请检查下面这段话的检查语法错误进行修改和润色修改部分要标注出来：Besides a combination of these circulating immune cells including platelet-to-lymphocyte ratio PLR neutrophil-to-lymphocyte ratio NLR and systemic immunity-inflammation

Besides, a combination of circulating immune cells, including the platelet-to-lymphocyte ratio (PLR), neutrophil-to-lymphocyte ratio (NLR), and systemic immunity-inflammation index (SII) has been defined as stable new inflammatory biomarkers to assess local systemic inflammation. These biomarkers have been found to be useful in predicting cancer occurrence and development [19]. Several studies have provided evidence of the associations between NLR and PLR and gestational diabetes mellitus (GDM), but inconsistent results have been observed (20-24). Most of these studies had a sample size of less than a thousand, which may be one possible reason for the inconsistent results [25].