The article "Changes of Serum Insulin-like Growth Factor-2 Response to Negative Symptom Improvements in Schizophrenia Patients Treated with Atypical Antipsychotics", written by Xue-lin CHAO, Shu-zhen JIANG, Jian-wen XIONG, Jin-qiong ZHAN, Bo WEI, Chun-nuan CHEN, Yuan-jian YANG was originally published electronically on the publisher's internet portal on June 2020 without open access. This evidence concerns the gene IGF2 and schizophrenia.