Why can sulphorhodamine-B assay (SRB assay) for preliminary anticancer screening not be done with HL-60 Cells?

I have observed that preliminary anticancer activity has been performed in most of the cases with SRB assay but when studies are carried out on HL-60 cells, only MTT is used. SRB is inhibitory and MTT is antiproliferative. Is there any specific characteristic of HL-60 cell lines which prohibit them from being used with SRB?