GPC1 and AIDS dementia complex: Our results are concordant with the study conducted by Kai et al. (2021) that revealed strong positive expression of GPC1 in 100% of poorly differentiated lung SCC cases with scores of 3 + and 2 + in 96.8% and 3.2% of their cases, respectively, compared to score 1 + in only 3.3% of poorly differentiated ADC cases [27].