Table 1 |
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Characteristics of patients operated for breast cancer at the Karolinska Hospital 1994–1996 |
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| Patient categories |
All patients (n = 524) |
No available tissuea (n = 231) |
Excluded for other reasonsb (n = 134) |
Included for analysis (n = 159) |
|
|
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| Mean age at breast cancer diagnosis (years) |
58 |
57 |
58 |
58 |
| Mean tumor size (mm) |
20 |
16 |
24 |
22 |
| Proportion of patients with tumor size <21 mm (%) |
68 |
77 |
57 |
62 |
| Proportion of patients with positive lymph nodes (%) |
26 |
16 |
32 |
38 |
| Proportion deceased (%) |
20 |
12 |
26 |
24 |
|
|
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|
aNo frozen tumors in the tumor bank (n = 231). bLiving abroad (n = 7), actively refused participation (n = 6), degraded tumors (n = 42), insufficient amount of RNA (n = 35), not passed the QC for the arrays (n = 12), profiled on the U95 chip (n = 14), neoadjuvant chemotherapy (n = 12), in situ cancer (n = 5) and stage IV at diagnosis (n = 1). |
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|
Pawitan et al. Breast Cancer Research 2005 7:R953 doi:10.1186/bcr1325 |
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