. 2002 May;4(2):81–89. doi: 10.1016/S1525-1578(10)60685-X

Table 5.

Effect of Using Additional FR Primers

FR primer	Number of laboratories (%)	True positives (%)	False positives (%)
FRIII only	8/17 (47%)	55/96 (57.3%)^*	6/91 (6.6%)^{^†^‡}
+ FRII	7/17 (41%)	64/87 (73.6%)^*	1/75 (1.3%)^{^†^‡}
+ FRI	1/17 (6%)	8/11 (72.2%)	2/8 (25%)
Not stated	1/17 (6%)	6/13 (46.2%)	0/10 (0%)
Totals	17/17 (100%)	147/232 (63.4%)	13/208 (6.3%)

Fractions reflect total number of tests positive/total number of tests performed by the participating laboratories, on all distributed material (DNA and paraffin-embedded). True positives, finding a monoclonal IgH gene rearrangement by PCR in B cell lymphomas; False positives, finding a monoclonal IgH gene rearrangement by PCR in T cell lymphomas.

P = 0.021.

P = 0.09.

P = 0.011.