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Biomedical subjects

L Dabich

Publications and source records attributed to L Dabich.

At least 19 recordsLinked to original sources
PubMed1995

A prospective evaluation of the roles of allogeneic marrow transplantation and low-dose monthly maintenance chemotherapy in the treatment of adult acute myelogenous leukemia (AML): a Southwest Oncology Group study.

Between February 1982 and December 1986, the Southwest Oncology Group conducted a prospective study in patients with newly diagnosed acute myeloid leukemia (AML) with two objectives: to evaluate the role of allogeneic marrow transplantation for patients in first remission, and to evaluate the role of low-dose monthly maintenance therapy in those patients not transplanted in first remission. Among 522 evaluable patients, 295 (57%) achieved complete remission (CR), including 70% of patients age 49 or less. Twenty-four patients (15%) age 49 or less in CR were not HLA-typed, mostly because of financial constraints. HLA-identical donors were found for 39% of patients, of whom two-thirds were transplanted in first CR. The 5-year disease-free survival among those transplanted in first CR, those with donors not transplanted in first CR, and those less than age 50 without donors was 41, 42, and 29%, respectively (P = 0.60). A total of 150 eligible patients were randomized to receive late intensification alone or late intensification plus monthly maintenance. In multivariate analyses, treatment with maintenance was associated with prolonged disease-free survival (P = 0.028), but not improved overall survival (P = 0.27). Factors associated with improved overall survival included younger age, lower white blood count (WBC) at diagnosis, having leukemia of M3 morphology, and being of white race. In this study, a diagnosis of M3 AML was particularly favorable, with disease-free and overall survivals of 75 and 56%, respectively, at 7 years.

Adult↗
PubMed1994

Therapy-related acute myeloid leukaemia following immunosuppression with azathioprine for polymyositis.

A 52-year-old man developed therapy-related acute myeloid leukemia (AML) following prolonged immunosuppression with azathioprine for polymyositis. Karyotypic analysis showed deletions of the short arm of chromosome 7 and the long arm of chromosome 5. The importance of recognizing this potential complication while treating benign rheumatological and immunological diseases with purine analogues like azathioprine is emphasized. Therapy-related AML is a poor prognostic group that does not respond favourably to standard induction therapy.

Acute Disease↗
PubMed1994

Hb Washtenaw [ beta 11(A8)Val-->Phe]: an electrophorectically silent, unstable, low oxygen affinity variant associated with anemia and chronic cyanosis.

Hb Washtenaw [beta 11(A8)Val-->Phe] is a new, low oxygen affinity variant with a previously undescribed substitution, identified in seven members over three generations of a Hungarian-American family. The hemoglobin is mildly unstable and the family members studied are clinically asymptomatic but mildly cyanotic, and some exhibit mild anemia. The index case had severe pulmonary hypertension and some of the family members had increased pulmonary vascular resistance on echocardiography. An association between the inheritance of this abnormal hemoglobin and the pathogenesis of primary pulmonary hypertension is suggested but the mechanism is unclear.

Adolescent↗
PubMed1993

Effect of cold stress on coronary sinus blood flow in patients with scleroderma.

The mechanism of cardiac involvement in scleroderma is not known. Histologic studies of the myocardium in patients who died of scleroderma revealed that half had myocardial damage. Characteristic involvement ranges from focal contraction-band necrosis to diffuse fibrosis despite the absence of obstructive coronary artery disease of the major epicardial vessels. These findings suggest that scleroderma heart disease might result from episodic reduction of coronary blood flow due to abnormalities of coronary vasomotor tone. Studies using cold pressor thallium 201 myocardial perfusion scans support this hypothesis. Our study measured coronary blood flow during hand immersion in ice water at cardiac catheterization to determine whether patients with scleroderma had an abnormal coronary blood flow response. Coronary sinus blood flow was measured using a thermodilution method. Five patients with scleroderma were compared with 5 control subjects. All patients and controls had normal coronary angiograms. The coronary blood flow at baseline in the scleroderma and the control group (130 +/- 33 mL/min and 86 +/- 27 mL/min, respectively) was not significantly different. During the cold pressor test, both groups had a small, insignificant increase in coronary blood flow from baseline to 60 seconds (130 to 144 mL/min, scleroderma patients; 86 to 89 mL/min, control subjects). Our findings suggest that the cold pressor test does not cause an abnormal increase in coronary vasomotor tone or an absolute reduction in coronary blood flow in patients with scleroderma, as previously suggested by thallium 201 cold pressor studies.

Adult↗
PubMed1992

Late intensification with POMP chemotherapy prolongs survival in acute myelogenous leukemia--results of a Southwest Oncology Group study of rubidazone versus adriamycin for remission induction, prophylactic intrathecal therapy, late intensification, and levamisole maintenance.

Between August 1978 and September 1982, 642 patients with newly diagnosed acute myelogenous leukemia (AML) were entered onto a Southwest Oncology Group Study which addressed four questions. (i) What is the comparative utility of rubidazone versus adriamycin in remission induction? (ii) What is the role of prophylactic intrathecal therapy in AML? (iii) Does late intensification affect treatment outcome? (iv) Does maintenance with levamisole affect disease-free survival or overall survival? Among 611 evaluable patients, 329 (54%) achieved complete remission. There was no difference in the remission rate between those patients receiving rubidazone (54%) and those receiving adriamycin (54%) as part of the induction regimen. Prophylactic intrathecal therapy with cytosine arabinoside had no effect on the incidence of central nervous system disease or survival. After nine months of complete remission, patients were randomized between late intensification with POMP (mercaptopurine + vincristine + methotrexate + prednisone) or continued maintenance with OAP (vincristine + cytosine arabinoside + prednisone). T patients randomized to late intensification had better survival and disease-free survival, compared to those randomized to receive no late intensification (p = 0.027 and 0.030, respectively). At twelve months of remission, surviving patients were randomized to receive levamisole or no further treatment. There was no evidence that levamisole affected survival or disease-free survival.

Antineoplastic Combined Chemotherapy Protocols↗
PubMed1991

Alternated versus syncopated CHOP-PVB: two studies for the treatment of non-Hodgkin's lymphoma by the Southwest Oncology Group.

Based on a preliminary trial that suggested that CHOP (cyclophosphamide, doxorubicin, vincristine, prednisone), and PVB (cisplatinum, vinblastine, bleomycin), are at least partially non-cross-resistant, the Southwest Oncology Group treated patients with unfavorable histology, non-Hodgkin's lymphoma with CHOP and PVB. In the first study, 76 eligible patients were given three courses of CHOP, with complete or partial responders receiving three courses of PVB followed by three further courses of CHOP. Nonresponders after the initial three cycles of CHOP, received six courses of PVB. In the second study, 154 eligible patients were treated with alternating cycles of the two drug regimens. The overall objective antitumor response (CR + PR) was 77% for the first study and 58% for the second. The complete remission rates were 48% and 38%, respectively. The overall survival for both studies is similar. These results are interpreted in terms of the Goldie-Coldman hypothesis.

Antineoplastic Agents↗
PubMed1990

Aclacinomycin A in the treatment of multiple myeloma: a Southwest Oncology Group study.

Fifty-two patients with progressive resistant multiple myeloma were entered in this Southwest Oncology Group Phase II study, using weekly intravenous Aclacinomycin A. Of forty-three evaluable patients for response, there was one partial remission of 2 years duration and two sustained clinical improvements with 25% reduction in paraprotein. Major toxicity seen was severe myelosuppression and significant nausea and vomiting requiring dose reduction and delay of the scheduled treatment. Cardiac arrhythmia was seen in one patient. Chronic daily schedule or continuous IV infusion is recommended for future study.

Aclarubicin↗
PubMed1989

Retrospective studies in scleroderma: pulmonary findings and effect of potassium p-aminobenzoate on vital capacity.

The principal clinical pulmonary findings were extracted from University of Michigan Hospital records of 390 patients with scleroderma. Dyspnea was the most frequent symptom and strongly correlated with pulmonary fibrosis and with decreased vital capacity (FVC) and CO diffusing capacity (DLCO). The mean value for FVC was 84% of the predicted normal for 326 patients, and that of the initial DLCO 56.8% of the predicted normal (323 patients). Pulmonary fibrosis was diagnosed on first chest X-ray in 80 of 382 patients. An additional 48 patients developed fibrosis detected on subsequent X-rays. Analyses were performed to determine whether the deterioration of pulmonary function over time was less for scleroderma patients who were adequately treated with potassium p-aminobenzoate (KPAB) than for those inadequately or never treated with KPAB, The average decrease for both FVC and DLCO was found to be less for KPAB-treated patients. However, only in the case of vital capacity was the difference significant. In the presence of radiological evidence of pulmonary fibrosis FVC decreased more rapidly (p = 0.002), but the decline in DLCO was not affected. When adjusting for the presence or absence of fibrosis the average slopes of the logarithm of vital capacity were significantly less negative (p = 0.003) for patients on KPAB.

4-Aminobenzoic Acid↗
PubMed1989

Treatment of acute lymphoblastic leukemia in adults with intensive induction, consolidation, and maintenance chemotherapy.

The Southwest Oncology Group conducted a study of acute lymphoblastic leukemia (ALL) in adults over a 5-year period, testing the utility of the L-10M regimen initially described by the group from Memorial Sloan-Kettering Cancer Center. One hundred sixty-eight eligible patients were treated with this intensive combination chemotherapy regimen. One hundred fifteen (68%) achieved complete remission. With the current median follow-up time of 34.5 months, the median durations of remission, relapse-free survival, and overall survival were 22.9, 20.9, and 17.7 months, respectively. Only 35% of the patients over 50 years of age achieved a complete remission. Age was a significant prognostic factor for complete response, survival, relapse-free survival, and remission duration. In addition, a low initial WBC count was found to have a statistically significant association with longer remission duration. Responders between the ages of 20 and 49 years with WBC counts of less than 15,000 appear to have an exceptionally good prognosis.

Adolescent↗
PubMed1988

Cisplatin, VP-16-213 and MGBG (methylglyoxal bis guanylhydrazone) combination chemotherapy in refractory lymphoma, a phase II study.

In an effort to improve the treatment of patients with refractory or recurrent lymphoma, we developed a protocol using cis-platinum combined with two other agents of known efficacy in these disorders but with differing side effects: VP-16 and MGBG. Twenty-six eligible patients were treated with this regimen. There were 15 men and 11 women with a median age of 54 years (22-73), and performance status of 1 (0-3). Their diagnoses were Hodgkin's disease 5 and non-Hodgkin's lymphoma [NHL] 21 which included 11 with diffuse histocytic lymphoma [DHL]. The median number of chemotherapy regimens was 2 (1-5); 12 also received radiotherapy. Twenty patients are evaluable for response: 15 NHL and 5 Hodgkin's disease. Three patients, all of whom had DHL entered complete remission (20%) with a median time to treatment failure of 7 1/2 months. Six NHL (40%) and one Hodgkin's disease (20%) patients entered a partial remission. There were three early deaths: one due to progressive disease, one to acute respiratory failure, and one with disease status undocumented. Toxicity included leukopenia, thrombocytopenia, anorexia, nausea, vomiting, stomatitis, alopecia, renal failure, profound peripheral neuropathy, and hypersensitivity vasculitis. Treatment was stopped because of the latter two. These agents are non-crossresistant with doxorubicin-containing regimens. The drugs are possibly synergistic and modestly active with moderate to severe toxicity.

Adult↗
PubMed1988

Retrospective studies in scleroderma: effect of potassium para-aminobenzoate on survival.

Demographic and survival data are presented for 390 patients with scleroderma. For the entire group an estimated 81.4% survived 5 years from diagnosis and 69.4% survived 10 years. Life-table analyses revealed that adequate treatment with potassium para-aminobenzoate (Potaba KPAB) was associated with improved survival (p less than 0.01); 88.5% 5 year survival rate and 76.6% 10 year survival rate for adequately treated patients. Five and ten year survival rates for patients never treated with KPAB were 69.8 and 56.6%, respectively. Similar findings were obtained by comparing observed to expected mortality for these patients; again, KPAB therapy showed prolongation of survival. The Cox proportional hazards model was also applied to this retrospective study adjusting for baseline clinical involvement, demographics and KPAB treatment. There were some interesting results including a high significance for skin involvement per se as a prognostic indicator: the greater the extent of skin involvement the poorer prognosis. Time from first diagnosis to first University Hospital visit or admission when included as a covariate did not influence survival.

4-Aminobenzoic Acid↗
PubMed1986

Potassium para-aminobenzoate and liver function test findings.

Risk of hepatotoxicity has been raised with respect to potassium para-aminobenzoate (Potaba) therapy. In this regard relevant clinical and laboratory hepatic findings in the hospital records of 390 scleroderma patients were analyzed. There were 274 patients who had received potassium para-aminobenzoate at some time and 116 who never received it. No instance was found in which potassium para-aminobenzoate was the cause of an acute hepatic hypersensitivity reaction. There were random or intercurrent abnormalities in hepatic test findings over time, but these actually occurred more often in the group of patients never treated with potassium para-aminobenzoate. Further, there was no evidence that long-term potassium para-aminobenzoate therapy is hepatotoxic. These findings suggest that acute hepatic reaction to potassium para-aminobenzoate is at least uncommon if not rare.

4-Aminobenzoic Acid↗
PubMed1986

Improved survival duration with combination chemotherapy induction for multiple myeloma: a Southwest Oncology Group Study.

Four hundred forty previously untreated patients with active multiple myeloma were entered into a randomized trial (Southwest Oncology Group [SWOG] study 7927/28) comparing vincristine, melphalan, Cytoxan (Mead Johnson & Company, Evansville, Ind), and prednisone (VMCP) alternating with vincristine, BCNU, Adriamycin (Adria Laboratories, Columbus, Ohio) and prednisone (VBAP) with or without levamisole with vincristine, Cytoxan, and prednisone (VCP) with or without levamisole for induction therapy. The treatment groups were well balanced for all of the known major prognostic factors. Patients receiving VMCP-VBAP responded (greater than or equal to 75% regression) more frequently to induction therapy, both without (54%) and with (44%) levamisole v VCP without (28%) or with (28%) levamisole (P less than .001). In addition, patients receiving VMCP-VBAP (+/- levamisole) had a survival duration determined to be significantly increased by all forms of analysis: 48 and 33 months for VMCP-VBAP without and with levamisole v 29 and 26 months for VCP without and with levamisole (P = .011 overall). Levamisole did not improve response rates or survival duration (P greater than or equal to .1), nor did it prolong remission in the maintenance phase (P = .85). Analysis of SWOG study 7704/05 (updated April 1985) confirmed improved survival for combination therapy v MP, but no benefit for levamisole. The overall findings support the use of VMCP-VBAP as an excellent treatment option for remission induction in patients with active myeloma of all stages and prognostic categories.

Actuarial Analysis↗
PubMed1986

Phase II evaluation of aclarubicin in refractory adult acute leukemia: a Southwest Oncology Group Study.

Aclarubicin, a new anthracycline antibiotic, was used to treat 24 adult patients with refractory adult leukemia, using a total dose of 300 mg/m2 (75 mg/m2/day X 4). There were 20 patients with acute myelogenous and four with acute lymphoblastic leukemia. Approximately two-thirds of the patients had a Karnofsky score of less than or equal to 2, and two-thirds had received two or more previous induction programs. Interim bone marrow evaluation was obtained in 18 of 30 remission induction courses and revealed marked hypocellularity in 14, inadequate specimens in three, and persistent disease in one. Seven patients received more than one course. Two patients refused further therapy. In patients with myelogenous leukemia, there were two complete remissions lasting 10 and 16 months and one partial remission lasting 4 1/2 months. There were no responders in patients with lymphoblastic leukemia. Toxicity included profound leukopenia and thrombocytopenia, moderate nausea and vomiting, diarrhea, and mucositis. There were no cardiac symptoms associated with the drug infusion, but there were three late events possibly associated with anthracycline cardiotoxicity. Used in this dosage schedule, aclarubicin is an active, but toxic, agent in the acute myelogenous leukemias.

Aclarubicin↗
PubMed1985

Barrett's esophagus complicating scleroderma.

Two patients with scleroderma whose esophageal involvement was associated with long-standing reflux esophagitis were found to also have Barrett's esophagus. Since Barrett's esophagus is a premalignant condition, these patients with scleroderma should be considered at high risk for the development of adenocarcinoma of the esophagus.

Adult↗
PubMed1985

Chemotherapy with cyclophosphamide, doxorubicin, vincristine, and prednisone alone or with levamisole or with levamisole plus BCG for malignant lymphoma: a Southwest Oncology Group Study.

Between 1977 and 1983 the Southwest Oncology Group (SWOG) evaluated chemotherapy alone (cyclophosphamide, doxorubicin, vincristine, prednisone; CHOP) or chemoimmunotherapy (CHOP-levamisole or CHOP-levamisole-BCG) in a randomized prospective clinical trial involving 715 eligible patients with all types of malignant lymphoma (ML). Of 281 evaluable patients with favorable histologic types of ML, 171 (61%) achieved complete remission (CR) and there was no difference in CR rate, CR duration, or survival according to the type of initial treatment. Of 388 evaluable patients with unfavorable histologic types of ML, 194 (50%) achieved CR. Levamisole appeared to adversely affect CR rates in nodular mixed and nodular large-cell lymphoma and CR duration in patients with unfavorable histology ML. Chemoimmunotherapy with levamisole or levamisole-BCG offers no advantage in terms of CR rates, CR duration, or survival compared to CHOP chemotherapy alone, and levamisole may have had an adverse impact on outcome in certain subtypes of ML.

Antineoplastic Combined Chemotherapy Protocols↗