Table 2. The correlations of the serum miR-375-3p level with SCLC clinical features in cohort 3.

Clinical features	Group	Low miR-375-3p expression	High miR-375-3p expression	P value
Sex	Female	6	8	0.5906
	Male	28	27
Age	<60	14	14	0.9207
	≥60	20	21
T	T1-T2	19	9	0.0107*
	T3-T4	15	26
N	N0-N1	9	1	0.0053**
	N2-N3	25	34
M	M0	23	17	0.1085
	M1	11	18
Stage	I-II	5	0	0.0185*
	III-IV	29	35

SCLC, small cell lung cancer; T, tumor; N, node; M, metastasis. *, P<0.05; **, P<0.01.