Knowledge of a cancer diagnosis is a protective factor for the survival of patients with breast cancer: a retrospective cohort study

Table 2 Survival of breast cancer patients with different characteristics

Variable	Death number/Total number	3-year survival rate	5-year survival rate	P^*
Knowing status of cancer diagnosis ^a				< 0.001
Did know	1446/9466	0.89	0.85
Did not know	778/2756	0.79	0.73
Sex				0.011
Male	29/93	0.78	0.70
Female	2300/12234	0.86	0.81
Age (years)				< 0.001
< 45	259/1944	0.90	0.87
45-	543/3821	0.90	0.86
55-	473/3488	0.89	0.86
65-	408/1789	0.85	0.78
≥ 75	646/1285	0.62	0.51
Clinical stage ^b				< 0.001
Stage 0- I	197/3640	0.97	0.95
Stage II	480/3700	0.92	0.88
Stage Ш	316/1136	0.78	0.70
Stage IV	358/517	0.44	0.33
Surgery history				< 0.001
Yes	890/6697	0.91	0.87
No	1439/5630	0.80	0.75
Diagnostic year ^c
1: before 2006	1164/3268	0.82	0.76	< 0.001
2: 2007–2011	815/4074	0.86	0.82
3: 2012–2016	350/4985	0.91	0.89
Hospital grade				< 0.001
Primary grade hospital	95/166	0.47	0.41
Middle grade hospital	972/5088	0.86	0.82
High grade hospital	1262/7073	0.87	0.82

^*overall comparison of survival curves in subgroups
^a patients with unclear knowing status of cancer diagnosis were not included
^b patients with unclassified clinical stage were not included
^c Diagnostic year 1 means those being diagnosed before 2006, 2 means those being diagnosed from 2007 to 2011, 3 mean those being diagnosed from 2012 to 2016

ISSN: 1471-2407