| 0 | Radiation therapy was administered. |
| 1 | Radiation therapy was not administered because it was not part of the planned first-course treatment. Diagnosed at autopsy. |
| 2 | Radiation therapy was not administered because it was contraindicated due to patient risk factors (comorbid conditions, advanced age, etc). |
| 5 | Radiation therapy was not administered because the patient died prior to planned or recommended treatment. |
| 6 | Radiation therapy was not administered; it was recommended by the patient's physician, but was not administered as part of the first-course therapy. No reason was noted in the patient's record. |
| 7 | Radiation therapy was not administered; it was recommended by the patient's physician, but this treatment was refused by the patient, the patient's family member, or the patient's guardian. The refusal was noted in the patient record. |
| 8 | Radiation therapy was recommended, but it is unknown if it was administered. |
| 9 | It is unknown if radiation therapy was recommended or administered. Death-certificate-only. |