Table 1. Clinicopathological characteristics and Kaplan-Meier cause specific survival (CSS) analysis of SEER hypopharyngeal cancer cases with pathological lymph node involvement.
| Variables | No. | 5-year CSS | Log-rank χ2 | P value |
| Race | 29.840 | <0.001 | ||
| White | 696 | 46.2% | ||
| Black | 155 | 26.7% | ||
| Other | 65 | 37.5% | ||
| Gender | 0.303 | 0.582 | ||
| Male | 750 | 41.7% | ||
| Female | 166 | 44.8% | ||
| Year of diagnosis | 0.156 | 0.925 | ||
| 1988–1994 | 282 | 42.1% | ||
| 1995–2001 | 298 | 43.1% | ||
| 2002–2008 | 336 | 41.4% | ||
| Primary site | 17.637 | 0.003 | ||
| Pyriform sinus | 664 | 43.2% | ||
| Postcricoid region | 20 | 28.7% | ||
| Aryepiglottic fold | 25 | 63.4% | ||
| Posterior wall | 36 | 42.0% | ||
| Overlapping lesion | 24 | 13.8% | ||
| Hypopharynx, NOS | 147 | 42.1% | ||
| Histological grade | 3.230 | 0.520 | ||
| I | 28 | 36.5% | ||
| II | 370 | 44.6% | ||
| III | 406 | 40.8% | ||
| IV | 16 | 0 | ||
| Unknown | 96 | 39.9% | ||
| Surgery of primary site | 1.317 | 0.725 | ||
| None | 216 | 40.0% | ||
| Local excision | 92 | 48.4% | ||
| Pharyngectomy | 595 | 42.4% | ||
| Unknown | 13 | 0 | ||
| Radiation sequence | 25.588 | <0.001 | ||
| No radiation | 226 | 34.5% | ||
| Pre-operative | 50 | 35.1% | ||
| Post-operative | 620 | 46.1% | ||
| Other | 20 | 0 | ||
| Cancer directed surgery | 7.519 | 0.006 | ||
| Yes | 747 | 43.2% | ||
| Other | 169 | 38.9% | ||
| T stage | 38.547 | <0.001 | ||
| T1 | 81 | 65.9% | ||
| T2 | 152 | 56.1% | ||
| T3 | 144 | 39.6% | ||
| T4 | 376 | 33.2% | ||
| Tx | 163 | 41.8% | ||
| N stage | 15.483 | <0.001 | ||
| N1 | 194 | 51.4% | ||
| N2 | 653 | 41.5% | ||
| N3 | 69 | 23.0% | ||
| M stage | 46.848 | <0.001 | ||
| M0 | 871 | 43.8% | ||
| M1 | 31 | 5.4% | ||
| Mx | 14 | 24.2% |