De-escalated Radiotherapy for Primary Tumor After Neoadjuvant Therapy With Toripalimab Plus Chemotherapy for Nasopharyngeal Carcinoma

In the IMRT era, patients with stage II-III (AJCC8th) nasopharyngeal carcinoma achieve high local control. However, survivors are increasingly experiencing late radiation-induced toxicities. A previous study found that reducing the radiation dose to the primary site to 60Gy for patients who achieved partial or complete response to induction chemotherapy resulted in a lower rate of late toxicities and an inferior local control rate. The investigators aim to reduce the radiation dose to the primary site for patients after immunochemotherapy, given the potential of neoadjuvant chemotherapy and immunotherapy to increase response rates and long-term survival. The protocol includes participants with stage II-III (AJCC8th), except T2N0M0, to receive three courses of neoadjuvant gemcitabine plus cisplatin and Toripalimab. If the primary tumour regresses by over 75%, de-escalated radiotherapy with 60Gy will be administered, and participants will receive two cycles of cisplatin and three cycles of Toripalimab during the radiotherapy course. Otherwise, participants will receive conventional radiotherapy and concurrent chemotherapy with cisplatin for two cycles as usual. The aim of this study is to investigate the 3-year local control rate and toxicities of de-escalated radiotherapy.

Sex

All

Minimum age

18 Years

Maximum age

70 Years

Inclusion Criteria:

1. Pathologically confirmed nasopharyngeal carcinoma, patients who have not received anti-cancer therapy;
2. ECOG performance status score (PS score) 0 or 1.
3. 18-70 years old.
4. Stage II-III except T2N0M0 (AJCC 8th).
5. Neutrophil count ≥ 1.5 × 10\^9/L, hemoglobin ≥ 90 g/L and platelet count ≥ 100 × 10\^9/L.
6. Alanine aminotransferase (ALT)/aspartate aminotransferase (AST) ≤ 2.5 times the upper limit of normal (ULN), bilirubin ≤ 1.5 times ULN; Creatinine clearance ≥ 60 ml/min
7. Patients are required to sign an informed consent form and must be willing and able to comply with the visits, treatment plan, laboratory tests, and other requirements specified in the study protocol

Exclusion Criteria:

Patients will be excluded from the study, if any of the following criteria is met:

1. Over the age of 70 or under the age of 18.
2. HBsAg positive and HBV DNA ≥ 1 × 10\^3 copies/ml
3. HCV antibody positive.
4. Subjects with active, known or suspected autoimmune diseases were excluded from the study. Eligible participants included those with type 1 diabetes mellitus, hypothyroidism requiring only hormone replacement therapy, and skin conditions that do not require systemic therapy such as vitiligo, psoriasis, or alopecia.
5. History of interstitial lung disease;
6. Receiving systemic sex hormones or other immunosuppressive therapy at equivalent doses ≥ 10 mg prednisone/day within 28 days prior to signing informed consent; Subjects with systemic sex hormone doses ≤ 10 mg prednisone/day or inhaled/topical corticosteroids were eligible.
7. Received or about to receive live vaccines within 30 days before signing the informed consent form;
8. Pregnant or lactating women;
9. Other malignancies within 5 years, except carcinoma in situ, adequately treated non-melanoma skin cancer and papillary thyroid cancer;
10. Known previous hypersensitivity to macromolecular protein preparations, or to any component of Toripalimab;
11. Human immunodeficiency virus (HIV) infection.
12. Other conditions that may affect the safety of subjects or trial compliance as judged by the investigator, including symptomatic heart failure, unstable angina pectoris, myocardial infarction, active infection requiring systemic treatment, mental illness or family and social factors;

• RESULTundefined
• RESULTLiu YP, Wen YH, Tang J, Wei Y, You R, Zhu XL, Li J, Chen L, Ling L, Zhang N, Zou X, Hua YJ, Chen YM, Chen L, Lu LX, Chen MY, Wen WP. Endoscopic surgery compared with intensity-modulated radiotherapy in resectable locally recurrent nasopharyngeal carcinoma: a multicentre, open-label, randomised, controlled, phase 3 trial. Lancet Oncol. 2021 Mar;22(3):381-390. doi: 10.1016/S1470-2045(20)30673-2. Epub 2021 Feb 15. PMID 33600761
• RESULTPeng H, Chen L, Zhang Y, Li WF, Mao YP, Liu X, Zhang F, Guo R, Liu LZ, Tian L, Lin AH, Sun Y, Ma J. The Tumour Response to Induction Chemotherapy has Prognostic Value for Long-Term Survival Outcomes after Intensity-Modulated Radiation Therapy in Nasopharyngeal Carcinoma. Sci Rep. 2016 Apr 21;6:24835. doi: 10.1038/srep24835. PMID 27099096
• RESULTYao JJ, Jin YN, Lin YJ, Zhang WJ, Marks T, Ryan I, Zhang HY, Xia LP. The feasibility of reduced-dose radiotherapy in childhood nasopharyngeal carcinoma with favorable response to neoadjuvant chemotherapy. Radiother Oncol. 2023 Jan;178:109414. doi: 10.1016/j.radonc.2022.11.003. Epub 2022 Nov 11. PMID 36375563
• RESULTChen AM, Felix C, Wang PC, Hsu S, Basehart V, Garst J, Beron P, Wong D, Rosove MH, Rao S, Melanson H, Kim E, Palmer D, Qi L, Kelly K, Steinberg ML, Kupelian PA, Daly ME. Reduced-dose radiotherapy for human papillomavirus-associated squamous-cell carcinoma of the oropharynx: a single-arm, phase 2 study. Lancet Oncol. 2017 Jun;18(6):803-811. doi: 10.1016/S1470-2045(17)30246-2. Epub 2017 Apr 20. PMID 28434660
• RESULTMarur S, Li S, Cmelak AJ, Gillison ML, Zhao WJ, Ferris RL, Westra WH, Gilbert J, Bauman JE, Wagner LI, Trevarthen DR, Balkrishna J, Murphy BA, Agrawal N, Colevas AD, Chung CH, Burtness B. E1308: Phase II Trial of Induction Chemotherapy Followed by Reduced-Dose Radiation and Weekly Cetuximab in Patients With HPV-Associated Resectable Squamous Cell Carcinoma of the Oropharynx- ECOG-ACRIN Cancer Research Group. J Clin Oncol. 2017 Feb 10;35(5):490-497. doi: 10.1200/JCO.2016.68.3300. Epub 2016 Dec 28.