Table 3.

Comparison of Ancillary Testing Between Subgroups^a

Ancillary test	IH (N=100)	CRb (N=100)	PRb (N=100)	P value
				Overall	IH vs CR	IH vs PR	CR vs PR
No. of IHC stains, mean	1.5	2.8	4.8	<.001	.003	<.001	.008
With ancillary testing (%)
Flow cytometry	73	83	90	.007	.09	.002	.15
IHC	48	69	63	.008	.003	.03	.37
Cytogenetics/karyotype	37	72	54	<.001	<.001	.02	.008
FISH	23	44	31	.006	.002	.20	.06
NGS	2	2	3	.86	>.99	.65	.65
Other molecular	15	19	17	.75	.45	.70	.71

^aCR = clinically referred; IH = in-house; IHC = immunohistochemistry; FISH = fluorescence in situ hybridization; NGS = next-generation sequencing; PR = pathologist referred.

^bThe CR and PR ancillary studies by both outside and Mayo Clinic pathologists included.