CD4 and posterior cortical atrophy: Moreover, preincubation of C4‐2/CWR22Rv1 cells with 10 μM S3i‐201, a STAT3 inhibitor, could abolish the CD4+ T cells capacity to increase PCa chemoresistance by Western blot analysis (Figure 5B), Tunel (Figure 6A), and CCK8 (Figure 6B).