CD4 and angioimmunoblastic T-cell lymphoma: CD10 was less frequently positive (51%) than the other five TFH markers (86–92%) in AITL, while the frequency of CD10 was lower in nTFHL other than AITL (22%) and completely absent in PTCL-NOS, indicating that CD10 was, albeit not significantly, the most specific and least sensitive marker for AITL subtype as described previously (adjusted p = 0.23 and 0.08 for AITL vs. nTFHL other than AITL and AITL vs. CD4-positive PTCL-NOS, respectively, Fig. S22).