Vliv velikosti nádorové masy a stavu p16 na léčebné výsledky - dosažení kompletní remise u prospektivně sledovaných pacientů s nádory orofaryngu

Title in English Effect of tumor size and p16 status on treatment outcomes - achievement of complete remission in prospectively followed patients with oropharyngeal tumors


Year of publication 2019
Type Article in Periodical
Magazine / Source Klinická onkologie
MU Faculty or unit

Faculty of Medicine

Web https://www.prolekare.cz/casopisy/klinicka-onkologie/2019-1-1/vliv-velikosti-nadorove-masy-a-stavu-p16-na-lecebne-vysledky-dosazeni-kompletni-remise-u-prospektivne-sledovanych-pacientu-s-nadory-orofaryngu-107524
Doi http://dx.doi.org/10.14735/amko201958
Keywords Complete remission; Oropharyngeal neoplasm; sP16 status; Treatment outcome; Tumor burden
Description Background: Oropharyngeal squamous cell tumors associated with human papillomavirus infection (p16 positive tumors) have better prognosis than p16 negative tumors regardless of the more advanced stage of the disease. Tumor volume (GTVt+n) is generally an important factor affecting treatment results of ionizing radiation. The aim of this prospective non-randomized study is to evaluate the effect of tumor volume on the (chemo) radiation treatment results in a group of patients with p16 negative and p16 positive oropharyngeal tumors. Patients and Methods: Patients with confirmed squamous cell tumor of the oropharynx of stages III and IV, according to the 7th version of the TNM (tumor-nodes-metastases) classification, were eligible for this study. The main exclusion criteria were palliative treatment, neoadjuvant chemotherapy or planned concomitant therapy with cetuximab. Patients were treated according to standardized protocols with curative intent. Primary tumor volume (GTVt) and involved nodes volume (GTVn) were obtained from radiotherapy planning system for further statistical analysis. The differences in tumor volumes between the groups according to p16 expression were assessed with subsequent testing of probability to achieve complete remission (CR) of the disease in both groups. Results: In total, 49 patients – 84% men, median age 60.5 years, 25 (51%) patients p16 positive, 40 (82%) underwent concomitant chemoradiotherapy. Median of GTVt in the whole patients group is 40.2 ccm, GTVn 11.78 ccm and median volume of the whole tumor burden (GTVt+n) 70.21 ccm (range 11.05–249). Median of GTVn was greater in the p16 positive cohort (p = 0.041). In the entire group, the median time to reach CR was 91 days (95% CI 86–107 days) from the end of radiotherapy. In the group of p16 negative patients, 14 achieved CR (61%) out of 23 patients, in p16 positive group 20 (80%) out of 25 patients (p - 0.111). P16 negative patients had a longer time to CR (p = 0.196, HR 1.58, 95% CI 0.79-3.18). None of the independently assessed volumetric parameters of the tumor (GTVt, GTVn, GTVt+n) affected CR in the p16 positive patients group, while there was a significant impact of the whole tumor burden (GTVt+n) in the p16 negative cohort (median 58.1 ccm in CR patients vs. 101.9 ccm, p = 0.018). Conclusion: We have showed less GTVt+n dependence to achieve CR in p16 positive tumors in comparison with p16 negative tumors. Thus, p16 positive oropharyngeal squamous cell cancers should not be withdrawn from the curative treatment intent based on the greater GTVt+n.
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