Grey bars: prediction with complete sets. The “Relative” set comprised the relative values of CD15+, CD68+, CD3+, CD20+, or CD38+ cells. The set “Relative + TIC” comprises the “Relative” set plus total inflammatory cells (TIC, sum of absolute expression values of all five markers). The “Absolute” set comprised absolute densities (cells/mm2) of cells expressing CD15+, CD68+, CD3+, CD20+, or CD38+ cells. The set “Absolute + TIC” comprised the “Absolute” set plus TIC. Black bars: wrapper-predicted subsets of markers. “Relative”: relative densities of CD15+, CD38+, or CD68+ cells. “Relative + TIC” relative densities of CD15+ or CD68+ cells, plus TIC. Both the “Absolute” and “Absolute + TIC” sets comprised absolute values of CD15+, CD38+, or CD68+ cells. Abbreviation: TIC, total inflammatory cells.