Characteristics of HNSC patients
| Sex | ||
| Male | 61 (80.3%) | |
| Female | 15 (19.7%) | |
| Age (y) | ||
| Mean | 57 | |
| Median | 56 | |
| Range | 25-89 | |
| Race | ||
| Caucasian | 63 (82.9%) | |
| African-American | 11 (14.5%) | |
| Other | 2 (2.6%) | |
| Smoking | ||
| Never | 17 (23.6%) | |
| Former | 20 (27.8%) | |
| Current | 35 (48.6%) | |
| Alcohol | ||
| Never | 25 (37.9%) | |
| Former | 8 (12.1%) | |
| Current | 33 (50%) | |
| Radiation | ||
| No radiation | 28 (37.3%) | |
| Radiation | 47 (62.7%) | |
| Pathologic stage | ||
| I | 13 (18.1%) | |
| II | 8 (11.1%) | |
| III | 12 (16.7%) | |
| IV | 39 (54.2%) | |
| Tumor site | ||
| OC | 41 (54.7%) | |
| OP | 14 (18.7%) | |
| L | 17 (22.7%) | |
| HP | 3 (4%) | |
| Disease status | ||
| NED | 51 (67.1%) | |
| AWD | 5 (6.6%) | |
| DOD | 10 (13.2%) | |
| DUC | 4 (5.3%) | |
| LFU | 6 (7.9%) | |
| Mean mtDNA content | ||
| Cox I | ||
| Pretreatment saliva | 0.0813 | |
| Posttreatment saliva | 0.0588 | |
| Cox II | ||
| Pretreatment saliva | 0.0602 | |
| Posttreatment saliva | 0.0408 | |
| Sex | ||
| Male | 61 (80.3%) | |
| Female | 15 (19.7%) | |
| Age (y) | ||
| Mean | 57 | |
| Median | 56 | |
| Range | 25-89 | |
| Race | ||
| Caucasian | 63 (82.9%) | |
| African-American | 11 (14.5%) | |
| Other | 2 (2.6%) | |
| Smoking | ||
| Never | 17 (23.6%) | |
| Former | 20 (27.8%) | |
| Current | 35 (48.6%) | |
| Alcohol | ||
| Never | 25 (37.9%) | |
| Former | 8 (12.1%) | |
| Current | 33 (50%) | |
| Radiation | ||
| No radiation | 28 (37.3%) | |
| Radiation | 47 (62.7%) | |
| Pathologic stage | ||
| I | 13 (18.1%) | |
| II | 8 (11.1%) | |
| III | 12 (16.7%) | |
| IV | 39 (54.2%) | |
| Tumor site | ||
| OC | 41 (54.7%) | |
| OP | 14 (18.7%) | |
| L | 17 (22.7%) | |
| HP | 3 (4%) | |
| Disease status | ||
| NED | 51 (67.1%) | |
| AWD | 5 (6.6%) | |
| DOD | 10 (13.2%) | |
| DUC | 4 (5.3%) | |
| LFU | 6 (7.9%) | |
| Mean mtDNA content | ||
| Cox I | ||
| Pretreatment saliva | 0.0813 | |
| Posttreatment saliva | 0.0588 | |
| Cox II | ||
| Pretreatment saliva | 0.0602 | |
| Posttreatment saliva | 0.0408 | |
Abbreviations: OC, oral cavity; OP, oral pharyngeal; L, laryngeal; HP, hypopharyngeal; NED, no evidence of disease; AWD, alive with disease; DOD, dead of disease; DUC, dead of unknown cause; LFU, lost follow-up.