CD5 and B-cell chronic lymphocytic leukemia: As sCr stabilized but did not decrease significantly, a third biopsy (day 281) was performed and revealed: (a) moderate interstitial fibrosis (20–30%), (b) no signs of rejection, and (c) absence of CLL-like B lymphocytes infiltration (PAX5-, CD5-, CD23-) (Figure 2C).