Supplementary Material for: AKAP12 and IGFBP4 are prognostic factors for chronic lymphocytic leukemia

Introduction: To develop a prognostic model for chronic lymphocytic leukemia (CLL).
Methods: GEO2R was used to retrieve the gene expression data of CLL and normal B cells from the Gene Expression Omnibus (GEO, GSE22529 and GSE50006 datasets) database. Perl (Practical Extraction and Report Language) was used to extract the gene expression and overall survival (OS) data of CLL patients from the CLLE-ES project in the ICGC (International Cancer Genome Consortium) database. Cox regression with Lasso was used to create and validate a prognostic model for CLL.
Results: A total of 267 genes exhibited differential expression between CLL and normal B cells. Uni-Cox analysis identified 14 DEGs that correlated with overall survival (OS). Lasso multivariate evaluation demonstrated that AKAP12 and IGFBP4 are independent prognostic factors for CLL. Kaplan-Meier survival analysis revealed a significant association between the estimated risk score and survival. The area under the receiver operating characteristics (ROC) curve (AUC) was calculated to be 0.97, indicating high predictive accuracy. In addition, high AKAP12 and IGFBP4 risk score was associated with the high incidence of trisomy 12q.
Conclusion: Taken together, AKAP12 and IGFBP4 are independent prognostic factors for CLL.

引言：本研究旨在构建慢性淋巴细胞白血病（chronic lymphocytic leukemia, CLL）的预后模型。
研究方法：采用GEO2R工具从基因表达综合数据库（Gene Expression Omnibus, GEO，包含GSE22529与GSE50006数据集）中检索慢性淋巴细胞白血病与正常B细胞的基因表达数据；采用Perl（Practical Extraction and Report Language，实用提取与报告语言）从国际癌症基因组联盟（International Cancer Genome Consortium, ICGC）数据库的CLLE-ES项目中提取慢性淋巴细胞白血病患者的基因表达与总生存期（overall survival, OS）数据；采用结合Lasso正则化的Cox回归模型构建并验证慢性淋巴细胞白血病的预后模型。
研究结果：共筛选得到267个在慢性淋巴细胞白血病与正常B细胞间存在差异表达的基因；单因素Cox回归分析筛选出14个与总生存期相关的差异表达基因；Lasso多因素回归分析显示，AKAP12与IGFBP4为慢性淋巴细胞白血病的独立预后因素；卡普兰-迈耶（Kaplan-Meier）生存分析显示，预测风险评分与患者生存状况存在显著关联；受试者工作特征曲线（receiver operating characteristic curve, ROC）下面积（area under the curve, AUC）经计算为0.97，表明模型具有较高的预测准确性；此外，AKAP12与IGFBP4高风险评分与12号染色体长臂三体的高发生率显著相关。
研究结论：综上，AKAP12与IGFBP4为慢性淋巴细胞白血病的独立预后因素。