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Selection and Validation of Chemotherapy Beneficiaries Among Elderly Nasopharyngeal Carcinoma (NPC) Patients Treated with Intensity-modulated Radiation Therapy (IMRT): a Large Real-world Study

Overview
Journal Radiat Oncol
Publisher Biomed Central
Specialties Oncology
Radiology
Date 2022 Aug 8
PMID 35941674
Authors
Affiliations
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Abstract

Purpose: Using real-world evidence, this study aimed to identify elderly nasopharyngeal carcinoma (NPC) patients who would benefit from chemotherapy.

Methods And Materials: 1714 elderly NPC patients between April 2007 and December 2017 were identified. Recursive partitioning analysis (RPA) was used to generate risk-stratified outcomes. Prognostic factors were performed for individual comparisons of different risk groups to assess chemotherapy benefits.

Results: The median follow-up was 59.3 (0.39-170.09) months. Epstein Barr virus (EBV) DNA and T stage were included in the RPA-generated risk stratification, categorizing patients into a good-prognosis group (EBV DNA ≤ 4000 copies/mL & T1-2), and a poor-prognosis group (EBV DNA ≤ 4000 copies/mL & T3-4 and EBV DNA > 4000 copies/mL & any T). Overall survival (OS) was significantly higher in the good-prognosis group compared with the training set (HR = 0.309, 95% CI 0.184-0.517; P < 0.001), and validated in the testing set (HR = 0.276, 95% CI 0.113-0.670; P = 0.002). In the poor-prognosis group, a significantly improved OS for chemoradiotherapy (CRT) compared with RT alone was observed (HR = 0.70, 95% CI 0.55-0.88; P = 0.003). Patients who received induction chemotherapy (IC) + concurrent chemoradiotherapy (CCRT) and CCRT had a significantly improved OS compared with RT alone (IC + CCRT vs. RT alone: P = 0.002; CCRT vs. RT alone: P = 0.008) but not in the IC + RT group (P = 0.306). The 5-year OS for CRT versus RT-alone with ACE-27 scores of 0, 1 and 2 were 76.0% versus 70.0% (P = 0.014), 80.5% versus 68.2% (P = 0.150) and 58.5% versus 62.2% (P = 0.490), respectively; for those aged 60-64, 65-70 and ≥ 70 years old they were 80.9% versus 75.9% (P = 0.068), 73.3% versus 63.4% (P = 0.270) and 64.8% versus 67.1% (P = 0.820), respectively.

Conclusions: For elderly NPC patients a simple screening cutoff for chemotherapy beneficiaries might be EBV DNA < 4000 copies/ml & T3-4 and EBV DNA ≥ 4000 copies/ml & any T, but not for those > 70 years old and with an ACE-27 score > 1. IC + CCRT and CCRT were effective forms of chemotherapy.

Citing Articles

Prognostic model on overall survival in elderly nasopharyngeal carcinoma patients: a recursive partitioning analysis identifying pre-treatment risk stratification.

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PMID: 37353800 PMC: 10290415. DOI: 10.1186/s13014-023-02272-x.


The role of Epstein-Barr virus in nasopharyngeal carcinoma.

Su Z, Siak P, Leong C, Cheah S Front Microbiol. 2023; 14:1116143.

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