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Original Article

Autologous Bone Marrow Transplantation versus Intensive Consolidation Chemotherapy for Acute Myeloid Leukemia in Childhood

Yaddanapudi Ravindranath, M.B., B.S., Andrew M. Yeager, M.D., Myron N. Chang, Ph.D., C. Philip Steuber, M.D., Jeffrey Krischer, Ph.D., John Graham-Pole, M.D., Andrew Carroll, Ph.D., Susumu Inoue, M.D., Bruce Camitta, M.D., and Howard J. Weinstein, M.D. for the Pediatric Oncology Group

N Engl J Med 1996; 334:1428-1434May 30, 1996

Abstract

Background

The value of autologous bone marrow transplantation in the treatment of children with acute myeloid leukemia (AML) is unknown. We compared autologous bone marrow transplantation with intensive consolidation chemotherapy as treatments for children with AML in first remission.

Methods

We induced remission with one course of daunorubicin, cytarabine, and thioguanine, followed by one course of high-dose cytarabine (3 g per square meter of body-surface area for six doses). Patients in remission after the second course of induction therapy were eligible for randomization. Between June 1988 and March 1993, 552 of 649 enrolled patients who could be evaluated (85 percent) entered remission. A total of 209 patients were not eligible for randomization; of the remaining 343 patients, 232 were randomly assigned to receive six courses of intensive chemotherapy (117 patients) or autologous transplantation (115 patients). Of the original 649 patients, 189, including 21 with Down's syndrome, were nonrandomly assigned to receive intensive chemotherapy.

Results

The mean (±SE) rates of event-free survival and overall survival for the entire group at three years were 34±2.5 percent and 42±2.6 percent, respectively. For patients who were randomly assigned to one of the two treatment groups, the rates of event-free survival three years after randomization were not significantly different in the two groups when examined by intention-to-treat analysis: 36±5.8 percent for the intensive-chemotherapy group as compared with 38±6.4 percent for the autologous-transplantation group; and the relative risk of treatment failure for the chemotherapy group as compared with the autologous-transplantation group was 0.81 (P = 0.20 by the log-rank test; 95 percent confidence interval, 0.58 to 1.12). Overall survival at three years followed a similar pattern. There was a lower relapse rate (31 percent vs. 58 percent, P<0.001) but a higher rate of treatment-related mortality (15 percent vs. 2.7 percent, P = 0.005) in the group treated with autologous transplantation than in the intensive-chemotherapy group. The event-free survival at three years for the nonrandomized intensive-chemotherapy group was 39±5.1 percent, and for a contemporaneous group of patients each of whom received a histocompatible bone marrow transplant from a sibling, it was 52±8.0 percent.

Conclusions

Treatment of children with AML in first remission with either autologous bone marrow transplantation or intensive chemotherapy prolongs event-free survival equally.

Media in This Article

Figure 1Treatment Plan and Patient Assignments in the Study.
Figure 2Event-free Survival from the Time of Randomization or Assignment to Allogeneic Bone Marrow Transplantation.
Article

Chemotherapy can induce a remission in up to 85 percent of children with acute myeloid leukemia (AML).1-7 However, most patients relapse, and the long-term event-free survival ranges from 29 to 45 percent.1-7

The high rates of relapse in these children prompted the use of intensified chemotherapy and bone marrow transplantation after the initial remission. Among children with AML who receive allogeneic bone marrow transplants from histocompatible siblings, approximately 55 percent can be cured.8,9 However, less than 20 percent of children in the United States have suitable family donors for allogeneic transplantation.10 Another strategy, autologous bone marrow transplantation,11,12 has been evaluated in nonrandomized trials conducted in patients with AML in first remission. The results have been encouraging but ambiguous, because of biases in patient selection.13-15 We therefore undertook a multicenter, randomized trial to assess autologous transplantation in children with AML in first remission. Our results do not show a significant advantage of autologous bone marrow transplantation over intensive consolidation chemotherapy.

Methods

Eligibility

Patients under 21 years of age with previously untreated AML or isolated granulocytic sarcoma (chloroma) were eligible for the study. Patients with secondary AML were permitted to register for evaluation of the initial response but not for randomization at the time of remission. Morphologic classification followed the French–American–British system and was centrally reviewed.

Randomization

After giving informed consent, all patients were registered in the study prospectively. Patients who did not enter remission after the second course of induction chemotherapy were withdrawn from the study. Patients with histocompatible sibling donors were offered allogeneic bone marrow transplantation. The remaining patients were eligible for random assignment to either autologous transplantation or intensive consolidation chemotherapy, provided that they reaffirmed their intention to accept the randomized treatment, that financial support for autologous transplantation was available, and that there was a bed available at 1 of the 16 transplantation centers of the Pediatric Oncology Group. The randomization procedure was aimed at balancing the marginal totals of each morphologic subtype of AML.

Treatment

Induction therapy was given in two courses. The first course consisted of 45 mg of daunorubicin per square meter of body-surface area per day on days 1, 2, and 3; 100 mg of cytarabine per square meter per day by continuous infusion on days 1 through 7; and 100 mg of thioguanine per square meter per day, orally, on days 1 through 7; this was followed by high-dose cytarabine (3 g per square meter as a 3-hour infusion, every 12 hours for six doses).7 The second course of this treatment started on day 15 if the bone marrow showed residual leukemia; otherwise, it was begun when the absolute neutrophil count was 1000 per cubic millimeter or higher and the platelet count was 100,000 per cubic millimeter or higher. Intrathecal cytarabine (40 mg per square meter) was given on days 1 and 8 of the first course of induction therapy. Additional intrathecal cytarabine was given on days 12 and 19 to patients who had central nervous system leukemia at the time of diagnosis. Patients who entered remission (defined as having M1 marrow [<5 percent blasts] or M2a marrow [5 to 15 percent blasts]) were eligible for randomization. After randomization, all the patients received one course of etoposide (250 mg per square meter per day) on days 1, 2, and 3; azacytidine (300 mg per square meter per day) on days 4 and 5; and intrathecal cytarabine (40 mg per square meter) on days 1 and 7. The combination of etoposide and azacytidine was chosen as a consolidation therapy because of its low hematopoietic toxicity16 and hence the lower risk of serious infections in patients waiting for marrow transplantation. At this point the patients received either intensive chemotherapy, autologous transplantation, or allogeneic transplantation, depending on their treatment group.

Intensive Consolidation Chemotherapy

Patients assigned to receive intensive chemotherapy received six additional courses of therapy, each administered successively at three-week intervals or when the absolute neutrophil count was at least 1000 per cubic millimeter and the platelet count was at least 100,000 per cubic millimeter. The first drug course consisted of 45 mg of daunorubicin per square meter on day 1 and cytarabine as in the second induction course; the second course consisted of daunorubicin for two days and cytarabine and thioguanine for five days, with drug doses as in the first induction course; the third course consisted of etoposide and azacytidine, with drug doses as described above; the fourth course consisted of high-dose cytarabine, as in the second induction course; the fifth course was the same as the second course; and the sixth course was the same as the third. The cumulative dose of daunorubicin was 350 mg per square meter. Local radiotherapy was permitted for patients with central nervous system or extracranial mass lesions.

Autologous Bone Marrow Transplantation

Patients who were to undergo autologous transplantation had to be in complete remission after the consolidation course of etoposide and azacytidine and free of disseminated fungal disease. The protocol required harvesting the patient's bone marrow 6 to 12 weeks after the start of etoposide and azacytidine. To eliminate myeloblasts, the harvested marrow was treated under sterile conditions for 30 minutes with perfosfamide (4-hydroperoxycyclophosphamide) at a concentration of 100 μg per milliliter and an incubation hematocrit of 5 to 10 percent.

Patients were prepared for autologous marrow transplantation with 4 mg of busulfan per square meter per day, administered orally every six hours, on days 9, 8, 7, and 6 before transplantation and 50 mg of cyclophosphamide per kilogram, given intravenously, on days 5, 4, 3, and 2 before transplantation. After a day of rest, the cryopreserved marrow was thawed and infused (day 0). All patients received phenytoin (on days 11 through 4 before transplantation) as prophylaxis against seizures.

Allogeneic Bone Marrow Transplantation

Allogeneic transplantation was not a primary focus of this study because many Pediatric Oncology Group centers offer this treatment to any patient with a histocompatible family donor. The preparative regimen consisting of busulfan and cyclosphosphamide was strongly recommended, but a variety of conditioning regimens were used.

Statistical Analysis

It was necessary to have at least 150 randomized patients in order to achieve a power of 80 percent at the 0.05 significance level to detect a difference of 20 percentage points (40 percent vs. 60 percent) in event-free survival two years after randomization between patients who underwent autologous transplantation and those who received intensive consolidation chemotherapy.

Event-free survival was defined as the length of time until the first event — that is, treatment failure (relapse or failure to enter remission) or death. Overall survival was defined as the length of time until death. Calculations of event-free and overall survival for the entire group started from the date of registration; for the randomized groups they started from the date of randomization. Actuarial curves showing event-free and overall survival were constructed according to the Kaplan–Meier method.17 The relative risks were estimated with the Cox proportional-hazards model.18 Findings with respect to event-free and overall survival were tested for statistical significance by the log-rank test,19 according to the intention-to-treat principle. All P values reported in this article are two-sided.

Results

Between June 1988 and March 1993, 666 patients, 1 day to 20.9 years of age, were registered. Seventeen could not be evaluated, because of wrong diagnoses (10), major protocol violations (3), or withdrawal before induction therapy was completed because of toxicity or a parent's refusal of further therapy (4). Of the 649 patients who could be evaluated, 552 (85 percent) entered remission (507 had M1 marrow and 45 had M2a marrow). Death accounted for 26 of the 97 induction failures (27 percent); the other 71 patients who failed to enter remission had resistant disease. Figure 1Figure 1Treatment Plan and Patient Assignments in the Study. shows the numbers of patients at each stage of treatment; 209 were not eligible for randomization because a suitable donor was available for allogeneic transplantation (89) or because of nonprotocol autologous transplantation (18), secondary AML (5), insufficient funds (64), lack of beds at a Pediatric Oncology Group transplantation institution (14), death before randomization (6), withdrawal due to drug toxicity (5), relapse before randomization (5), or other reasons (3). Thus, 343 of the 552 patients (62 percent) who entered remission were eligible for randomization. Of these, 232 (68 percent) were randomly assigned to a treatment group — 117 to the intensive-chemotherapy group and 115 to the autologous-transplantation group. The remaining 111 patients (32 percent), including 21 children with Down's syndrome, or their parents declined randomization.

Clinical and Disease Characteristics

The two randomized groups had similar distributions of clinical, morphologic, and cytogenetic features (Table 1Table 1Characteristics of the Patients in Remission after Induction Therapy.), except for a slight excess of extramedullary disease in the autologous-transplantation group. A stratified log-rank test adjusting for extramedullary disease failed to show a significant difference in event-free survival between the randomized groups (P = 0.21).

Patterns of Treatment Failure in Randomized Patients

Table 2Table 2Patterns of Treatment Failure. summarizes the reasons some patients did not complete the randomized treatment and shows the patterns of failure. More than a third of the patients (44 of 115, or 38 percent) assigned to autologous transplantation did not receive the intended treatment. Twenty-one patients relapsed before their marrow could be harvested. The parents of 14 patients chose intensive chemotherapy after randomization, 3 patients had disseminated fungal sepsis, the families of 5 opted for allogeneic transplantation, and 1 was lost to follow-up. The outcomes of these patients were included with those of the autologous-transplantation group in the intention-to-treat analysis. In contrast, only four patients (3.4 percent) assigned to intensive chemotherapy changed treatment options. The number of treatment-related deaths was significantly higher after autologous transplantation (11 of 71, or 15 percent) than after chemotherapy (3 of 113, or 2.7 percent; P = 0.005).

Event-Free and Overall Survival

For all eligible patients, the mean (±SE) rates of event-free and overall survival at three years were 34±2.5 percent and 42±2.6 percent, respectively. The estimated event-free survival three years after randomization, according to the intention-to-treat analysis, was 36±5.8 percent in the intensive-chemotherapy group and 38±6.4 percent in the autologous-transplantation group (P = 0.20) (Figure 2Figure 2Event-free Survival from the Time of Randomization or Assignment to Allogeneic Bone Marrow Transplantation.). The relative risk of treatment failure was 0.81 (95 percent confidence interval, 0.58 to 1.12) for the chemotherapy group as compared with the autologous-transplantation group. The rates of event-free and overall survival at three years for the nonrandomized chemotherapy group were 39±5.1 percent and 49±5.2 percent, respectively.

The estimated rates of overall survival three years after randomization (Figure 3Figure 3Overall Survival from the Time of Randomization or Assignment to Allogeneic Bone Marrow Transplantation.) for the chemotherapy and autologous-transplantation groups were 44±6.0 percent and 40±6.1 percent, respectively (P = 0.10 by the log-rank test), with a relative risk of death of 0.75 (95 percent confidence interval, 0.53 to 1.06) for the chemotherapy group as compared with the autologous-transplantation group.

Children with Down's Syndrome

As the study evolved, the superior survival of children with Down's syndrome became evident,20 and thereafter the vast majority of these patients were assigned to receive chemotherapy, according to their physicians' preference. Thus, of 27 children with Down's syndrome who entered remission, 26 received intensive chemotherapy and 1 underwent allogeneic transplantation. Patients with Down's syndrome as a group had a three-year event-free survival of 77±2.1 percent. Removal of these patients (and three with isolated cases of granulocytic sarcoma) from the randomized groups did not alter the results (three-year event-free survival was 37 percent and 34 percent, respectively, for the autologous-transplantation and intensive-chemotherapy groups; P = 0.28).

Allogeneic Transplantation

Sixteen percent of the patients entering remission (89 of 552) had histocompatible donors and their families opted for allogeneic transplantation. The event-free survival three years after randomization was marginally better for the children who underwent allogeneic transplantation (52±8 percent) than for those given intensive consolidation chemotherapy (P = 0.06) and significantly better than that for children who underwent autologous transplantation (P = 0.01 by the log-rank test) (Figure 2). Overall survival after allogeneic transplantation was similar to that after intensive consolidation chemotherapy (P = 0.15) but superior to that after autologous transplantation (P = 0.007) (Figure 3).

Autologous Transplantation

The protocol called for bone marrow to be harvested 42 days after the consolidation course of etoposide and azacitidine (with a maximal allowable delay of 84 days). In actuality, the median time from randomization to the harvesting of marrow was 49 days (range, 21 to 106). In three patients, the marrow was harvested more than 84 days after treatment with etoposide and azacytidine. Delays were due for the most part to an unexpected biphasic pattern of recovery of blood counts after consolidation therapy. As a result, the interval between the consolidation therapy and the harvesting of bone marrow exceeded the minimal target of 42 days in 76 percent of the patients (it was more than 84 days in 20 percent of the patients).

The length of time until engraftment (defined as an absolute neutrophil count of more than 500 per cubic millimeter and a platelet count of more than 50,000 per cubic millimeter) ranged from 11 to 445 days or more (median, 43). Eleven patients died before engraftment. One received marrow from a sibling donor because of nonengraftment of autologous marrow, and backup autologous marrow was used in one patient.

Discussion

High-dose chemotherapy or allogeneic bone marrow transplantation after the induction of remission has improved the survival of children with AML. The limited availability of histocompatible family donors and the encouraging results obtained with autologous transplantation in refractory AML prompted several trials of autologous transplantation in adults with AML who were in their first remissions.13-15,20-26 Our results, when analyzed on an intention-to-treat basis, did not show that autologous transplantation was superior to intensive consolidation chemotherapy in prolonging event-free survival.

We encountered important problems in our study. A relatively large proportion (32 percent) of eligible patients were not randomized. After randomization to the autologous-transplantation group, 18 percent of the patients dropped out, often because they had relapses before the marrow could be harvested, and among the patients who actually received autologous transplants, the treatment-related mortality was 15 percent.

Other investigators have also encountered these difficulties. In a recent European study of AML,26 35 percent (139 of 393) of patients who were in remission and who did not have histocompatible donors could not be randomized; an additional 26 percent (33 of 125) assigned to undergo autologous transplantation did not complete the planned therapy. Stevens et al. reported that 30 percent of patients in remission in a British study of childhood AML could not be randomized.27 The unusually high rate of relapse before marrow harvest in our study may have been related to the slow recovery of the peripheral blood count after the course of consolidation therapy with etoposide and azacytidine. The death rate of 15 percent from toxic effects in patients who received autologous marrow grafts was related to the slow engraftment of perfosfamide-purged bone marrow.

Zittoun et al. have recently reported that treatment of adults with AML in first remission with autologous transplantation (with unpurged marrow) resulted in better outcomes than intensive consolidation chemotherapy.26 In their study, patients were randomized after the first consolidation course, whereas we randomized our patients after they completed induction chemotherapy. Moreover, there were a total of four courses of chemotherapy in the study by Zittoun et al. and nine in our study. These differences in the study design and the characteristics of patients (children vs. adults) preclude any comparisons between the two studies.

Three trials of autologous transplantation in children with AML have been reported.27-29 Amadori et al. found no significant difference in event-free survival five years after randomizaton between 37 patients who underwent chemotherapy (27 percent) and 35 who underwent autologous transplantation with unpurged marrow (21 percent).28 In Children's Cancer Group Study 2861, allogeneic transplantation was compared with autologous transplantation with the use of perfosfamide-purged marrow.29 The rate of event-free survival three years after transplantation was 51 percent among 58 patients who underwent autologous transplantation, and 55 percent among 17 who underwent allogeneic transplantation. The authors of the Medical Research Council's AML 10 trial,27 conducted in 347 children, concluded that allogeneic transplantation or autologous transplantation after four courses of intensive chemotherapy offered no survival advantage.

Finally, a comment is in order with respect to overall survival in this study as compared with that in other recent AML trials in children. Both the Medical Research Council trial27 and the Berlin–Frankfurt–Münster 87 study of 307 children30 reported overall survival of approximately 50 percent, as compared with 42±2.6 percent in our study. These differences may reflect different characteristics of the patients and the use of a more intensive induction regimen in the Medical Research Council and Berlin–Frankfurt–Münster trials. Intensification of induction chemotherapy can influence survival, regardless of post-remission therapy.31

Supported in part by grants (CA-29691, CA-20549, CA-03161, CA-29139, CA-28476, CA-29281, CA-32053, CA-25408, CA-31566, and CA-41573) from the National Cancer Institute.

We are indebted to Ms. Julie Nucci for her assistance in preparing this manuscript and to Mary Opel and Rita Russo.

Source Information

From the Children's Hospital of Michigan, Barbara Ann Karmanos Cancer Institute, and Wayne State University, Detroit (Y.R.); Emory University, Atlanta (A.M.Y.); the Pediatric Oncology Group Statistical Office and the Department of Statistics, University of Florida, Gainesville (M.N.C.); Baylor College of Medicine, Texas Children's Hospital, Houston (C.P.S.); the H. Lee Moffitt Cancer Center and Research Institute, Tampa, Fla. (J.K.); the University of Florida, Shands Teaching Hospital, Gainesville (J.G.-P.); the University of Alabama at Birmingham, Birmingham (A.C.); the Hurley Medical Center, Flint, Mich. (S.I.); the Midwest Children's Cancer Center, Medical College of Wisconsin, and the Children's Hospital of Wisconsin, Milwaukee (B.C.); and the Dana–Farber Cancer Institute and Children's Hospital, Boston (H.J.W.).

Address reprint requests to Dr. Ravindranath at the Pediatric Oncology Group, 645 N. Michigan Ave., Chicago, IL 60611.

Other contributing authors were Curt I. Civin, M.D. (Johns Hopkins Oncology Center, Baltimore); Mary V. Gresik, M.D. (Baylor College of Medicine, Pathology Department, Houston); and Susana Raimondi, Ph.D. (St. Jude Children's Research Hospital, Memphis, Tenn.). Additional participating Pediatric Oncology Group institutions and their principal investigators are listed in the Appendix.

Appendix

The following institutions and principal investigators also participated in the Pediatric Oncology Group: Alberta Pediatric Oncology Consortium, Edmonton, Alta., Canada — M. Coppes; All Children's Hospital, St. Petersburg, Fla. — J. Barbosa; Boston Floating Hospital, Boston — C. Kretschmar; Bowman Gray School of Medicine, Winston-Salem, N.C. — A. Chauvenet; Brooke Army Medical Center, Fort Sam Houston, Tex. — T. Pick; Cancer Center of Hawaii, Honolulu — R. Wilkinson; Carolinas Medical Center, Charlotte, N.C. — B. Golembe; Children's Hospital and Health Center, San Diego, Calif. — R. Kadota; Children's Hospital, Greenville Health System, Greenville, S.C. — C. Stroud; Children's Hospital of New Orleans, New Orleans — R.P. Warrier; Children's Memorial Hospital, Chicago — M. Kletzel; Christ Hospital and Medical Center, Oak Lawn, Ill. — S. Salvi; City of Hope National Medical Center, Duarte, Calif. — R. Chilcote; Cook–Fort Worth Children's Medical Center, Fort Worth, Tex. — P. Bowman; Dana–Farber Cancer Institute, Boston — H. Grier; Dartmouth–Hitchcock Medical Center, Lebanon, N.H. — E. Larsen; Duke University, Durham, N.C. — J. Kurtzberg; East Carolina University School of Medicine, Greenville, N.C. — T. Holbrook; Fairfax Hospital, Falls Church, Va. — J. Greenberg; Hackensack Medical Center, Hackensack, N.J. — M. Harris; Joe DiMaggio Children's Hospital at Memorial, Hollywood, Fla. — P. Sprinz; Johns Hopkins University, Baltimore — C. Schwartz; Kaiser Permanente Medical Center, Santa Clara, Calif. — L. Young; Keesler Air Force Medical Center, Santa Clara, Calif. — T. Abshire; MDA Cancer Center, Orlando, Fla. — V. Giusti; Maine Children's Cancer Program, Portland — C. Hurwitz; Massachusetts General Hospital, Boston — W. Ferguson; McGill University, Montreal — M. Whitehead; Medical College of Virginia, Richmond — E.C. Russell; Medical University of South Carolina, Charleston — J. Laver; Miami Children's Hospital, Miami — E. Escalon; Mount Sinai School of Medicine, New York — J. Lipton; Naval Regional Medical Center, San Diego, Calif. — D. Reardon; Nemours Children's Clinic, Jacksonville, Fla. — P. Pitel; Oklahoma University Health Sciences Center, Oklahoma City — R. Nitschke; Rhode Island Hospital, Providence — E. Forman; Roswell Park Memorial Institute, Buffalo, N.Y. — M. Brecher; Rush–Presbyterian–St. Luke's Medical Center, Chicago — A. Green; Sacred Heart Children's Hospital, Pensacola, Fla. — T. Jenkins; St. Christopher's Hospital, Philadelphia — E. Douglass; St. Francis Regional Medical Center, Wichita, Kans. — D. Rosen; St. John Hospital, Detroit — H. Sawaf; St. Joseph's Cancer Insitute, Tampa, Fla. — C. Tebbi; St. Vincent Hospital, Green Bay, Wis. — D. Ganick; Stanford University, Palo Alto, Calif. — M. Link; State University of New York at Syracuse, Syracuse — R. Dubowy; Swiss Pediatric Oncology Group, Bern, Switzerland — H. Wagner; Tripler Army Medical Center, Tripler, Hawaii — S. Reddoch; University of Alabama, Birmingham — R. Castleberry; University of Arizona Health Sciences Center, Tucson — J. Hutter; University of Arkansas, Little Rock — D. Becton; University of California at Davis, Sacramento — J. Ducore; University of California at San Diego, San Diego — F. Kung; University of Florida, Gainesville — P. Mehta; University of Kansas, Kansas City — T. Vats; University of Massachusetts Medical School, Worcester — M. Schwenn; University of Miami School of Medicine, Miami — S. Toledano; University of Mississippi Medical Center, Jackson — J. Pullen; University of Missouri, Columbia — N. Hakami; University of Puerto Rico, San Juan — N. Barrios; University of Rochester Medical Center, Rochester, N.Y. — R. Duerst; University of South Alabama, Mobile — Y.-M. Yang; University of South Florida, Tampa — E. Hvizdala; University of Texas, San Antonio — P.J. Thomas; University of Texas at Galveston, Galveston — M. Haggard; University of Texas, Southwestern Medical School, Dallas — G. Buchanan; University of Vermont College of Medicine, Burlington — J. Dickerman; University of Virginia, Charlottesville — P. de Alarcon; Walter Reed Army Medical Center, Washington, D.C. — D. Maybee; Warren Clinics, Tulsa, Okla. — G. Kirkpatrick; Washington University School of Medicine, St. Louis — T. Vietti; West Virginia University Health Science Center, Charleston — K. Starling; West Virginia University Health Services Center, Morgantown — A.K. Ritchey; Wilford Hall Air Force Medical Center, Lackland Air Force Base, Tex. — T. Trippet; Yale University School of Medicine, New Haven, Conn. — J. Van Hoff.

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