Plasma Circulating Tumor DNA Sequencing Predicts Minimal Residual Disease in Resectable Esophageal Squamous Cell Carcinoma

Tao Liu, Qianqian Yao, Hai Jin, Tao Liu, Qianqian Yao, Hai Jin

Abstract

Esophageal squamous cell carcinoma (ESCC) is lethal as tumors are rarely detected at an early stage and have a high recurrence rate. There are no particularly useful biomarkers for the prognostic prediction of ESCC. Circulating tumor DNA (ctDNA) is becoming an important biomarker for non-invasive diagnosis and monitoring tumor prognosis. Here, we aimed to analyze variations in plasma cell-free DNA (cfDNA) amount to search for minimal residual disease (MRD). Plasma and white blood cells (WBCs) of 60 patients were collected before tumor resection and a week after surgery. Tumor specimens were also collected as formalin-fixed paraffin-embedded (FFPE) samples. All samples were extracted to analyze the genetic alterations of 61 genes using capture-based next-generation sequencing (NGS). Tumor variants were detected in 38 patients with ESCC, and the two driver genes with the highest mutation frequency were TP53 and PIK3CA. Of the pre-surgical plasma cfDNA samples, 73.7% of identified variants matched the tissue. In patients who did not receive adjuvant therapy after surgery, postoperative cfDNA-positive patients had shorter overall survival (hazard ratios (HR), 25.8; 95% CI, 2.7-242.6; P = 0.004) and were more likely to relapse than postoperative cfDNA-negative patients (HR, 184.6; 95% CI, 3.6-9576.9; P = 0.01). Detection of ctDNA after surgical tumor excision is associated with tumor relapse and disease-specific survival, and can be used as a prognostic biomarker for MRD detection in ESCC.

Keywords: circulating tumor DNA; esophageal squamous cell carcinoma; minimal residual disease; next-generation sequencing; prognostic marker.

Conflict of interest statement

QY was employed by Shanghai AccuraGen Biotechnology Co., Ltd. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Copyright © 2021 Liu, Yao and Jin.

Figures

Figure 1
Figure 1
Overview of patient enrollment and sample collection.
Figure 2
Figure 2
Somatic mutations in FFPE tissues of 53 patients with ESCC. (A) Gender, age, tumor location, tumor stage, and p53 IHC status of 53 patients. (B) Mutation landscape of FFPE samples. FFPE, Formalin-Fixed Paraffin-Embedded; ESCC, esophageal squamous cell carcinoma; IHC, immunohistochemistry.
Figure 3
Figure 3
Postoperative ctDNA mutation status and prognosis of patients with ESCC without adjuvant therapy. (A) Kaplan-Meier survival curves for DFS analysis between postoperative ctDNA+ and ctDNA- patients. (B) Kaplan-Meier estimates of OS according to postoperative ctDNA status in patients with ESCC without adjuvant chemotherapy. ESCC, esophageal squamous cell carcinoma; ctDNA, circulating tumor DNA; DFS, disease-free survival; OS, overall survival, NR, not reach.

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