Leukocyte count as a predictor of death during remission induction in acute myeloid leukemia.

Acute myeloid leukemia (AML) presenting with a high leukocyte count has been associated with an increase in induction mortality and poor results in a number of other survival measures. However, the level at which an elevated leukocyte count has prognostic significance in AML remains unclear. In this report on a series of 375 adult (non-M3) AML patients undergoing induction chemotherapy at a single institution, leukocyte count analyzed as a continuous variable is shown to be a better predictor of induction death (ID) and overall survival (OS) than a leukocyte count of > or = 100 x 10(9)/L, a value characteristically associated with "hyperleukocytosis" (HL). In this patient cohort, a presenting leukocyte count of > or = 30 x 10(9)/L had high sensitivity and specificity for predicting ID, and both performance status (PS) and leukocyte count more accurately predicted for ID than age. Considering these parameters in newly-diagnosed AML patients may facilitate the development of strategies for reducing induction mortality.

Busulfan, cyclophosphamide, and melphalan conditioning for autologous bone marrow transplantation in hematologic malignancy.

Sixteen patients with poor-prognosis acute myelogenous leukemia (AML), acute lymphoblastic leukemia (ALL), and non-Hodgkin's lymphoma (NHL) underwent conditioning with busulfan (16 mg/kg) and cyclophosphamide (120 mg/kg) (BUCY-2) plus melphalan (90 or 135 mg/m2) and autologous bone marrow transplantation (AuBMT) in a phase I study. At the melphalan dose of 90 mg/m2, grade greater than or equal to 3 regimen-related toxicity (RRT) was observed in five patients (31%; 95% confidence interval [CI], 11% to 59%), with hepatic (venoocclusive disease [VOD]) and urinary (hemorrhagic cystitis) RRT being the most frequent complications. Further escalation of the melphalan dose to 135 mg/m2 was deemed excessively toxic, as three of five patients had grade greater than or equal to 3 RRT. Following this experience, 21 patients with multiple myeloma (MM) and chronic myelogenous leukemia (CML) were treated with BUCY-2 plus melphalan 90 mg/m2 and AuBMT in separate studies. Three of these patients--all with extensively pretreated MM--had grade greater than or equal to 3 RRT (14%; 95% CI, 3% to 36%); no others had grade greater than or equal to 3 RRT. Therefore, a total of eight of the 37 patients (22%; 95% CI, 10% to 38%) who received BUCY-2 plus melphalan 90 mg/m2 conditioning developed grade greater than or equal to 3 RRT; three of these patients (8%; 95% CI, 3% to 25%) died of RRT. Although limited by the relatively small number of patients, our analysis of the patients receiving this regimen showed that the presence of parameters denoting the lymphoid diagnostic group (ie, ALL, NHL, and MM), more extensive pretreatment, and/or more advanced disease status were associated with a higher incidence of grade greater than or equal to 3 RRT. Response data on the AML, ALL, and NHL patients who received BUCY-2 plus melphalan 90 mg/m2 were analyzed: three patients (all with AML in first or second remission) are leukemia-free at 3.0, 2.8, and 1.4 years after AuBMT. The actuarial 2-year event-free survival in this group is 17% (95% CI, 5% to 54%). Response data on the MM and CML patients will be reported subsequently. BUCY-2 plus melphalan at a dose of 90 mg/m2 before AuBMT produces acceptable toxicity in patients who are not heavily pretreated. A full evaluation of the antineoplastic effects of this regimen requires further study.

Regimen-related toxicity of a busulfan-cyclophosphamide conditioning regimen in 70 patients undergoing allogeneic bone marrow transplantation.

The regimen-related toxicity (RRT) of a busulfan (16 mg/kg) and cyclophosphamide (120 mg/kg) conditioning regimen (BuCy) was evaluated in 70 consecutive patients undergoing allogeneic bone marrow transplantation for hematologic malignancies. Patients were given toxicity gradings retrospectively in each of eight organ systems (cardiac, bladder, renal, pulmonary, hepatic, CNS, stomatic, and gastrointestinal) according to a recently developed RRT scale. A set of patient, disease, and treatment parameters (age, sex, diagnosis, Eastern Cooperative Oncology Group [ECOG] score, preconditioning liver function tests [LFT], prior chemotherapy exposure, disease status, graft-versus-host disease [GVHD] prophylaxis, antimicrobial agent use, hematologic recovery, and severity of acute GVHD) was statistically analyzed to determine significant predictors of RRT. The most common significant organ toxicities were stomatic (87% of patients; 63% grades II to IV) and hepatic (83% of patients; 44% grades II to IV). Renal and gastrointestinal toxicities were not uncommon (35% and 27%, respectively) but were rarely serious (9% and 1% grades II to IV, respectively). Twelve patients developed grade III toxicities of the following systems: hepatic (seven), pulmonary (two), bladder (two), and CNS (one). Females had more frequent stomatitis (P = .04) and hepatic RRT (P = .004). Patients receiving methotrexate in their GVHD prophylactic regimen experienced more grade II to IV stomatitis (P = .04) and hepatic RRT (P = .04). The use of amphotericin B (P = .01) or prolonged antibiotic courses (P = .04) was associated with more grades II to IV hepatic RRT. In a multivariate analysis, only amphotericin B administration predicted grades II to IV hepatic RRT (P = .01). The incidence of acute GVHD was 49%, with 31% having grades II to IV GVHD. The estimated 2-year event-free survival (EFS) for the entire study group was 44%. The estimated 2-year EFS was 63% for standard-risk patients (acute leukemia in first remission and chronic myelogenous leukemia [CML] in first stable phase) and 24% for all others (high-risk patients). High-risk patients were at increased risk of disease recurrence and RRT. BuCy is an efficacious bone marrow transplant conditioning regimen for standard-risk patients with leukemia but has significant associated hepatic RRT.

Myeloablative allografting for chronic lymphocytic leukemia: evidence for a potent graft-versus-leukemia effect associated with graft-versus-host disease.

In all, 30 patients with CLL proceeded to myeloablative allogeneic BMT using related (n=20, 67%) or unrelated (n=10) donors, at the Princess Margaret Hospital (Toronto) (n=20) or the Leukemia/BMT Program of BC (Vancouver) (n=10), from 1989 to 2001. Median (range) interval from diagnosis to BMT was 4.8 (0.3-13) years, median number of prior therapies was three and median age 48 years. The preparative regimen included total body irradiation in 15 (50%). In all, 14 of 30 patients (47%) are alive, with median (range) follow up of 4.3 (2.4-10.5) years. All are in complete remission, two following therapy for post-BMT progression. Actuarial overall (OS) and event-free survival (EFS) at 5 years is 39% (OS 48% for related donor and 20% for unrelated donor BMT); cumulative incidence of nonrelapse mortality (NRM) and relapse is 47 and 19%, respectively. Both acute (RR=0.008, P=0.01) and chronic (RR=0.006, P=0.02) Graft-versus-host disease (GVHD) were associated with markedly decreased risk of relapse. Patients receiving grafts from unrelated donors had increased NRM (RR=3.6, P=0.02) and decreased OS (RR of death=3.4, P=0.002). Allogeneic BMT has resulted in long-term EFS in approximately 40% of patients with CLL. There is evidence for a strong graft-versus-leukemia effect associated with acute and chronic GVHD, resulting in near complete protection from relapse.

The relationship of TP53 R72P polymorphism to disease outcome and TP53 mutation in myelodysplastic syndromes.

Nonsynonymous TP53 exon 4 single-nucleotide polymorphism (SNP), R72P, is linked to cancer and mutagen susceptibility. R72P associations with specific cancer risk, particularly hematological malignancies, have been conflicting. Myelodysplastic syndrome (MDS) with chromosome 5q deletion is characterized by erythroid hypoplasia arising from lineage-specific p53 accumulation resulting from ribosomal insufficiency. We hypothesized that apoptotically diminished R72P C-allele may influence predisposition to del(5q) MDS. Bone marrow and blood DNA was sequenced from 705 MDS cases (333 del(5q), 372 non-del(5q)) and 157 controls. Genotype distribution did not significantly differ between del(5q) cases (12.6% CC, 38.1% CG, 49.2% GG), non-del(5q) cases (9.7% CC, 44.6% CG, 45.7% GG) and controls (7.6% CC, 37.6% CG, 54.8% GG) (P=0.13). Allele frequency did not differ between non-del(5q) and del(5q) cases (P=0.91) but trended towards increased C-allele frequency comparing non-del(5q) (P=0.08) and del(5q) (P=0.10) cases with controls. Median lenalidomide response duration increased proportionate to C-allele dosage in del(5q) patients (2.2 (CC), 1.3 (CG) and 0.89 years (GG)). Furthermore, C-allele homozygosity in del(5q) was associated with prolonged overall and progression-free survival and non-terminal interstitial deletions that excluded 5q34, whereas G-allele homozygozity was associated with inferior outcome and terminal deletions involving 5q34 (P=0.05). These findings comprise the largest MDS R72P SNP analysis.

Allogeneic hematopoietic stem cell transplantation for progressive follicular lymphoma.

Between 1993 and 2000, 24 patients with follicular lymphoma underwent high-dose chemo/radiotherapy and allogeneic hematopoietic stem cell transplantation (HSCT). Median age was 44 years, median interval from diagnosis to HSCT was 24 months and the median number of prior lines of treatment was three. Donor source was HLA matched sibling (23) or matched unrelated donor (one). Conditioning therapy was busulfan based in 22 patients and included total body irradiation in two. All patients received i.v. cyclosporine A and short-course methotrexate for GVHD prophylaxis. Nineteen patients are alive, a median of 2.3 years post HSCT. Death occurred due to transplant complications in four patients and one patient died of a stroke 10 months post HSCT. No patients have relapsed. The overall and progression-free survival was 78% (95% CI 63-97). Allogeneic HSCT for patients with progressive follicular lymphoma is feasible and may result in prolonged disease-free survival.

Effect of gastrointestinal inflammation and age on the pharmacokinetics of oral microemulsion cyclosporin A in the first month after bone marrow transplantation.

Cyclosporin A (CsA) absorption is highly variable in BMT patients. Neoral, a new microemulsion formulation of CsA, permits increased absorption with less variable pharmacokinetic parameters in non-BMT patients. We evaluated the pharmacokinetics of CsA after BMT in patients received microemulsion CsA. Two oral doses of 3mg/kg were given 48 h apart between 14 and 28 days after allogeneic BMT in 20 adults, and one dose in seven children, while subjects were receiving a continuous i.v. infusion of CsA. Whole blood samples were taken throughout the dosing interval to calculate the incremental CsA exposure using maximum concentration (Cmax), time to Cmax (tmax), concentration at 12 h after the dose (C12), the area under the concentration-time curve (AUC), and to establish inter- and intra-patient pharmacokinetic variability. Drug exposure was substantially lower in children than adults, with an AUC of 861+/-805 vs 2629+/-1487 micromg x h/l (P = 0.001), respectively, and absorption was delayed and diminished in both groups by comparison with solid organ recipients. Intra-patient variability in adults for AUC was high at 0.59+/-0.34, while inter-patient variability, measured as the coefficient of variation (c.v.), was 0.55 for the first and 0.54 for the second dose. In adults, gastrointestinal (GI) inflammation due to either mucositis or GVHD resulted in a higher AUC of 3077+/-1551 microg x h/l compared to 1795+/-973 microg x h/l (P = 0.02), and a similar trend was observed in children. AUC seemed little affected by the CsA formulation (liquid or capsule), or co-administration with liquids or food. Trough (12 h) CsA levels correlated poorly with incremental AUC. Sparse sample modeling of the AUC using two-point predictors taken at 2.5 and 5 h after dosing accurately approximated AUC in adults (r2 = 0.94), while 1.5 and 5 h was superior in children (r2 = 0.98). These data suggest that 12 h postdose trough measurements of CsA may not be the most appropriate way to evaluate CsA blood concentrations in order to establish therapeutic efficacy in BMT patients. Based on this study, the dose of microemulsion CsA should be adjusted based on recipient age, and the presence of GI inflammation secondary to mucositis or GVHD. These data would suggest that sparse sampling at time points earlier than the trough more accurately reflects the AUC and may correlate more closely with therapeutic efficacy early post-BMT.

Treatment of myelodysplastic syndrome with busulfan-cyclophosphamide conditioning followed by allogeneic BMT.

Twenty-three consecutive patients undergoing related-donor BMT for myelodysplastic syndrome (MDS) were conditioned with a combination of busulfan (BU) and cyclophosphamide (CY). GVHD prophylaxis was with cyclosporine (CSP)/methotrexate (MTX) in 15 patients, CSP/methylprednisolone (MP) in six patients, and CSP/MP/MTX in two patients. The most frequent regimen-related toxicities were oral mucosal (87% of patients, 61% > or = grade II) and hepatic (82% of patients, 43% > or = grade II). The overall incidence of grade II-IV acute GVHD was 48% with eight patients dying of acute or chronic GVHD. There have been five relapses, with the cumulative risk of relapse being 35% (95% confidence interval [CI], 16%-66%). Eight patients remain alive and well (median follow-up 27 months, range 15-70 months), with an estimated 3-year event-free survival (EFS) of 35% (95% CI, 17%-54%). Univariate analysis of EFS by pretransplant variables indicated that only age < or = 35 years correlated with a favorable outcome (p = 0.04). BUCY is an effective, well-tolerated alternative conditioning regimen for MDS patients undergoing allogeneic BMT.

Influence of post-methotrexate folinic acid rescue on regimen-related toxicity and graft-versus-host disease after allogeneic bone marrow transplantation.

Thirty-two patients undergoing related-donor bone marrow transplantation (BMT) received cyclosporine (CSP) and methotrexate (MTX) with folinic acid rescue (FAR) as graft-versus-host disease (GVHD) prophylaxis. Fifty consecutive related-donor BMT patients given the CSP/MTX combination without FAR were utilized as historical controls. Patients receiving FAR experienced earlier engraftment, with absolute neutrophil count greater than 0.5 x 10(9)/l at a median of 17 days (vs 21 days in controls, p = 0.002). The day of last platelet transfusion was earlier in the FAR group (median of 14 days vs 17 days in controls, p = 0.01). Compared with the control group, patients receiving FAR had a lower incidence of grade II-IV stomatic (53% vs 78%, p = 0.04) and hepatic (25% vs 56%, p = 0.01) regimen-related toxicity. In the FAR group, 70% required total parenteral nutrition vs 92% of controls (p = 0.02). Broad-spectrum antibiotics were given to FAR patients for a median of 21 days (vs 23 days in controls, p = 0.09). The incidence of grade II-IV acute GVHD was similar in the FAR and control populations (45% and 35%, respectively, p = NS) as was the incidence of chronic GVHD (62% vs 55%, respectively, p = NS). Estimated event-free survival is 59% for FAR patients (median follow-up 64 weeks) and 58% for controls (median follow-up 109 weeks, p = NS). FAR reduces regimen-related toxicity in patients receiving CSP/MTX acute GVHD prophylaxis without significantly influencing GVHD incidence or event-free survival.

Characteristics and outcome of patients developing endocarditis following hematopoietic stem cell transplantation.

Endocarditis is an uncommon complication of hematopoietic stem cell transplantation (HSCT). A retrospective review of 1547 patients who underwent HSCT in Vancouver between January 1986 and December 2001 was performed. In all, 20 cases of endocarditis were identified (1.3% of all patients) with nine patients having received cryopreserved autologous stem cells, six stem cells from a histocompatible sibling and five patients stem cells from an unrelated donor. Five patients had endocarditis diagnosed while alive, a median of 6 months post-HSCT, by transthoracic (four patients) or transesophageal (one patient) echocardiography. The remaining 15 cases of endocarditis were only identified post mortem. The mitral valve was the most frequently involved (10 patients) followed by the aortic valve (six patients); multivalvular disease was noted in five patients. Of the 11 affected allogeneic HSCT patients, 10 had previously developed acute graft-versus-host disease (GVHD). Causative organisms were identified in 11 patients, while nine additional cases were felt to be thrombotic in origin. Of the 20 patients, 19 died with the sole survivor alive 10 years following an aortic valve replacement. Endocarditis is an uncommon complication of HSCT usually involving the cardiac valves on the left side of the heart and is associated with a high mortality rate.

Prophylaxis for acute graft-versus-host disease following unrelated donor bone marrow transplantation.

Despite the use of conventional chemoprophylaxis regimens, patients receiving unrelated-donor BMT are at high risk of developing severe acute GVHD. We evaluated a prophylactic regimen combining CsA, MTX and anti-CD5-ricin A chain immunotoxin (H65-RTA) in 31 patients; pentoxifylline was also given to reduce the anticipated nephrotoxicity of CsA. In most cases, planned doses of CsA, MTX and H65-RTA were given (i.e. to 77%, 77% and 93% of patients, respectively). Although fluid retention requiring diuretic therapy was frequent, only 1 patient had a > 10% unexplained increase in body weight during the first 21 days post-BMT. Also, while significant increase of the baseline serum creatinine was noted in 7 patients, none required dialysis. One patient suffered a reversible allergic reaction to the immunotoxin; no other side effects attributable to this regimen were observed. All but 2 patients engrafted (1 died of fungemia on d + 19 and the other had persistent leukemia) and no late graft failures were observed. Seventeen patients developed acute GVHD grade > or = II (probability, 58% [95% CI 41-76%]); 7 had grade > or = III (probability, 24% [95% CI 12-43%]). In the 27 patients who achieved stable engraftment and have survived beyond d + 100, the 3-year probability of developing chronic GVHD was 66% (95% CI 48-84%). As of the last follow-up prior to 01 May 1994, 13 patients are alive in CR and one in relapse; 9 of these patients are off all immunosuppressives and well. Four other patients relapsed and died, and 13 died of other transplant-related causes.(ABSTRACT TRUNCATED AT 250 WORDS)

Second malignancy following high-dose therapy and autologous stem cell transplantation: incidence and risk factor analysis.

To establish incidence and risk factors for development of second malignant neoplasms after high-dose chemo/radiotherapy (HDT) and autologous hematopoietic stem cell transplantation (AHSCT), the case files of 800 consecutive patients who underwent AHSCT at our institution between June 1982 and December 2000 were reviewed. In all, 26 patients developed 29 second malignancies (nine myelodysplastic syndrome (MDS)/acute myelogenous leukemia (AML), 16 solid tumors and four lymphoproliferative disorders (LPDs)) for a 15-year cumulative incidence of 11% (95% confidence interval (CI), 5-18%). These second tumors occurred at a median of 68 (range 1.5-177) months following AHSCT. The relative risk (RR) compared to the general population of developing a second malignancy following AHSCT was 3.3 (CI 2.2-4.7) P<0.001. The RR of developing MDS/AML, LPD and a solid tumor was 47.2 (CI 21.5-89.5) P<0.001, 8.1 (2.2-20.7) P=0.002 and 1.98 (1.1-3.2) P=0.009, respectively. In multivariate analysis, age >or=35 years at the time of AHSCT (P=0.001) and an interval from diagnosis to AHSCT >or=36 months (P=0.03) were associated with a greater risk of developing a second malignancy. Patients who have undergone HDT and AHSCT are at significant risk for developing a second malignancy and should receive indefinite follow-up.

Allogeneic bone marrow transplantation for low-grade lymphoma and chronic lymphocytic leukemia.

Twenty-six patients with low-grade lymphoma (LGL) (n = 18) or chronic lymphocytic leukemia (CLL) (n = 8) received allogeneic BMTs between 1985 and 1998. Median age was 42 years, median interval from diagnosis to transplant 22 months and median number of prior treatments three. Twenty (77%) had stage IV disease; 22 (85%) had never achieved CR. Donor source was HLA matched sibling (n = 19, 73%), matched unrelated (n = 6, 23%) or syngeneic (n = 1). Conditioning therapy included total body irradiation in 23 patients and busulphan in three. Twenty-five received GVHD prophylaxis with cyclosporine A; + methotrexate (n = 19), + methylprednisolone (n = 2) or + T cell depletion of allograft +/- methotrexate (n = 4). Sixteen patients are alive, a median of 2.4 years post BMT. Death occurred due to transplant complications (n = 7) or underlying disease (n = 3). Eighteen (12 LGL, six CLL) of 22 evaluable patients (82%) achieved CR post BMT. Cumulative incidence of refractory/recurrent disease was 18% (95% confidence interval (CI) 7-42%). Overall and event-free survivals were 58% (95% CI 35-75%) and 54% (95% CI 32-72%), respectively. Allogeneic BMT for young patients with advanced LGL or CLL is feasible and can result in long-term disease-free survival.

Lymphoproliferative disorders following allogeneic bone marrow transplantation: the Vancouver experience.

Between June 1988 and May 1996, 428 patients underwent allogeneic BMT (288 related donor (RD) and 140 unrelated donor (UD)) at the Vancouver General Hospital. Eight patients (UD six and RD two) developed a post-transplant lymphoproliferative disorder (PTLD). Median age at BMT was 38 years (range 22-51). Five of the six UD allografts were T cell depleted. Cyclosporine+/-methotrexate was used for GVHD prophylaxis. All eight patients developed GVHD; in six this was refractory to treatment with corticosteroids. Rabbit antithymocyte globulin (ATG) or an anti-CD5-ricin A chain immunotoxin (Xomazyme) was used as second-line therapy for GVHD. Presentation with PTLD occurred at median day 90.5 (range 34-282) post BMT. Five of the eight patients had a rapidly progressive course characterized by fever, lymphadenopathy, lung and liver involvement and died within 3-8 days. PTLD was an incidental finding at post mortem examination in two patients. The remaining patient had localized disease and recovered. Pathological analysis revealed two morphological patterns; diffuse large B cell lymphoma (DLBC lymphoma, five patients) and polymorphous B cell hyperplasia (PBCH, three patients). EBV expression was positive in all eight cases and monoclonality was demonstrated in seven cases. In multivariate analysis, T cell depletion of the allograft (P=0.0001, relative risk (RR)=30.5), anti-T cell therapy for GVHD (P=0.006, RR=12.7) and acute GVHD grades 3-4 (P=0.04, RR=7.7) were the significant factors for development of PTLD. In conclusion, we have identified two forms of PTLD after BMT: one is characterized by disseminated disease with a rapidly progressive and often fulminant course and the other by localized, relatively indolent disease. Morphology, EBV positivity and clonality do not appear to correlate with the clinical course. The major risk factors for development of PTLD after BMT are ex vivo T cell depletion of the allograft and in vivo anti-T cell therapy for GVHD.

Regimen-related toxicity and non-relapse mortality with high-dose cyclophosphamide, carmustine (BCNU) and etoposide (VP16-213) (CBV) and CBV plus cisplatin (CBVP) followed by autologous stem cell transplantation in patients with Hodgkin's disease.

This analysis compares the regimen-related toxicity (RRT) and overall non-relapse mortality (NRM) in Hodgkin's disease patients conditioned with either CBV (cyclophosphamide, BCNU (carmustine), and VP16-213 (etoposide)) (26 patients) or CBVP (CBV + cisplatin) (68 patients) followed by autologous stem cell transplantation (ASCT). CBVP included a continuous infusion rather than intermittent doses of etoposide, a lower BCNU dose and the addition of cisplatin. RRT and NRM were determined for each regimen and compared; risk factors for each were examined by multivariate analysis. Grade IV (fatal) RRT occurred in five patients (pulmonary in two, cardiac in two, and central nervous system in one). Eighteen patients experienced grade II-III pulmonary RRT, consistent with BCNU damage in 15. Prior nitrosourea exposure was the main risk factor for pulmonary RRT. Grade II mucosal and hepatic RRT occurred less often after CBVP vs CBV (P = 0.031 and 0.0003, respectively). In addition, three other early and eight late non-relapse deaths were seen. Median follow-up of the entire group is 5.1 (range 2.8-10.2) years. The probability of overall NRM was 26% (95% confidence interval (CI) 13-50%) with CBV vs 23% (95% CI 12-41%) with CBVP (P = 0.40). The progression-free survival and relapse rates were similar. Although the rates of fatal RRT, pulmonary RRT and overall NRM were similar with CBV or CBVP, CBVP produced less mucosal and liver RRT with a comparable antitumor effect. As many autografted patients are cured, future efforts should include measures to decrease NRM.

High incidence of extramedullary relapse of AML after busulfan/cyclophosphamide conditioning and allogeneic stem cell transplantation.

While allogeneic stem cell transplantation (SCT) is curative for a significant number of patients with AML, relapse of disease within the bone marrow and/or extramedullary (EM) sites following high-dose therapy continues to limit the success of this treatment. Between October 1985 and December 1996, 81 adults underwent allogeneic SCT for de novo AML at our centre. Forty-two patients remain alive and free of leukaemia with a median follow-up of 50 months. The 5-year actuarial event-free survivals (EFS) for all patients and for those undergoing SCT in CR1 or with advanced disease were 46% (95% confidence interval (CI) 34-58%), 63% (CI 46-76%), and 19% (CI 7-36%), respectively. Twenty-two patients relapsed at a median of 8 (range 1.6-54.5) months with the actuarial risk of relapse for all, CR1 and advanced disease patients being 38%, (CI 27-52%), 23% (CI 13-40%) and 68% (CI 46-88%), respectively. Ten patients relapsed at EM sites; six of these (27% of relapses) had an isolated EM relapse at a median of 31 (range 8.5-54) months. Three of the patients with isolated EM relapse survived > or =24 months following relapse and two patients remain disease-free at 29+ and 33+ months. BuCy conditioning followed by allogeneic SCT in AML results in satisfactory EFS although there is a significant risk of late isolated EM relapse.

Myelodysplastic syndrome and a nonrandom chromosomal abnormality t(1;19): an indolent pathologic entity.

The chromosomal abnormality t(1;19) is an infrequent finding in adult hematopoietic malignancies. This is only the second report of t(1;19) in association with myelodysplastic syndrome in which there was an apparent excellent response to oral cyclosporin A and a very indolent clinical course.

Acute myelogenous leukemia complicated by acute necrotizing ulcerative gingivitis due to Aspergillus terreus.

Infections caused by Aspergillus terreus are rare but have been associated with a poor outcome in immunocompromised patients due to frequent resistance to conventional antifungal therapy. This report describes a case of a woman who developed acute necrotizing ulcerative gingivitis (ANUG) due to A. terreus during induction chemotherapy for acute myelogenous leukemia. She initially failed to respond to treatment with amphotericin B but the infection resolved following the introduction of oral itraconazole. Opportunistic infections caused by A. terreus are an emerging problem and can be associated with a high mortality rate. Early microbiological diagnosis is critical since resistance to amphotericin B is likely and itraconazole appears to be an effective treatment for this infection.

Bone marrow necrosis in adult acute leukemia and non-Hodgkin's lymphoma.

Bone marrow necrosis is a rare finding in adult patients diagnosed with acute leukemia or non-Hodgkin's lymphoma. Previous reports have suggested that it is associated with a poor prognosis. It remains unclear however, whether improvements in patient care during the last decade have altered patient outcome. In a retrospective review of 581 bone marrow biopsies performed ante mortum on adult patients with acute leukemia or non-Hodgkin's lymphoma, we identified 10 cases of bone marrow necrosis (5 acute myeloid leukemia, 5 non-Hodgkin's lymphoma). Severe bone pain, elevated serum lactate dehydrogenase levels and leukoerythroblastic peripheral blood smears were common presenting features. Despite treating 8 of the 10 patients with curative intent, only 2 patients remain alive and disease-free. This study confirms that bone marrow necrosis in adults with acute leukemia and non-Hodgkin's lymphoma is a rare ante mortum finding and confers a poor prognosis. Whether these patients would benefit from more intensive therapy such as hematopoietic stem cell transplantation remains to be clarified.

Development of a biologically distinct EBV-related lymphoproliferative disorder following autologous bone marrow transplantation for an EBV-negative post-renal allograft Burkitt's lymphoma.

Post-transplant lymphoproliferative disorder (PTLD) is a known complication of both solid organ transplantation and allogeneic bone marrow transplantation (BMT) but is rarely seen following autologous BMT. We report the case of a 45 year-old female who developed Burkitt's lymphoma eight years after a renal allograft. This PTLD was found to have lambda light chain restriction, contained del(8)(q24) and add(14)(q32), and was negative for EBV on immunohistochemical and DNA-based PCR analyses. Immunoglobulin heavy chain (IgH) PCR studies revealed a prominent clonal rearrangement. She responded to intravenous cyclophosphamide and proceeded to high-dose chemoradiotherapy and mafosfamide-purged autologous BMT. Thirty-nine days post-BMT she presented with cough and fever and developed hepatic dysfunction; abnormal lymphoplasmacytoid cells were noted in the peripheral blood. Investigations revealed kappa light chain restriction, an oligoclonal IgH rearrangement, a normal karyotype and PCR studies for EBV were positive, consistent with a clinically and biologically distinct PTLD. She initially improved following discontinuation of immunosuppression, but then deteriorated abruptly and died 58 days post-BMT. It is likely that the two separate episodes of PTLD in this patient, one of which was atypical, arose as a result of both the chronic use of cyclosporine and the impairment of cell-mediated immunity associated with autologous BMT. The sequence of events in this patient should contribute to a better understanding of late-onset, EBV-negative PTLD.