SPOCD1 and esophageal squamous cell carcinoma: Different bioinformatics analyses, including differential expression analysis, single nucleotide polymorphism (SNP)/copy number variation (CNV) analysis, drug sensitivity analysis, function analysis, pathway analysis, co-expression network analysis, immune cell infiltration analysis, and survival analysis, were carried out to comprehensively explored the potential molecular mechanisms and functional effects of SPOCD1 on the initiation and development of ESCC.