Tumor site	Control group			Epidemic Group			P1	P2	P3
Tumor site	Department of Oncology	Other departments	Total	Department of Oncology	Other departments	Total
Brain	20	5	25	20	19	39	0.868	0.001	0.023
Head & neck	28	10	38	29	19	48	0.853	0.008	0.549
Esophagus	23	26	49	18	41	59	0.749	0.011	0.488
Lung	21	13	34	19	24	43	0.765	0.012	0.368
Breast	9	7	16	7	30	37	0.735	0.001	0.011
Cervix	14	1	15	16	7	23	0.715	0.023	0.268
Rectum	3	2	5	9	6	15	0.432	0.034	0.214
Others	42	13	55	30	26	56	0.253	0.025	0.135