Correlation between RNA and protein expression of cyclin B1 and cyclin A in follicular lymphomas. RNA expression for CCNB1 was measured by probe set 34736_at and for CCNA2 by probe set 1943_at. The percentages of cyclin B1-positive cells (top) and cyclin A-positive cells (bottom) with immunohistochemistry were calculated with the hot-spot method (see “Patients, materials, and methods”). Correlation coefficient between RNA and protein for cyclin B1 was 0.67 (P value, 1 × 10^-7) and for cyclin A, 0.63 (P value, 2 × 10^-7).