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Open-Access Journal
Review
Thais Gagno Grillo, Ana Elisa Valencise Quaglio, Rodrigo Fedatto Beraldo, Talles Bazeia Lima, Julio Pinheiro Baima, Luiz Claudio Di Stasi, Ligia Yukie Sassaki 
World J Gastrointest Oncol 13(9):995-1016. Published online Sep 15, 2021. doi: 10.4251/wjgo.v13.i9.995
Elías Martínez-López, Aleix Martínez-Pérez, Sergio Navarro-Martínez, Juan Carlos Sebastián-Tomás, Nicola de'Angelis, Eduardo García-Granero 
World J Gastrointest Oncol 13(9):1029-1042. Published online Sep 15, 2021. doi: 10.4251/wjgo.v13.i9.1029
Minireviews
Francisco Javier Pérez Lara, Maria Luisa Hebrero Jimenez, Francisco Javier Moya Donoso, Jose Manuel Hernández Gonzalez, Maria Pitarch Martinez, Tatiana Prieto-Puga Arjona 
World J Gastrointest Oncol 13(9):1062-1072. Published online Sep 15, 2021. doi: 10.4251/wjgo.v13.i9.1062
Basic Study
Retrospective Study
Fei-Long Ning, Nan-Nan Zhang, Jun Wang, Yi-Feng Jin, Hong-Guang Quan, Jun-Peng Pei, Yan Zhao, Xian-Tao Zeng, Masanobu Abe, Chun-Dong Zhang 
World J Gastrointest Oncol 13(9):1184-1195. Published online Sep 15, 2021. doi: 10.4251/wjgo.v13.i9.1184
Meta-Analysis
Letter to the Editor