[Human cells for therapeutics purpose: State of the art]. / Cellules humaines à usage thérapeutique : état de la question.

Patient-derived induced pluripotent stem cells as well as human embryonic stem cells are pluripotent and their derivation has been used for the understanding of numerous diseases. Currently they are also used for the treatment of neurologic disorders such as Parkinson disease or cardiac disorders. Gene therapy has been successful for the treatment of hemophilia A and B, hemoglobinopathies and immunodeficiencies. Hemopoietic stem cell transplantation is a well-accepted therapeutic strategy for Leukemias, whereas CAR-T cells is a new promising approach even for lymphomas and myeloma.

A phase 2 trial of ponatinib in Philadelphia chromosome-positive leukemias.

BACKGROUND: Ponatinib is a potent oral tyrosine kinase inhibitor of unmutated and mutated BCR-ABL, including BCR-ABL with the tyrosine kinase inhibitor-refractory threonine-to-isoleucine mutation at position 315 (T315I). We conducted a phase 2 trial of ponatinib in patients with chronic myeloid leukemia (CML) or Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph-positive ALL). METHODS: We enrolled 449 heavily pretreated patients who had CML or Ph-positive ALL with resistance to or unacceptable side effects from dasatinib or nilotinib or who had the BCR-ABL T315I mutation. Ponatinib was administered at an initial dose of 45 mg once daily. The median follow-up was 15 months. RESULTS: Among 267 patients with chronic-phase CML, 56% had a major cytogenetic response (51% of patients with resistance to or unacceptable side effects from dasatinib or nilotinib and 70% of patients with the T315I mutation), 46% had a complete cytogenetic response (40% and 66% in the two subgroups, respectively), and 34% had a major molecular response (27% and 56% in the two subgroups, respectively). Responses were observed regardless of the baseline BCR-ABL kinase domain mutation status and were durable; the estimated rate of a sustained major cytogenetic response of at least 12 months was 91%. No single BCR-ABL mutation conferring resistance to ponatinib was detected. Among 83 patients with accelerated-phase CML, 55% had a major hematologic response and 39% had a major cytogenetic response. Among 62 patients with blast-phase CML, 31% had a major hematologic response and 23% had a major cytogenetic response. Among 32 patients with Ph-positive ALL, 41% had a major hematologic response and 47% had a major cytogenetic response. Common adverse events were thrombocytopenia (in 37% of patients), rash (in 34%), dry skin (in 32%), and abdominal pain (in 22%). Serious arterial thrombotic events were observed in 9% of patients; these events were considered to be treatment-related in 3%. A total of 12% of patients discontinued treatment because of an adverse event. CONCLUSIONS: Ponatinib had significant antileukemic activity across categories of disease stage and mutation status. (Funded by Ariad Pharmaceuticals and others; PACE ClinicalTrials.gov number, NCT01207440 .).

Multiple myeloma: the quality of care is linked to geographical and organisational determinants. A study in a French registry.

Multiple myeloma is a haematological malignancy whose care is spread over several specialities and provided by centres that various sizes, which raises the issue of equal opportunities in care access. Incident cases of myeloma between 2008 and 2010 were exhaustively identified by the Poitou-Charentes Cancer Registry. To ascertain the quality of care, the diagnosis, staging, and treatment administered were compared to international recommendations. Three hundred and sixty-seven patients were included. The diagnostic procedure exhibited 98% compliance, the staging 58%, and treatment 89%. Concerning diagnostic and staging, non-compliance with recommendations was associated to the failure to perform collegiate case assessments in multidisciplinary team (MDT) meetings [OR 2.15 (1.15-4.04)], care provided at a secondary centre, and a distance between home and the centre of 5-25 km [2.16 (1.06-4.40)] and 25-50 km [2.86 (1.37-6.01)]. Regarding treatment, non-compliance with recommendations was associated with care provided at a secondary centre [5.28 (2.03-13.75)]. Finally, diagnosis, staging and treatment quality improved over time. This study underlines the need to improve the organisation of the healthcare offer, so that patients can receive the best possible care. MDT seems to be the main means to improve quality of care.

No improvement of survival with reduced- versus high-intensity conditioning for allogeneic stem cell transplants in Ewing tumor patients.

BACKGROUND: Outcomes of Ewing tumor (ET) patients treated with allogeneic stem cell transplantation (allo-SCT) were compared regarding the use of reduced-intensity conditioning (RIC) and high-intensity conditioning (HIC) regimens as well as human leukocyte antigen (HLA)-matched and HLA-mismatched grafts. PATIENTS AND METHODS: We retrospectively analyzed data of 87 ET patients from the European Group for Blood and Marrow Transplantation, Pediatric Registry for Stem Cell Transplantations, Asia Pacific Blood and Marrow Transplantation and MetaEICESS registries treated with allo-SCT. Fifty patients received RIC (group A) and 37 patients received HIC (group B). Twenty-four patients received HLA-mismatched grafts and 63 received HLA-matched grafts. RESULTS: Median overall survival was 7.9 months [±1.24, 95% confidence interval (CI) 5.44-10.31] for group A and 4.4 months (±1.06, 95% CI 2.29-6.43) for group B patients (P = 1.3). Death of complications (DOC) occurred in 4 of 50 (0.08) and death of disease (DOD) in 33 of 50 (0.66) group A and in 16 of 37 (0.43) and 17 of 37 (0.46) group B patients, respectively. DOC incidence was decreased (P < 0.01) and DOD/relapse increased (P < 0.01) in group A compared with group B. HLA mismatch was not generally associated with graft-versus-Ewing tumor effect (GvETE). CONCLUSIONS: There was no improvement of survival with RIC compared with HIC due to increased DOD/relapse incidence after RIC despite less DOC incidence. This implicates general absence of a clinically relevant GvETE with current protocols.

European LeukemiaNet 2020 recommendations for treating chronic myeloid leukemia.

The therapeutic landscape of chronic myeloid leukemia (CML) has profoundly changed over the past 7 years. Most patients with chronic phase (CP) now have a normal life expectancy. Another goal is achieving a stable deep molecular response (DMR) and discontinuing medication for treatment-free remission (TFR). The European LeukemiaNet convened an expert panel to critically evaluate and update the evidence to achieve these goals since its previous recommendations. First-line treatment is a tyrosine kinase inhibitor (TKI; imatinib brand or generic, dasatinib, nilotinib, and bosutinib are available first-line). Generic imatinib is the cost-effective initial treatment in CP. Various contraindications and side-effects of all TKIs should be considered. Patient risk status at diagnosis should be assessed with the new EUTOS long-term survival (ELTS)-score. Monitoring of response should be done by quantitative polymerase chain reaction whenever possible. A change of treatment is recommended when intolerance cannot be ameliorated or when molecular milestones are not reached. Greater than 10% BCR-ABL1 at 3 months indicates treatment failure when confirmed. Allogeneic transplantation continues to be a therapeutic option particularly for advanced phase CML. TKI treatment should be withheld during pregnancy. Treatment discontinuation may be considered in patients with durable DMR with the goal of achieving TFR.

Enhancing tumor response to targeted chemotherapy through up-regulation of folate receptor α expression induced by dexamethasone and valproic acid.

Several folate-drug conjugates are currently undergoing clinical trials for application in oncology. However, the efficacy of folate-targeted therapy strongly depends on the folate receptor (FR) abundance at the surface of cancer cells. Recently, it has been postulated that up-regulation of FRα by means of chemo-sensitizing agents could enhance the anticancer activity of FR-drug conjugates. In this study, we demonstrate in vitro that a combination of dexamethasone (Dexa) and valproic acid (VPA) increases FRα expression selectively at the surface of FR-overexpressing cancer cells. The same stimulation was observed in vivo in KB-tumor xenografts when mice are treated with this combined treatment. This effect is reversible since treatment interruption induces the return of FR expression at basal level. When incubated with Dexa and VPA, the ß-galactosidase-responsive folate-monomethyl auristatin E (MMAE) conjugate, called MGAF, exhibits higher cytotoxic activity on several FR-positive human cancer cell lines, compared to its administration as a single agent. This improved toxicity results from the enhanced concentration of MMAE released within cancer cells after internalization and subsequent enzymatic activation of MGAF. Higher deposition of MMAE is also observed in vivo after up-regulation of FR expression level in tumor xenografts, induced by the prior administration of the Dexa/VPA combination. In this model, MGAF/Dexa/VPA combined therapy results in an 81% inhibition of tumor growth compared to the control group, while MGAF used in monotherapy is inefficient. Since Dexa and VPA are currently used in humans, this finding could be of great interest for further development of folate-drug conjugates, in particular for those that are presently under clinical investigation.

Imatinib mesylate is effective in children with chronic myelogenous leukemia in late chronic and advanced phase and in relapse after stem cell transplantation.

A multicentric phase 2 study was conducted to determine the efficiency and the tolerance of imatinib mesylate in children with chronic myelogenous leukemia (CML) in advanced phase of the disease, in relapse after stem cell transplantation, or in case of failure to an interferon alpha-based regimen. In all, 30 children from eight European countries were enrolled. In 18 children assessable for hematologic response, imatinib mesylate induced complete hematologic response in eight (80%) of the 10 patients included in chronic phase and in six (75%) of eight enrolled in advanced phase of the disease with acceptable toxicity. In 27 patients assessable for cytogenetic response, imatinib mesylate induced disappearance of Philadelphia chromosome-positive bone marrow cells in 12 (60%) of 20 children included in chronic phase and in two (29%) of seven included in advanced phase. A reduction of the bcr-abl/abl ratio to less than 10(-4) was achieved in 11 (50%) of the children included in chronic phase. Estimated 12-month overall survival rate was 95% (95% CI, 87-100%) for the patients included in chronic phase and 75% (95%CI, 45-100%) for those enrolled in advanced phase. Imatinib mesylate is well tolerated and molecular remission can be achieved in children with CML.

Mutation status and clinical outcome of 89 imatinib mesylate-resistant chronic myelogenous leukemia patients: a retrospective analysis from the French intergroup of CML (Fi(phi)-LMC GROUP).

The emergence of ABL point mutations is the most frequent cause for imatinib resistance in chronic myelogenous leukemia (CML) patients and can occur during any phase of the disease; however, their clinical impact remains controversial. In this study, we retrospectively analyzed the predictive impact of 94 BCR-ABL kinase domain mutations (18 T315I, 26 P-loop, 50 in other sites) found in 89 imatinib-resistant CML patients. At imatinib onset, 64% of patients (57/89) were in chronic phase (CP), 24% (21/89) in accelerated phase (AP) and 12% (11/89) in blastic phase (BP). T315I and P-loop mutations were preferentially discovered in accelerated phase of BP CML, and other types of mutations in CP (P=0.003). With a median follow-up of 39.2 months (6.3-67.2), since imatinib initiation, overall survival (OS) was significantly worse for P-loop (28.3 months) and for T315I (12.6 months), and not reached for other mutations (P=0.0004). For CP only, multivariate analysis demonstrated a worse OS for P-loop mutations (P=0.014), and a worse progression-free survival (PFS) for T315I mutations (P=0.014). Therefore, P-loop and T315I mutations selectively impair the outcome of imatinib-resistant CML patients, in contrast to other mutations, which may benefit from dose escalation of imatinib, able to improve or stabilize disease response.

Radioimmunotherapy-augmented BEAM chemotherapy vs BEAM alone as the high-dose regimen for autologous stem cell transplantation (ASCT) in relapsed follicular lymphoma (FL): a retrospective study of the EBMT Lymphoma Working Party.

Relapse remains the most common cause of treatment failure in patients receiving autologous stem cell transplantation (ASCT) for follicular lymphoma (FL). The aim of this study was to evaluate the effect of adding radioimmunotherapy or rituximab (R) to BEAM (carmustine, etoposide, ara-c, melphalan) high-dose therapy for ASCT in patients with relapsed FL. Using the European Society for Blood and Marrow Transplantation registry, we conducted a cohort comparison of BEAM (n=1973), Zevalin-BEAM (Z-BEAM) (n=207) and R-BEAM (n=179) and also a matched-cohort analysis of BEAM vs Z-BEAM including 282 and 154 patients, respectively. BEAM, Z-BEAM and R-BEAM groups were well balanced for age, time from diagnosis to ASCT and disease status at ASCT. The cumulative incidences of relapse (IR) at 2 years were 34, 34 and 32% for Z-BEAM, R-BEAM and BEAM, respectively. By multivariate analysis, there were no significant differences with Z-BEAM or R-BEAM compared with BEAM for IR, non-relapse mortality, event-free survival or overall survival. With the caveat that the limitations of registry analyses have to be taken into account, this study does not support adding radioimmunotherapy or R to BEAM in ASCT for relapsed FL. However, we cannot rule out the existence a particular subset of patients who could benefit from Z-BEAM conditioning that cannot be identified in our series, and this should be tested in a randomized trial.

Lenalidomide with or without erythropoietin in transfusion-dependent erythropoiesis-stimulating agent-refractory lower-risk MDS without 5q deletion.

After failure of erythropoiesis-stimulating agents (ESAs), lenalidomide (LEN) yields red blood cell (RBC) transfusion independence (TI) in 20-30% of lower-risk non-del5q myelodysplastic syndrome (MDS). Several observations suggest an additive effect of ESA and LEN in this situation. We performed a randomized phase III study in 131 RBC transfusion-dependent (TD, median transfusion requirement six RBC units per 8 weeks) lower-risk ESA-refractory non-del5q MDS. Patients received LEN alone, 10 mg per day, 21 days per 4 weeks (L arm) or LEN (same schedule) + erythropoietin (EPO) beta, 60,000 U per week (LE arm). In an intent-to-treat (ITT) analysis, erythroid response (HI-E, IWG 2006 criteria) after four treatment cycles (primary end point) was 23.1% (95% CI 13.5-35.2) in the L arm and 39.4% (95% CI 27.6-52.2) in the LE arm (P=0.044), while RBC-TI was reached in 13.8 and 24.2% of the patients in the L and LE arms, respectively (P=0.13). Median response duration was 18.1 and 15.1 months in the L and LE arms, respectively (P=0.47). Side effects were moderate and similar in the two arms. Low baseline serum EPO level and a G polymorphism of CRBN gene predicted HI-E. Combining LEN and EPO significantly improves erythroid response over LEN alone in lower-risk non-del5q MDS patients with anemia resistant to ESA.

High-dose salvage chemotherapy without bone marrow transplantation for adult patients with refractory Hodgkin's disease.

PURPOSE: For patients with Hodgkin's disease (HD) who do not achieve complete response (CR), who experience a relapse within the first year of CR, and for those who have two or more relapses, the outcome is poor. Salvage chemotherapy regimens at conventional doses produce a CR rate that ranges from 10% to 50% and a 5-year disease-free survival (DFS) between 10% and 25%. On the other hand, high-dose chemotherapy regimens given in combination with bone marrow transplantation (BMT) produce a CR rate that ranges from 40% to 80% and a 3-year DFS of approximately 40%. We report the 5-year results of a prospective study in patients with refractory HD who were treated with three courses of intensive chemotherapy without BMT. PATIENTS AND METHODS: Thirty-nine adult patients with refractory HD were treated with three courses of intensive chemotherapy. Each cycle of chemotherapy comprised vindesine 1 mg/m2/d in continuous intravenous (IV) infusion from day 1 to day 5; Adriamycin (doxorubicin; Roger Bellon Laboratories, Neuilly, France) 40 mg/m2/d in continuous IV infusion from day 1 to day 3; carmustine 140 mg/m2/d at day 3; etoposide 200 mg/m2/d from day 3 to day 5; and methylprednisolone 120 mg/m2/d from day 1 to day 5. After the third cycle of chemotherapy, irradiation (20 Gy) was performed whenever possible and depended on previous irradiation. RESULTS: At the end of the treatment, 31 patients (79%) were in CR. Among these patients, 10 relapsed after a median time of 3 months. The overall 5-year survival rate was 46%. The freedom from progression (FFP) and the freedom from treatment failure (FFTF) rates were 48% and 43%, respectively. The main toxicities were hematologic (neutropenia and thrombocytopenia) and digestive. Four patients died due to treatment-related complications (two from septic shocks, one from respiratory insufficiency, and one from posttransfusional AIDS). CONCLUSION: The results of this study seem to be comparable to those results obtained with high-dose chemotherapies with autologous BMT.

Mediastinal tumor size and response to chemotherapy are the only prognostic factors in supradiaphragmatic Hodgkin's disease treated by ABVD plus radiotherapy: ten-year results of the Paris-Ouest-France 81/12 trial, including 262 patients.

PURPOSE: To identify prognostic factors in 262 patients with supradiaphragmatic Hodgkin's disease (HD), clinical stages (CS) I and II, prospectively treated between 1981 and 1988 according to the Paris-Ouest-France (POF) 81/12 protocol by three 1-month cycles of doxorubicin, bleomycin, vinblastine, and dacarbazine plus methylprednisone (ABVD-MP) followed by subtotal nodal irradiation (RT). PATIENTS AND METHODS: The size of mediastinal tumor (MT) was measured in all patients: 66 did not have MT (NoMT); 105 had a small-size MT (SSMT), ie, mediastinal mass ratio (MMR) less than 0.33; 58 had a medium-size MT (MSMT), ie, MMR > or = 0.33 and less than 0.45; and 33 had a bulky MT (BuMT), ie, MMR > or = 0.45. All patients received three cycles (CS IA, one cycle only) of ABVD-MP; patients in partial remission (PR) or complete remission (CR) after chemotherapy (CT) received supradiaphragmatic RT (involved fields, 40 Gy; adjacent fields, 30 Gy) plus lumboaortic and splenic RT (30 Gy); patients not in CR or PR after CT received salvage CT. RESULTS: Two hundred seventeen patients (82.8%) entered CR after CT and 258 (98.5%) after RT. Ten-year freedom-from-progression (FFP) and survival rateswere 88.6% and 89.4%, respectively. According to univariate analysis, MT size and post-CT status were the only factors to influence both FFP and survival. For patients with NoMT or SSMT, those with MSMT, and those with BuMT, FFP rates were 94.1%, 87.0%, and 63.0% (P < .001), respectively, while corresponding survival rates were 92.6%, 87.2%, and 78.2% (P < .05). FFP rates were significantly different between the patients who achieved CR and those who did not achieve CR after CT: 94.6% versus 65.3% (P < .001); corresponding survival rates were 89.9% and 73.7% (P < .01). Multivariate analysis confirmed that MT size and post-CT status were the only two prognostic factors for FFP; for survival, the same two characteristics, as well as age (< 40 v > or = 40 years), significantly affected prognosis. We were thus able to identify three groups. The 33 patients (12.6%) with a BuMT had 10-year FFP and survival rates of 63.0% and 78.2%, respectively. Of 229 patients without BuMT, the 195 who attained CR after CT had an optimal prognosis (FFP, 96.6%; survival, 93.6%), while those who failed to achieve CR after CT had an intermediate prognosis (FFP, 68.8%; survival, 77.6%). CONCLUSION: These results demonstrate the independent impact on HD prognosis of tumor burden and post-CT status.

Granulocyte colony-stimulating factor after intensive consolidation chemotherapy in acute myeloid leukemia: results of a randomized trial of the Groupe Ouest-Est Leucémies Aigues Myeloblastiques.

PURPOSE: Ten years after the first clinical studies, the clinical impact of myeloid growth factors in acute myeloid leukemia is still unclear. One of the objectives of the Groupe Ouest-Est Leucémies Aigues Myeloblastiques (GOELAM) 2 trial was to evaluate the benefit of granulocyte colony-stimulating factor (GCSF) given only after the two courses of intensive consolidation chemotherapy (ICC) used to maintain complete remission (CR). PATIENTS AND METHODS: One hundred ninety-four patients who were in CR after induction treatment were randomly assigned to receive G-CSF (100 patients) or no G-CSF (94 patients) after two courses of ICC (ICC 1, high-dose cytarabine plus mitoxantrone; ICC 2, amsacrine plus etoposide). G-CSF (filgrastim) was administered from the day after chemotherapy until granulocyte recovery at a daily dose of 5 microg/kg. RESULTS: In the G-CSF group, the median duration of neutropenia (< 0.5 x 10(9)/L) was dramatically reduced, both after ICC 1 (12 v 19 days, P <.001) and after ICC 2 (20 v 28 days, P <.001). The median duration of hospitalization was also significantly shorter in the G-CSF group (24 v 27 days after ICC 1, P <.001; 29 v 34 days after ICC 2, P <. 001). The median duration of intravenous antibiotics was significantly reduced after ICC 1 and ICC 2, and the median duration of antifungal therapy was significantly reduced after ICC 1. However, the incidence of microbiologically documented infections, the toxic death rate, the 2-year disease-free survival, and the 2-year overall survival were not affected by G-CSF administration. Moreover, the median interval between ICC1 and ICC2 was reduced by only 2 days, and the number of patients undergoing ICC2 was not increased in the G-CSF arm. CONCLUSION: G-CSF should be administered routinely after ICC to reduce the duration of neutropenia and hospitalization. However, G-CSF did not seem to significantly increase the feasibility of this two-course program or modify overall outcome.

Detection of monosomy 7 and trisomies 8 and 11 in myelodysplastic disorders by interphase fluorescent in situ hybridization. Comparison with acute non-lymphocytic leukemias.

Cells from 50 patients with myelodysplastic syndrome (MDS) and 20 patients with acute non-lymphoblastic leukemia (ANLL) were studied by fluorescent in situ hybridization (FISH) using alphoid biotinylated probes to detect numerical chromosome 7, 8 and 11 aberrations in interphase nuclei. FISH data were compared with cytogenetic results. Both methods were in agreement in 25/50 MDS and 20/20 ANLL cases. Trisomy 11 was found neither by cytogenetic study nor by FISH. In 11 MDS patients the percentage of abnormal cells was higher by FISH than by classical cytogenetic analysis. FISH revealed monosomy 7 which was undetectable by karyotypic study in 5-22% cells from 15 MDS patients. It also allowed the identification of two small markers and a ring chromosome in two MDS cases. FISH hence appears to be useful for the detection of minor abnormal clones and is a convenient complement to conventional cytogenetic analysis in the study of MDS.

Identification of several genes differentially expressed during progression of chronic myelogenous leukemia.

The Bcr-Abl fusion protein plays a crucial role in the initiation and maintenance of chronic myelogenous leukemia (CML). However, additional events are necessary for the transition from the chronic phase to the terminal phase of the disease. To identify genes involved in the disease progression, we constructed a subtractive library from enriched K562 cell mRNA. We obtained 1084 cDNA clones. After a specific hybridization of these clones with a cDNA probe from either chronic phase or K562 cells, 43 clones which present a differential hybridization level have been selected. Among them, several clones corresponded to ribosomal protein genes showing an increased transcription level during the blast crisis. We observed variations in the expression of a cellular adhesion molecule, a laminin-binding protein. An increased transcription level of the MAZ gene has been shown in the terminal phase of the disease. This gene encodes a protein that regulates the transcription of myc.

Two additional cases of t dic(9:12) in acute lymphocytic leukemia (ALL): prognosis in ALL with dic(9:12).

We report two occurrences of dic(9;12) in acute lymphoblastic leukemia and review previous cases. Cases of dic(9;12) share common features with cases of 9p and 12p rearrangements, but prognosis seems particularly good in cases of dic(9;12). The persistence of a specific dicentric in stable clones is remarkable and points to unusual centromeric behavior and/or marked selective advantage of the anomaly.

Daunorubicin continuous infusion induces more toxicity than bolus infusion in acute lymphoblastic leukemia induction regimen: a randomized study.

We report the first randomized study assessing the efficacy and safety of daunorubicin (DNR) continuous infusion (CI) compared to the more conventional 30-min infusion (i.v.) in newly diagnosed adult acute lymphoblastic leukemia (ALL). Seventy-seven patients were initially randomized to receive either a 24-h CI DNR (60 mg/m2 days 2-4) (40 patients) or bolus DNR at the same dosage (37 patients) with vincristine (2 mg i.v. days 1, 8, 15) and oral prednisone (60 mg/m2 days 1-15), without hematopoietic growth factor support, as an induction regimen. The distribution of adverse prognostic factors was comparable in the two-induction arm. Acute toxicity was more important in the CI arm. Gram negative infection (9 vs 1 gram negative septicemia, P = 0.01) and infection-related deaths (6 vs 1 deaths, P = NS) occurred more frequently in the CI arm during the induction treatment than in the i.v. arm, leading to the study interruption. Neutropenia but not thrombopenia duration was significantly longer in the CI arm than in the i.v. arm (18 days vs 14 days, P > 0.05 and 16 days vs 12 days, P > 0.05, respectively). Despite a similar CR rate according to the method of DNR administration (68% in the CI DNR arm vs 76% in the i.v. arm after the first course), there was a trend toward higher freedom from relapse (FFR) after DNR CI (48% vs 28% in the i.v. arm at 5 years, P = NS), suggesting that despite this high toxicity, DNR CI may improve the CR quality and decrease further the residual disease.

Allogeneic bone marrow transplantation remains an efficient consolidation for adults with acute myeloid leukemia even when performed very soon after diagnosis (< 100 days). The SFGM (Société Française de Greffe de Moelle.

Allogeneic BMT is presently recognized as one of the reference anti-leukemic treatments for AML patients. It could be a very useful therapy in CR1 AML if it is efficient as an early form of consolidation after induction therapy. Later procedures may be of lesser importance since they concern a population which may have already been cured by chemotherapy. Alternatively it is not solved if very early BMT gives patients sufficient therapy and provides lower toxicity. To answer this question we analyzed data from the Société Française de Greffe de Moelle (SFGM) on a sub-group of patients according to the following criteria: (1) Allogeneic BMT carried out on patients with AML in CR1; (2) after January 1985; (3) conditioning with CyTBI; (4) GVHD prophylaxis with MTX-CsA; (5) interval between diagnosis and BMT < 100 days. Forty-two fulfilled all criteria. Age was 31 +/- 8 years and M/F ratio was 19/23. WBC at diagnosis were 36 +/- 49 x 10(9)/l and four patients needed two induction courses to achieve CR1. Median follow-up is now 51 (24-116) months. Twenty-two patients developed a grade > or = 2 acute GVHD. Early transplant mortality at 1 year is no higher than 14%. Two patients died of secondary malignancies at 3.5 and 6.5 years after BMT. Finally 5-year (and 7-year) probabilities for relapse, survival, leukemia and event-free survival are respectively 17% (17%), 71% (62%), and 71% (71%) and 68% (59%). These data indicate the feasibility of such an approach with low mortality and low relapse rates providing a good long-term outcome. This should prompt an invitation to initiate the search for an HLA-identical sibling when AML is diagnosed in a young patient eligible for allo-BMT.

Does BCR-ABL genomic rearrangement persist in CML patients in complete remission after interferon alpha therapy?

Cytogenetic, interphase fluorescent in situ hybridization (FISH) and RT-PCR methods were used to study minimal residual disease in peripheral blood stem cells collected for autografting in three chronic myeloid leukemia (CML) patients in sustained complete cytogenetic remission after treatment with interferon alpha (IFNalpha). Karyotypic analysis failed to reveal Ph-positive metaphases. FISH detected 9-16% nuclei with a BCR-ABL fusion gene, contrasting with RT-PCR, performed in two cases, which was negative in one case and weakly positive in the other. RT-PCR was also subsequently weakly positive in the third patient. This discrepancy suggests that the BCR-ABL genomic rearrangement persists unexpressed in quiescent cells. These preliminary results, which need to be confirmed in larger series, suggest that monitoring residual disease in CML should be performed both at DNA and RNA levels. Moreover, autografting following IFNalpha therapy should be considered with caution because of the persistence of the BCR-ABL genomic rearrangement in a sizeable proportion of the cells.

Cytogenetic heterogeneity in t(11;19) acute leukemia: clinical, hematological and cytogenetic analyses of 48 patients--updated published cases and 16 new observations.

We report on 16 cases of t(11;19) acute leukemia and review data of published observations: altogether updated data of 48 patients are analyzed. Four hematological groups could be distinguished: (i) 13 cases of acute lymphoblastic leukemia (ALL) of B lineage, mostly CD19+; (ii) eight cases of biphenotypic leukemia: CD19+ (most often) ALL but with simultaneous or inducible expression of differentiation marker of monocytic lineage. The B lineage and biphenotypic leukemias were predominantly found in female infants; (iii) four cases of T-ALL in children; and (iv) 23 acute non-lymphocytic leukemia (ANLL) cases generally of M4 or M5 subtype, predominantly in males. Cytogenetically, at least two subtypes were observed with possibly an identical breakpoint on 11q23 but discrete breakpoints on 19p: lymphoid, biphenotypic, and most congenital myeloid cases showed a distal breakpoint on 19p13 producing 11q- and 19p+ derivatives, while most older myeloid cases showed 11q+ and 19p- derivatives as a result of a more proximal breakpoint on 19p12 or p13.1. The latter type was clearly detected using R bands but barely visible using Q or G bands while the other translocation was easy to detect with G bands but could be missed with R bands. The white blood cell count is usually high in these t(11;19) acute leukemias and prognosis is poor, except for T-ALL cases.