Table 3. Human papillomavirus prevalence in oropharyngeal squamous cell carcinomas, select United States registries, 1995–2005*.
| Variable | No. (%) cases, N = 557 |
|---|---|
| Characteristic | |
| HPV (any type) | 403 (72.4) |
| High risk† | 396 (71.1) |
| Low risk‡ | 7 (1.3) |
| Negative | 154 (27.6) |
| Single type | 381 (68.4) |
| Multiple types§ |
22 (3.9) |
| Type | |
| HPV-16 | 337 (60.5) |
| HPV-33 | 31 (5.6) |
| HPV-18 | 14 (2.5) |
| HPV-35 | 11 (2.0) |
| HPV-39 | 5 (0.9) |
| HPV-31 | 4 (0.7) |
| HPV-52 | 4 (0.7) |
| HPV-45 | 3 (0.5) |
| Other HPV types | 16 (2.9) |
*HPV, human papillomavirus; high risk, virus type is associated with high oncogenic potential; low risk, virus type is associated with low oncogenic potential. †Positive for any of HPV types 16, 18, 31, 33, 35, 39, 45, 51, 52, 56, 58, 59, 66, and 68. ‡Positive for types other than those identified as high risk. §HPV-16/-33 (6 cases), HPV-16/-18 (3 cases), and HPV-16/-31(3 cases).