Based on correlation analysis between PDC6IP and 83 MTEX proteins differentiating melanoma patients with PD from those with NED/SD, we found four proteins that strongly (ru > 0.7, P < 0.005) associated with PDC6IP, namely HSP90AB1, PFN1, TUBB, and TUBB1 (Figure S5). This evidence concerns the gene HSP90AB1 and melanoma.