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Advanced Multiparametric MRI Strategies for Tumor Restaging After Neoadjuvant Therapy in Locally Advanced Gastric
Ya-Jun Hou1, Zi-Tong Sang1, Qiong Li1
1Department of Radiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
Annals of Surgical Oncology
|February 3, 2025
Summary
Multiparametric MRI (mpMRI) accurately stages gastric cancer after neoadjuvant therapy (NAT). This advanced imaging helps identify good responders, guiding personalized treatment for better patient outcomes.
Area of Science:
- Radiology
- Oncology
- Medical Imaging
Background:
- Gastric cancer staging is crucial for treatment planning.
- Neoadjuvant therapy (NAT) is a common treatment for locally advanced gastric cancer.
- Accurate restaging after NAT is essential to assess treatment response and guide subsequent management.
Purpose of the Study:
- To evaluate the diagnostic accuracy of multiparametric magnetic resonance imaging (mpMRI) for restaging locally advanced gastric cancer after neoadjuvant therapy (NAT).
- To compare the performance of individual MRI sequences (T2WI, DWI, DCE) and the combined mpMRI protocol in T and N restaging.
- To assess the ability of mpMRI to differentiate good responders to NAT.
Main Methods:
- A prospective cohort of 70 gastric cancer patients undergoing NAT and surgery was enrolled.
- mpMRI, including T2WI, DWI, and DCE sequences, was performed post-NAT and pre-surgery.
- Four radiologists independently assessed radiologic T stage (yrT) and N stage (yrN), with inter-reader agreement quantified.
- Diagnostic accuracy was compared against pathologic T stage (ypT) and N stage (ypN) using McNemar tests.
Main Results:
- Inter-reader agreement was almost perfect for T restaging and substantial for N restaging.
- mpMRI showed superior accuracy for T restaging (0.586) compared to T2WI (0.432) (P < 0.05).
- mpMRI achieved an accuracy of 0.443 for N restaging and an AUC of 0.879 for differentiating ypT0-1 tumors.
Conclusions:
- Advanced mpMRI is a valuable tool for restaging gastric cancer after NAT.
- Accurate restaging with mpMRI aids in identifying good responders to neoadjuvant therapy.
- This capability has significant clinical implications for personalized treatment strategies and improved patient outcomes.
