG) mutations cause loss of protein function. All subsequent events in that tumour therefore take place on an essentially null background for that TSG protein. We have shown that the two-hit model requires modification for the APC TSG, because mutant APC proteins probably retain some function and the two hits are co-selected to produce an optimal level of Wnt activation. We wondered whether the optima...Expand abstract
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