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The Implications of E2A-PBX1 Positivity and Effect of Delayed Intensification Chemotherapy in t(1;19)-positive Childhood Acute Lymphoblastic Leukemia

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¼­Á¾Áø(Seo Jong-Jin) - ¿ï»ê´ëÇб³ ÀÇ°ú´ëÇÐ ¼­¿ïÁß¾Óº´¿ø ¼Ò¾Æ°úÇб³½Ç
±èÀºÁ¤(Kim Eun-Jung) - ¾Æ»ê»ý¸í°úÇבּ¸¼Ò
¹ÚÁØÀº(Park Jun-Eun) - ´Ü±¹´ëÇб³ ÀÇ°ú´ëÇÐ ¼Ò¾Æ°úÇб³½Ç
¼­À»ÁÖ(Seo Eul-Ju) - ¿ï»ê´ëÇб³ ÀÇ°ú´ëÇÐ ¼­¿ïÁß¾Óº´¿ø ÀÓ»óº´¸®°úÇб³½Ç
ÁöÇö¼÷(Chi Hyun-Sook) - ¿ï»ê´ëÇб³ ÀÇ°ú´ëÇÐ ¼­¿ïÁß¾Óº´¿ø ÀÓ»óº´¸®°úÇб³½Ç
¹®Çü³²(Moon Hyung-Nam) - ¿ï»ê´ëÇб³ ÀÇ°ú´ëÇÐ ¼­¿ïÁß¾Óº´¿ø ¼Ò¾Æ°úÇб³½Ç
±èÅÂÇü(Ghim Thae-T.) - ¿ï»ê´ëÇб³ ÀÇ°ú´ëÇÐ ¼­¿ïÁß¾Óº´¿ø ¼Ò¾Æ°úÇб³½Ç

Abstract

¸ñÀû: t(1;19) ¾ç¼º ¼Ò¾Æ ALL ȯÀÚÀÇ È­Çпä¹ý ¹× ÃßÀû°üÂû ±â°£ Áß E2A-PBX1 Àü»çü ¾ç¼º ¿©ºÎ¸¦ °Ë»öÇÏ¿© ¹Ì¼¼ÀÜÁ¸¾ÏÀÇ ÀÓ»óÀû ÀÇÀǸ¦ ¾Ë¾Æº¸°í, Áö¿¬°­È­¿ä¹ýÀÇ Àå±â»ýÁ¸À² Çâ»ó¿¡ ´ëÇÑ È¿°ú¸¦ È®ÀÎÇÏ°íÀÚ º» ¿¬±¸¸¦ ½ÃÇàÇÏ¿´´Ù.


¹æ¹ý: ¿°»öü °Ë»ç»ó t(1;19)ÀÌ ¹ß°ßµÇ¾ú°Å³ª RT-PCR·Î E2A-PBX1 Àü»çü°¡ °Ë»öµÈ 14·ÊÀÇ ¼Ò¾Æ ALL ȯ¾Æ¿¡¼­ ÈÄÇâÀû ¶Ç´Â ÀüÇâÀûÀ¸·Î °¢ Ä¡·á½Ã±â¿¡ ¿¬¼ÓÀûÀ¸·Î äÃëµÈ 56·ÊÀÇ °ñ¼ö ¶Ç´Â ¸»ÃÊÇ÷¾× °Ëü¸¦ ´ë»óÀ¸·Î E2A-PBX1 Àü»çüÀÇ RT-PCR ÁõÆøÀ» ½ÃÇàÇÏ¿³´Ù. Ç¥ÁØ Ä¡·á¹ý¿¡ Áö¿¬°­È­¿ä¹ýÀ» Ãß°¡ÇÏ¿© »ýÁ¸À² Çâ»óÀÇ È¿°ú¸¦ È®ÀÎÇÏ¿´´Ù.


°á°ú: t(1;19)ÀÌ ¹ß°ßµÈ 11·Ê¿Í ¿°»öü °Ë»ç°¡ È®ÀεÇÁö ¾ÊÀº 3·Ê¿¡¼­ E2A-PBX1 Àü»çü°¡ PCR·Î ÁõÆøµÈ 3·Ê°¡ ÀÖ¾ú´Ù. Áø´Ü½Ã Á¤Áß¿¬·ÉÀº 7¼¼¿´À¸¸ç ³²³àºñ´Â 8:6À̾ú´Ù. FAB ºÐ·ù»ó L1ÀÌ 11·Ê, L2°¡ 3·Ê¿´°í ¸é¿ªÇ¥ÇöÇü ºÐ·ù»ó Group ¥´°¡ 10·Ê, Group ¥³°¡ 2·Ê, Group ¥²°¡ 1·Ê¿´´Ù. ÇÙÇüºÐ¼®ÀÌ °¡´ÉÇß´ø 11·Ê Áß unbalanced der(19)t(1;19)ÀÌ 9·Ê(81.8%)À̾úÀ¸¸ç, balanced t(1;19)ÀÌ 2·ÊÀ̾ú´Ù. 14·ÊÀÇ È¯ÀÚ¿¡¼­ Ç×¾ÏÈ­Çпä¹ý ±â°£ Áß °¢±â ´Ù¸¥ 2~7 ½ÃÁ¡¿¡ ½ÃÇàÇÑ E2A-PBX1 Àü»çüÀÇ PCR ÁõÆø¿¡ ÀÇÇÑ MRD °Ë»öÀ¸·Î °üÇصµÀÔ Ç×¾ÏÈ­Çпä¹ý ÈÄ ¸ðµÎ Ç÷¾×ÇÐÀû ¿ÏÀü°üÇØ»óÅ°¡ µÇ¾úÀ¸³ª ÀÌ Áß 4·Ê´Â MRD°¡ °Ë»öµÇ¾ú°í ±Ã±ØÀûÀ¸·Î ¸ðµÎ Àç¹ßµÇ¾ú°Å³ª ÃßÀûºÒ´ÉÀÇ »óÅ°¡ µÇ¾ú´Ù. ÀûÇÕÇÑ Áö¿¬°­È­¿ä¹ýÀ» ½ÃÇà¹ÞÀº 12·Ê Áß 10·ÊÀÇ È¯ÀÚ°¡ Àå±â »ýÁ¸ÇØ ÀÖÀ¸¸ç À̵éÀÇ Æò±Õ ÃßÀû°üÂû ±â°£Àº 45.1°³¿ùÀ̾ú´Ù.


°á·Ð: E2A-PBX1 Àü»çü¿¡ ´ëÇÑ RT-PCR·Î MRD°Ë»öÀÌ °¡´ÉÇÏ¿´À¸¸ç °üÇصµÀÔ È­Çпä¹ý ÈÄÀÇ MRD °Ë»öÀÌ Àç¹ß°ú Àå±â»ýÁ¸ ¿¹Ãø¿¡ °¡Àå µµ¿òÀÌ µÇ¾úÀ¸¸ç ÀÌ ½Ã±âÀÇ MRD Á¸Àç´Â ºÒ·®¿¹Èĸ¦ ½Ã»çÇÏ¿´´Ù. ¶ÇÇÑ Áö¿¬°­È­¿ä¹ýÀÇ µµÀÔÀ¸·Î t(1;19)ÀÇ ºÒ·®¿¹ÈÄÀÎÀÚ È¿°ú¸¦ Á¦°ÅÇÒ ¼ö ÀÖÀ½À» È®ÀÎÇÏ¿´´Ù.
Purpose: We studied the E2A-PBX1 positivity in t(1;19)-positive childhood acute lymphoblastic leukemia (ALL) patients during chemotherapy and follow-up period to evaluate the clinical implications of minimal residual disease (MRD) and the effect of delayed intensification chemotherapy on long-term survival.


Methods: Fifty-six bone marrow or peripheral blood samples collected retrospectively or prospectively before or during chemotherapy from 14 childhood ALL patients who had t(1;19) or E2A-PBX1 transcript at initial diagnosis were studied for the presence of E2A-PBX1 by RT-PCR. All patients received delayed intensification chemotherapy regardless of standard prognostic grouping for childhood ALL to evaluate its effect on the improvement of long-term survival.


Results: There were 11 t(1;19)-positive cases documented by karyotyping and 3 E2A-PBX1 transcript-positive cases amplified by PCR from the initial bone marrow samples. There were 11 cases of FAB L1 and 3 cases of L2. Immunophenotypic classification revealed 10 cases of group ¥´, 2 cases of group ¥³, and 1 case of group ¥². Among 11 cases with documented karyotype, 9 cases (81.8%) had der(19)t(1;19) and the other 2 had balanced t(1;19). Fifty-six samples collected at 2 to 7 different time points of 14 patients revealed 4 cases of MRD immediately after completion of induction chemotherapy despite hematologic complete remission. Three of these cases relapsed eventually, and 1 was lost to follow-up. Among 12 cases who received adequate delayed intensificiation chemotherapy, 10 are alive in complete remission.


Conclusion: MRD detection by RT-PCR amplification of E2A-PBX1 transcript of induction chemotherapy was most informative for the prediction of long-term survival and relapse. The presence of MRD after completion of induction chemotherapy conferred poor prognosis. The addition of delayed intensification chemotherapy to standard chemotherapy regimen could abolish the adverse effect of t(1;19) in childhood ALL patients.

Å°¿öµå

E2A-PBX1, t(1, 19), Minimal residual disease, Childhood ALL, Chemotherapy
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Minimal residual disease (MRD) detection by RT-PCR amplification of E2A-PBX1 transcript of induction chemotherapy was most informative for the prediction of long-term survival and relapse.
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DOI
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ICD 03
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