PTBP1 expression is positively correlated (r = 0.3013, p < 0.0001, Figure 2(f)) with myeloma cell proliferation in 246 bortezomib-treated MM patients available at the GSE9782 dataset, using the global gene expression-based proliferation index (GPI) of MM originated by Mayo Clinic as proxy of actual myeloma cell proliferation [31]. The gene discussed is PTBP1; the disease is plasma cell myeloma.