ALB and squamous cell carcinoma: Gamma-glutamyltransferase also showed a potential positive causal relationship with squamous cell carcinoma (β: 0.241, P: 0.009, FDR: 0.072), while non-albumin exhibited a potential negative causal relationship with squamous cell carcinoma (β: -0.272, P: 0.020, FDR: 0.180).