a, Cells from patients with known genetic and molecular
profiles were stained with conjugated NKG2D–Fc chimeric protein and
included in the analyses. Numbers of patients with positive or negative
results for the respective mutation are shown below each analysis; patients
with an unknown result for the particular analysis are not shown. Note that
cases of AML that belong to the favourable molecular European LeukaemiaNet
(ELN) risk group or with detectable inv(16) showed higher expression of
NKG2DLs when compared to AML of other risk groups or without inv(16). For
statistical analyses, a Kruskal–Wallis test was used for karyotype
and ELN 2017 risk group, and a Mann–Whitney U test
for all other data. b–e, Surface expression
of NKG2DLs assessed at diagnosis (b) was compared between
patients who achieved or did not achieve complete remission (CR) or complete
remission with incomplete haematologic recovery (CRi) after induction
chemotherapy (c), as well as between those patients
who—after achieving complete remission (both with and without
incomplete haematologic recovery)—did or did not experience
subsequent relapse (d). Patients with initial high percentages
of NKG2DL+ cells among total AML cells more often
achieve—and, by trend, also sustain—remission. A
Mann–Whitney U test was used for statistical
analysis. a, c, d, Boxes indicate the
median and interquartile range, and whiskers represent data up to 1.5
× the interquartile range; outliers that range from 1.5–3
× the interquartile range are depicted as circles. In e,
patients with high (n = 75) versus low (n
= 75) expression of NKG2DLs (left), and patients with ≥80%
NKG2DL+ (n = 24) versus ≥ 80%
NKG2DL−(n = 56) cells among total AML
cells (right) were compared with respect to overall survival. Note that when
only patients younger than 65 years are included, improved survival is
observed in cases with ≥80% NKG2DL+ compared to
≥80% NKG2DL− cells among total AML cells (as shown
in Fig. 1p). For survival analyses, the log-rank (Mantel–Cox) test
was used for statistical analyses. For all other tests, two-sided
statistical tests were used.