Table 2

Distribution of tumor characteristics and RTOG RPA class by EGFR IHC

VariableWith EGFR IHCa (n = 155)Without EGFR IHCa (n = 113)P
Primary site
 Oral cavity20 (13%)11 (10%)
 Oropharynx82 (53%)77 (68%)0.019
 Hypopharynx19 (12%)15 (13%)
 Supraglottic larynx34 (22%)10 (9%)
T stage
 T111 (7%)4 (4%)
 T241 (26%)36 (32%)0.48
 T358 (37%)44 (39%)
 T445 (29%)29 (26%)
N stage
 N032 (21%)30 (27%)
 N127 (17%)21 (19%)0.47
 N279 (51%)47 (42%)
 N317 (11%)15 (13%)
AJCC group
 Stage II4 (3%)7 (6%)
 Stage III47 (30%)33 (29%)0.34
 Stage IV104 (67%)73 (65%)
RPA-LR Control
 24 (3%)7 (6%)
 378 (50%)55 (49%)
 46 (4%)6 (5%)0.54
 546 (30%)34 (30%)
 619 (12%)10 (9%)
 Not classified2 (1%)1 (1%)
RPA-survival
 226 (17%)27 (24%)
 340 (26%)23 (20%)0.47
 436 (23%)25 (22%)
 553 (34%)38 (34%)
  • a Due to rounding, not all percentages add up to 100%.