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Kaplan–Meier analysis according to higher TrkB expression at the invasive front. In the test subgroup (n=98, A), patients with higher TrkB expression at the invasive front (n=38) had significantly poorer prognosis than those without it (n=60, P=0.0013). In the validation subgroup (n=222, B), patients with higher TrkB expression at the invasive front (n=27) had significantly poorer prognosis than those without it (n=195, P<0.0001).
