Table 6. Influence of TDs on 5-year DFS and OS in subgroups of npN category.

npN Category	No. of All Patients	All Failure with TDs		All Failure without TDs		5-Years DFS Rate	5-Years OS Rate
		No.	%	No.	%
npN 1a	526	27	29.00%	114	26.30%	72.1% vs.73.6%	76.0% vs.76.2%
npN 1b	629	73	34.10%	134	32.30%	65.4% vs.65.7%	68.9% vs.69.9%
npN 2a	495	107	53.20%	145	49.30%	44.8% vs.46.3%	57.3% vs.58.5%
npN 2b	401	150	71.80%	133	69.30%	25.4% vs.27.6%	36.8% vs.37.5%

Note: the 5-year DFS rates of the subgroups with or without TDs in npN1a, 1b, 2a, 2b were similar (all P < 0.05), and the 5-year OS rates of the subgroups had the similar results (all P < 0.05).