Table 5 Adjusted 1 relative risk estimates of receiving radiotherapy treatment after breast conserving surgery
Adjusted1relative risk estimates (95% confidence interval) | |||
|---|---|---|---|
Stage I | Stage II | Stage III | |
Age at diagnosis | P < 0.001 | P < 0.001 | P = 0.37 |
<50 | 1.00 | 1.00 | 1.00 |
50-59 | 1.00 (0.98, 1.02) | 0.99 (0.96, 1.02) | 1.02 (0.96, 1.10) |
60-69 | 0.99 (0.96, 1.01) | 1.02 (0.99, 1.04) | 1.02 (0.92, 1.10) |
70-79 | 0.94 (0.91, 0.97) | 1.01 (0.96, 1.04) | 1.03 (0.90, 1.11) |
≥80 | 0.49 (0.43, 0.56) | 0.53 (0.43, 0.64) | 0.64 (0.34, 1.05) |
Geography of surgery | P = 0.09 | P = 0.07 | P = 0.87 |
Calgary | 1.00 | 1.00 | 1.00 |
South | 0.96 (0.91, 1.00) | 0.94 (0.86, 1.00) | 1.03 (0.89, 1.11) |
Central | 0.96 (0.91, 1.01) | 0.97 (0.90, 1.01) | 1.03 (0.86, 1.11) |
Edmonton | 0.99 (0.98, 1.01) | 1.00 (0.98, 1.03) | 1.03 (0.97, 1.10) |
North | 0.95 (0.88, 1.00) | 0.92 (0.81, 1.01) | 1.03 (0.82, 1.12) |
Year of diagnosis | P = 0.25 | P = 0.15 | P = 0.96 |
2002 - 2004 | 1.00 | 1.00 | 1.00 |
2005 - 2007 | 0.99 (0.97, 1.01) | 0.97 (0.94, 1.00) | 1.00 (0.94, 1.06) |
2008 - 2010 | 1.00 (0.98, 1.02) | 0.98 (0.96, 1.01) | 0.99 (0.92, 1.06) |
ER/PR Status & Hormone therapy | P < 0.001 | P < 0.001 | P < 0.001 |
ER/PR positive & received hormone | 1.00 | 1.00 | 1.00 |
ER/PR positive & no hormone | 0.86 (0.83, 0.89) | 0.59 (0.49, 0.68) | 0.35 (0.16, 0.60) |
ER/PR negative | 0.94 (0.91, 0.97) | 0.89 (0.84, 0.93) | 0.95 (0.85, 1.02) |
Neo-adjuvant chemotherapy | P = 0.33 | P = 0.04 | P = 0.86 |
Not received | 1.00 | 1.00 | 1.00 |
Received | 0.89 (0.52, 1.05) | 1.10 (1.00, 1.14) | 1.03 (0.72, 1.47) |
Adjuvant chemotherapy | P = 0.62 | P < 0.001 | P < 0.001 |
Not received | 1.00 | 1.00 | 1.00 |
Received | 1.01 (0.98, 1.02) | 1.08 (1.05, 1.13) | 1.37 (1.14, 1.84) |