TABLE 4.
Multivariate analysis of predictors of receipt of IMRT in the last 12 months of life after metastatic cancer diagnosis among those who received RT
| Variable | Adjusted OR | 95% CI | p value |
|---|---|---|---|
| Year of death | |||
| 2002 | 1.00 | ||
| 2003 | 1.60 | 0.95–2.70 | 0.08 |
| 2004 | 2.49 | 1.53–4.03 | 0.0002 |
| 2005 | 3.76 | 2.36–5.99 | <0.0001 |
| 2006 | 4.18 | 2.63–6.64 | <0.0001 |
| 2007 | 5.85 | 3.72–9.20 | <0.0001 |
| Race/Ethnicity | |||
| Non-Hispanic White | 1.00 | ||
| Non-Hispanic Black | 1.41 | 1.01–1.97 | 0.05 |
| Hispanic | 1.67 | 1.12–2.50 | 0.01 |
| Other | 1.99 | 1.36–2.92 | 0.0004 |
| Marital status | |||
| Married | 1.00 | ||
| Unmarried | 0.95 | 0.73–1.25 | 0.72 |
| Unknown | 0.67 | 0.53–0.86 | 0.0018 |
| Cancer type | |||
| Breast | 1.00 | ||
| Colorectal | 1.37 | 0.72–2.65 | 0.34 |
| Lung | 0.92 | 0.56–1.52 | 0.74 |
| Pancreas | 4.89 | 2.76–8.68 | <0.0001 |
| Prostate | 0.87 | 0.45–1.70 | 0.70 |
| SEER region | |||
| Midwest | 1.00 | ||
| Northeast | 1.50 | 0.99–2.27 | 0.05 |
| South | 2.15 | 1.45–3.19 | 0.0001 |
| West/Hawaii | 1.41 | 1.01–1.97 | 0.05 |
| Median income in census tract | |||
| Lowest quartile | 1.00 | ||
| Second quartile | 0.76 | 0.58–1.00 | 0.05 |
| Third quartile | 0.51 | 0.38–0.70 | <0.0001 |
| Highest quartile | 0.64 | 0.47–0.86 | 0.0030 |
| Unknown | 0.87 | 0.54–1.40 | 0.56 |
| Radiation Oncologists per 100,000 | |||
| 0 | 1.00 | ||
| 1–3 | 0.82 | 0.57–1.17 | 0.28 |
| 4–24 | 1.08 | 0.76–1.52 | 0.68 |
| 25–147 | 2.11 | 1.54–2.89 | <0.0001 |
| Hospice | |||
| No | 1.00 | ||
| Yes | 0.76 | 0.62–0.92 | 0.01 |
| Type of RT facility | |||
| Free-standing | 1.00 | ||
| Hospital-based | 0.50 | 0.41–0.61 | <0.0001 |
Age, gender, co-morbidities, educational level and urban versus rural residence did not reach significance in the adjusted model and thus results for these variables are not shown here.