GGPS1 and cancer: We observed a significant negative correlation between GGPS1 expression and immune infiltration in three cancer species: STES (N = 569, R = 0.21, p = 6.4 × 107), STAD (N = 388, R = 0.16, p = 1.2 × 103), and ESCA (N = 181, R = 0.21, p = 4.1 × 103), but in CHOL (N = 36, R = 0.23, p = 0.18) there was no statistical significance.