Table 1 Baseline Characteristics between Treatment Groups
| Â | Observation Only N = 120 | Adjuvant Chemoradiation (CRT) Therapy N = 66 | P-Value |
|---|---|---|---|
DEMOGRAPHIC | Â | Â | Â |
Age at Surgery (yr) | Â | Â | Â |
   Mean, (SD*) | 68.9 (11.6) | 62.0 (10.8) | <0.001 |
   Median (Range) | 71.3 (28.7-90.3) | 63.3 (29.3-81.5) |  |
Gender | Â | Â | Â |
   Male, No. (%) | 66 (55.0) | 43 (65.2) | 0.179 |
Institution | Â | Â | Â |
   Mayo Clinic | 63 (52.5) | 19 (28.8) | 0.002 |
   Johns Hopkins Hospital (JHH) | 57 (47.5) | 47 (71.2) |  |
TUMOR CHARACTERISTCS | Â | Â | Â |
T Stage | Â | Â | Â |
   1 | 37 (30.8) | 8 (12.1) | 0.002 |
   2 | 46 (38.3) | 20 (30.3) |  |
   3 | 33 (27.5) | 34 (51.5) |  |
   4 | 4 (3.3) | 4 (6.1) |  |
Tumor Diameter | Â | Â | Â |
   < 3 cm | 81 (67.5) | 39 (59.1) | 0.251 |
   ≥ 3 cm | 39 (32.5) | 27 (40.9) |  |
Nodal Status | Â | Â | Â |
   N0 | 84 (70.0) | 18 (27.3) | <0.001 |
   N1 | 36 (30.0) | 48 (72.3) |  |
Histologic Grading | Â | Â | Â |
   1 | 8 (6.7) | 0 (0.0) | 0.053 |
   2 | 52 (43.3) | 25 (37.9) |  |
   3 | 60 (50.0) | 41 (62.1) |  |
Surgical Margins | Â | Â | Â |
   Positive | 0 (0.0) | 3 (4.6) | 0.019 |
   Negative | 120 (100.0) | 63 (95.4) |  |