Table 1.

Relationship of serum IL-33 levels with clinicopathological parameters of breast cancer patients.

Variables	IL-33 level (pg/ml)
	N	Mean	SD	P value
Age
≤50 years	30	35.87	11.00	0.481
>50 years	34	38.21	14.78
Menopausal statusa
No	33	36.19	11.33	0.992
Yes	30	36.52	12.26
Size
≤2 cm	26	36.50	11.52	0.760
>2 cm	38	37.53	14.21
AJCC stage
I + II	44	37.93	12.11	0.465
III	20	35.32	15.23
Histological gradeb
1 + 2	30	36.51	13.58	0.915
3	23	36.14	10.64
ER expressionc
Negative	26	32.79	10.84	0.033
Positive	37	39.92	13.97
PR expressionc
Negative	32	36.76	16.28	0.896
Positive	31	37.20	9.17
HER2 expressionc
No	46	37.82	14.28	0.409
Yes	17	34.71	9.48
Ki-67 expressionc
Low	15	43.74	19.40	0.021
High	48	34.86	9.86
Lymph node metastasis
≤3	56	37.59	13.52	0.445
>3	8	33.78	9.67
Family history
No	58	36.00	11.69	0.034
Yes	6	47.81	21.29

^aOne case missing this information because the patient was male.

^bTwo cases with invasive lobular carcinomas, one case with an intraductal papillary carcinoma, and in eight cases, only biopsy samples were available without information on histological grade.

^cOne case was discharged after biopsy, without information on ER, PR, HER2, and Ki-67 expression.