Table 1. Baseline cohort characteristics.
stereotactic body radiation therapy (SBRT), genitourinary (GU), gynecologic (GYN)
| Baseline Characteristics | Number of patients (%) |
| Sociodemographic Factors | |
| Age at Diagnosis of Primary Malignancy | |
| ≤ 50 | 21 (20.0) |
| 51-69 | 55 (52.4) |
| ≥ 70 | 29 (27.6) |
| Age at SBRT | |
| ≤ 50 | 9 (8.6) |
| 51-69 | 48 (45.7) |
| ≥ 70 | 48 (45.7) |
| Sex | |
| Male | 54 (51.4) |
| Female | 51 (48.6) |
| Race | |
| Caucasian | 99 (94.3) |
| African American | 4 (3.8) |
| Asian | 2 (1.9) |
| Pathological Factors | |
| Primary Origin | |
| Colorectal | 38 (36.2) |
| Head/Neck | 17 (16.2) |
| GU | 10 (9.5) |
| Sarcoma | 10 (9.5) |
| GYN | 8 (7.6) |
| Other | 7 (6.7) |
| Breast | 6 (5.7) |
| Melanoma | 5 (4.8) |
| Esophagus | 4 (3.6) |
| Histology | |
| Adenocarcinoma | 54 (51.4) |
| Squamous Cell Carcinoma | 13 (12.4) |
| Sarcoma | 16 (15.2) |
| Other | 22 (21.0) |
| Synchronous or Metachronous | |
| Synchronous | 15 (14.3) |
| Metachronous | 90 (85.7) |
| Location of First Metastasis | |
| Lung | 111 (60) |
| Non-lung Viscera | 20 (10.8) |
| Nodal | 39 (21.1) |
| Bone | 1 (0.5) |
| Multiple Sites | 14 (7.6) |
| Therapeutic Factors (Total lesions treated) | |
| Prior Treatment | |
| Chemo/Hormonal Therapy | 81 (43.8) |
| Radiation Therapy | 2 (1.1) |
| Surgery | 18 (9.7) |
| Multiple Lines | 64 (34.6) |
| None | 20 (10.8) |
| Post SBRT Chemotherapy | |
| Yes | 76 (41.1) |
| No | 109 (58.9) |
| SBRT Characteristics (total lesions treated) | |
| Dose (Gy) | |
| 60 in three fractions | 73 (39.5) |
| 48 in four fractions | 65 (35.1) |
| 54 in three fractions | 22 (11.9) |
| others | 25 (13.5) |
| Number of lesions at SBRT | |
| One | 95 (51.4) |
| Two | 47 (25.3) |
| Three | 21 (11.4) |
| Four to five | 22 (11.9) |