Different types of tumor microvessels in stage I-IIIA squamous cell lung cancer and their clinical significance

Table 2 Correlations between different types of tumor microvessels and characteristics of the parenchymal and stromal components of lung squamous cell carcinoma

	Fragmentation in the tumor solid component		The presence of LFFCT in the tumor stroma		Retraction clefts		Tumor spread in the AASs
	Gamma	P value	Gamma	P value	Gamma	P value	Gamma	P value
MVD	0.240	0.24	0.034	0.84	0.042	0.79	-0.537	0.002a
DCs	0.064	0.66	0.014	0.90	0.211	0.06	-0.251	0.04a
ADCs	0.555	0.0006a	-0.537	0.0005a	0.115	0.45	0.248	0.15
SPELs	0.071	0.65	0.124	0.43	0.517	0.0006a	0.435	0.007a
DCs with weak expression of CD34	0.297	0.14	0.943	0.0000a	0.193	0.21	-0.210	0.22
Contact-type DCs	0.344	0.03a	0.502	0.001a	0.666	0.0000a	-0.077	0.66
The capillaries in the tumor solid component	0.040	0.82	0.009	0.96	0.231	0.16	-0.069	0.72
LVs in lymphoid and polymorphic cell infiltrates	-0.538	0.001a	0.054	0.75	0.284	0.07	0.302	0.08

^aP < 0.05, the differences between groups are statistically significant.

AASs: Alveolar air spaces; ADCs: Atypical dilated capillaries; DCs: Dilated capillaries; LFFCT: Loose, fine fibrous connective tissue in the tumor stroma; LVs: Lymphatic vessels; MVD: Microvessel density; SPELs: Structures with partial endothelial lining; CD34: Cluster of differentiation 34.