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(A) NLGMT subgroup, tracheal cancer specific survival (TCSS): χ2 = 10.60, p = 0.001. (B) LGMT subgroup, tracheal cancer specific survival (TCSS): χ2 = 0.02, p = 0.876. * No “median survival” calculated in LGMT subgroup because event happened in less than 50% patients at the end of follow-up.
