HSP90AA1 and squamous cell carcinoma: In 76 cases of squamous cell carcinoma, as shown in Figure 2A and Table 3, the AUC of Hsp90α combined with CYFRA21-1 was significantly higher than that of CYFRA21-1 alone (0.937, 95% CI: 0.900–0.963 vs. 0.858, 95% CI: 0.809–0.898, p = 0.0049).