Table 2.

Overall Results of IgH PCR

B cell lymphomas*	T cell lymphomas
Positive result	147 /232 (63.4%)	13 /208 (6.3%)
Follicular lymphomas	91 /165 (55.2%)
Non-follicular lymphomas	56 /67 (83.6%)

Data reflect all samples analyzed, both DNA specimens and paraffin-embedded tissues. Denominators are the total numbers of specimens successfully tested. All B cell lymphomas were positive by IgH SBA, while all T cell lymphomas were negative by IgH SBA.

No single laboratory scored 100% on all B cell lymphoma samples. The best performing laboratory scored 92% while the worst performing scored 20%.

11 of the 19 laboratories scored a perfect 0% false positive rate.

P < 0.0001. Unlike this disease category difference in the B cell lymphomas, no such stratification was noted among the types of T cell lymphoma.