The 30 ROC trial: Precision intra-treatment imaging guiding major radiation reduction in human papillomavirus related oropharyngeal cancer.

Authors

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Nancy Y. Lee

Memorial Sloan Kettering Cancer Center, New York, NY

Nancy Y. Lee , Eric Jeffrey Sherman , Heiko Schöder , Sean Matthew McBride , Yao Yu , Jung Kang , C. Jillian Tsai , Daphna Y. Gelblum , Jay Boyle , Bhuvanesh Singh , Marc Cohen , Jennifer R. Cracchiolo , Ian Ganly , Lara Dunn , Anuja Kriplani , James Vincent Fetten , Loren S. Michel , Richard J. Wong , David G. Pfister , Nadeem Riaz

Organizations

Memorial Sloan Kettering Cancer Center, New York, NY, Memorial Sloan-Kettering Cancer Center, New York, NY

Research Funding

U.S. National Institutes of Health
U.S. National Institutes of Health, Serra Mucositis Funds

Background: Our previously published proof-of-concept trial using functional imaging to select patient with human papillomavirus (HPV) oropharyngeal carcinoma (OPC) for radiation de-escalation showed promising results. Here we report the outcome of a larger validation trial using the same paradigm where select HPV+ OPC patients received a definitive dose of 30Gy concurrently with chemotherapy and were subsequently observed. Methods: The trial enrolled patients who had p16+, T0-2, N1-N2c, M0 OPC by AJCC 7th TNM. Patients were required to have resection of the primary site (negative margin not required) or core biopsy of lymph node if unknown primary. In addition to standard positron emission tomography (PET), a pre-radiation dynamic 18F-FMISO (fluoromisonidazole) PET was performed to identify hypoxia in gross nodal disease. Patients with evidence of hypoxia ( > 1.2 tumor to muscle standard uptake value on 18F-FMISO) underwent repeat18F-FMISO PET around 2 weeks into radiation. Patients without pre-radiation hypoxia or with resolution of hypoxia on 18F-FMISO PET received 30Gy with 2 cycles of concurrent chemotherapy (cisplatin 100mg/m2 or carboplatin AUC 1.25 x 4 with 5-fluorouracil 2400 mg/m2). Results: From 11/2/17-1/4/21, 158 HPV+ OPC patients consented and were enrolled on trial. Patient characteristics were as follows: male (90%); ages 36-80 years; T-stage T0(26), T1(77), T2(55); N stage N1(19), N2a(15), N2b(95), N2c(29). Of the 114 patients with pre-treatment hypoxia, 24 had persistent hypoxia and received 70Gy. 128 patients were de-escalated to 30Gy and chemotherapy (86% cisplatin). 6 patients withdrew from trial [3 decided to receive standard of care; 3 refused 18F-FMISO PET]. Acute mucositis rates were 11% grade 0, 59% grade 1, and 30% grade 2, respectively. Acute xerostomia rates were 92% grade 1 and 8% grade 2, respectively. Weight loss was infrequent and only 19% complained of grade 1 and 5% complained of grade 2 weight loss. Six patients experienced grade 3 adverse events (diarrhea (2), syncope (2), vasovagal (1), dysphagia (1)). No patients required PEG tubes. With a median follow-up is 12 months (range: 2 months to 40 months), the 1-year locoregional control, distant metastasis-free overall survival rates were 94%, 100%, and 100%, respectively. Among the 30Gy de-escalated patients, none failed in the primary site. 8 patients had recurrent nodal disease underwent successful salvage surgery of which no additional therapy was given to 4 patients. Conclusions: Major de-escalation to 30Gy using patient specific treatment response based on hypoxia resolution resulted in excellent locoregional control with significant toxicity reduction. Updated results along with detailed correlative analysis will be presented. Clinical trial information: NCT03323463

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Abstract Details

Meeting

2021 ASCO Annual Meeting

Session Type

Poster Discussion Session

Session Title

Head and Neck Cancer

Track

Head and Neck Cancer

Sub Track

Local-Regional Disease

Clinical Trial Registration Number

NCT03323463

Citation

J Clin Oncol 39, 2021 (suppl 15; abstr 6019)

DOI

10.1200/JCO.2021.39.15_suppl.6019

Abstract #

6019

Abstract Disclosures