PCR analysis of BM samples before and after BM purging (left) and after ABMT (right) in 101 informative patients with t(14;18). Patients were grouped according to follow-up BM PCR results. (A) Patients in whom all post-ABMT follow-up BM samples were PCR⁻. (B) Patients in whom all post-ABMT follow-up BM samples were PCR⁺. (C) Patients in whom all post-ABMT follow-up BM samples were both PCR⁺ and PCR⁻. (•) PCR⁺ results; (○) PCR⁻results; (⧫) relapse. Solid lines indicate continuous PCR⁺ results and shaded lines indicate continuously PCR⁻ results.