Thomas E. Carey, Nadine Jawad, Heather M. Walline, Wei-Chen Yen, Kai-Ping Chang, Lisa M. Pinatti, Chun-I Wang, Guadalupe Lorenzatti Hiles, Christine M. Goudsmit, Hannah L. Briggs, Trey B. Thomas, Macy A. Afsari, Emily Bellile, Anna C. Morris, and Lila Peters
Background In North America and Western Europe, human papillomavirus (HPV)-driven oropharyngeal squamous cell carcinoma (OPSCC) has increased dramatically over the past 40 years, whereas HPV-negative OPSCC, typically associated with alcohol and tobacco as etiological factors, has declined. In Taiwan, the OPSCC rate is increasing; however, there is limited understanding of the role of HPV, as tobacco, alcohol, and betel quid use are still very prominent. Here we investigated the involvement of HPV and its prognostic implications for OPSCC in Taiwan. Methods and findings We studied a retrospective cohort of 541 OPSCCs undergoing care between 1998 and 2016 at the Chang Gung Memorial Hospital-Linkou, Taiwan. Clinical and risk exposure data were retrieved from hospital charts. Most cases were males (94%) and had concomitant (87%) exposure to alcohol (51%), tobacco (83%), and betel quid (65%). Formalin-fixed, paraffin-embedded tissue sections were immunostained for p16, a surrogate for active HPV, and DNA was tested for HPV detection and genotyping by Multiplex PCR-MassArray. Tumors with p16 and/or HPV DNA positivity were identified as HPV-positive. HPV status was assigned to 528 tumors. The prevalence of HPV-positive OPSCC was 28.4% (150/528), with a strong correlation between p16 and HPV DNA results (F Among males more tumors were HPV-negative than positive, but among the 34 females more tumors were HPV-positive (62% vs. 38%, p For all patients, HPV-positive OPSCC was associated with higher age at diagnosis (55.5 vs. 52.7 years, p = 0.004), and lower T-stage (p = 0.02). HPV-positivity in OPSCC tumors was an independent predictor of better overall survival (OS) (hazard ratio [HR] 0.57 [95% CI 0.41-0.80], p = 0.0009), and disease-free survival (DFS) (HR 0.53 [95% CI 0.40-0.72], p Conclusions Consistent with the increasing role of HPV on OPSCC globally, HPV is an important etiological factor in more than one-fourth of OPSCC cases from Chang Gung Hospital. Like in Western countries, HPV provides considerable independent survival benefits to OPSCC, but the added prognostic value is reduced by exposure to the risk factors, alcohol, smoking, and betel quid. There is a need to consider HPV as an etiologic factor in treatment and in cancer-prevention policies in Taiwan. AUTHOR SUMMARY Why was this study done? Oropharyngeal squamous cell carcinoma (OPSCC) caused by human papillomavirus (HPV) has been increasing with epidemic proportions in North America and West Europe during the last 40 years. Socioeconomic changes have propelled the advance of this disease, and transformation from the classic etiology of OPSCC, alcohol, and tobacco, to HPV. Contrarily, in Taiwan, OPSCC has been drastically increasing due to persistent heavy consumption of alcohol, smoking, and betel quid chewing, limiting the understanding of HPV contribution to OPSCC. This study investigated the role of HPV in OPSCC in Taiwan. What did the researchers do and find? We conducted a comprehensive retrospective cohort study for 541 OPSCC cases diagnosed between 1998-2016 at the Chang Gung Memorial Hospital-Linkou, Taiwan. We found that OPSCCs mostly occurred in men (94%) and risk factors, including use of alcohol, tobacco, and betel quid was high (87%). Active HPV was present in 28.4% of the cases, 25% of tumors from males and 62% of tumors from females were HPV-positive. HPV16 was the most prevalent genotype (76.9%), followed by HPV58 (7.5%). Most of the HPV-positive OPSCCs originated in the tonsils, and females were less likely to abuse alcohol, tobacco, and betel quid than the males. Furthermore, outcome analysis showed that for the whole cohort, HPV positivity was associated with significantly better OPSCC survival. Alcohol was a strong negative prognostic factor. The robust prognostic benefit of HPV persisted in the presence of all other risk factors. What do these findings mean? HPV is an important emerging etiologic factor of OPSCC in Taiwan, and an independent predictor for better prognosis. The strong association of HPV with OPSCC over a period of 18 years suggests that societal behavioral changes are occurring; and, that there is a potential for benefit from interventions to improve treatment and prevent HPV-positive OPSCC in Taiwan and South-East Asia.