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Original Article
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Volume 329:459-465 August 12, 1993 Number 7
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Radioimmunotherapy of B-Cell Lymphoma with [131I]Anti-B1 (Anti-CD20) Antibody
Mark S. Kaminski, Kenneth R. Zasadny, Isaac R. Francis, Adam W. Milik, Charles W. Ross, Scott D. Moon, Shelley M. Crawford, Jeanne M. Burgess, Neil A. Petry, Gregory M. Butchko, Stephan D. Glenn, and Richard L. Wahl

 

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ABSTRACT

Background Many patients with non-Hodgkin's lymphomas are not cured by current therapies, and new approaches to treatment are needed. As part of an ongoing phase 1 study, we examined the effect of radioimmunotherapy with 131I-labeled B-cell-specific anti-CD20 monoclonal antibody in 10 patients with CD20-positive B-cell lymphomas in whom primary chemotherapy had failed.

Methods and Results Anti-B1 (anti-CD20) mouse monoclonal antibody trace-labeled with 131I (15 mg containing 5 mCi) was given intravenously at approximately one-week intervals: first, without pretreatment with unlabeled anti-B1 antibody, to all 10 patients; then with pretreatment with 135 mg of unlabeled antibody, to 8 patients; and then, with pretreatment with 685 mg, to 2 patients. Serial quantitative gamma-camera images and measures of whole-body radioactivity were obtained after each tracer dose. All known disease sites larger than 2 cm could be imaged. The effect of a pretreatment dose of unlabeled anti-B1 antibody on targeting of the tumor with the radiolabeled antibody was variable.

The pretreatment dose of unlabeled antibody that produced the highest ratio of the tumor dose to the whole-body dose in tracer studies was then used to deliver higher doses of radioactivity for radioimmunotherapy in nine patients. Three patients received doses designed to deliver 25 cGy to the whole body (two patients treated twice, six to eight weeks apart), four patients received 35 cGy (one patient treated twice), and two patients received 45 cGy (one patient treated twice); each dose contained 34 to 66 mCi of activity. Six of the nine treated patients had tumor responses, including patients with bulky or chemotherapy-resistant disease: four patients had complete remissions, and two had partial responses. Three patients had objective responses to tracer infusions before they received radioimmunotherapeutic doses. Of the four patients with complete remissions, one remained in remission for eight months and the other three continue to have no disease progression (for 11, 9, and 8 months). There was mild or no myelosuppression.

Conclusions Radioimmunotherapy with [131I]anti-B1 antibody is a promising new treatment for lymphoma.


Despite the use of various combined chemotherapeutic regimens for advanced-stage intermediate- and high-grade lymphomas, roughly half of patients treated do not have a complete remission or eventually have a relapse after a remission. This situation has not improved noticeably in almost two decades1,2. Treatment with standard-dose salvage chemotherapy rarely results in durable remissions and often has serious toxicity. Although the use of high-dose chemotherapy with bone marrow transplantation has shown promise, not all patients derive long-term benefit from this treatment3. Furthermore, a curative treatment for patients with advanced low-grade lymphoma still remains to be clearly established4. New therapeutic approaches are needed.

Radioimmunotherapy is promising in this regard. In this form of treatment, radioisotope-labeled monoclonal antibodies that can recognize and bind tumor-associated antigens are administered systemically. Such radiolabeled antibodies may preferentially target radioactivity to tumor sites, sparing normal tissues. Depending on the radioisotope, the radiation emitted from a radiolabeled antibody bound to a tumor cell may also kill nearby malignant cells that do not express the target antigen at which the antibody is directed. Also, the antibody carrying the radioisotope may affect the tumor either by itself or through indirect mechanisms involving interactions with host immune mechanisms.

In this report, we present the results of an ongoing phase 1 clinical trial evaluating the tumor targeting, antitumor effects, and toxicity of 131I-labeled anti-B1 antibody, a mouse monoclonal antibody directed against the CD20 B-lymphocyte-associated surface-membrane antigen that is widely expressed by normal and malignant B cells.

Methods

Preparation and Iodination of the Anti-B1 Antibody

The mouse IgG2a monoclonal antibody anti-B1 (anti-CD20), provided by the Coulter Corporation (Hialeah, Fla.), binds to a 35-kd cell-surface phosphoprotein expressed by more than 95 percent of normal B cells isolated from peripheral blood, lymphoid tissues, and bone marrow and more than 90 percent of B-cell lymphomas5. It does not bind T cells, granulocytes, monocytes, erythrocytes, hematopoietic stem cells, or any normal nonhematopoietic tissues5.

The antibody was isolated from serum-free hybridoma supernatants produced in cartridge-type bioreactors and purified by ion-exchange chromatography. The resulting preparation was more than 98 percent pure monomeric IgG, sterile and free of pyrogens or adventitious viruses.

Radioiodination was performed according to the iodogen method6. After passage of the radiolabeled antibody preparation through an ion-exchange resin column, more than 90 percent of radioactivity was protein bound as assessed by thin-layer chromatography. The mean specific activities of trace-labeled and radioimmunotherapeutic-dose preparations were 0.83 and 8.8 mCi per milligram, respectively. A rapid direct cell-binding assay with a one-hour incubation period was performed before infusion, to verify preservation of immunoreactivity, as described previously7. Lyophilized target B cells (Coulter) were reconstituted with 2 percent bovine serum albumin in phosphate-buffered saline and incubated with radiolabeled antibody under conditions of antigen excess and in the presence or absence of excess unlabeled anti-B1 antibody. For trace-labeled preparations, direct cell binding measured 58 percent on average; for therapeutic-dose preparations, the average was 49 percent. These are minimal estimates of immunoreactivity not extrapolated to conditions of infinite antigen excess8.

All radiolabeled antibody preparations were sterile-filtered and determined to be pyrogen-free by limulus amebocyte lysate assay before injection. The preparation and administration of the antibody conformed to federal regulations (Notice of Claimed Investigational Exemption for a New Drug).

Selection of Patients

Patients eligible for this study were adults with non-Hodgkin's lymphoma who had relapsed after having received at least one chemotherapy regimen or who had had no response to at least one regimen, and whose tumor tissue was reactive with either anti-B1 antibody (as demonstrated by immunoperoxidase staining of cryopreserved tumor specimens) or with L26 antibody (as demonstrated by staining of paraffin-embedded tissue); both anti-B1 and L26 antibodies specifically bind the CD20 antigen9. The patients were also required to have iliac-crest bone marrow biopsy samples showing that less than 25 percent of the hematopoietic marrow elements were lymphoma cells. They were required to have undergone no other treatment for at least four weeks and to have an absolute granulocyte count above 1500 per cubic millimeter and a platelet count above 100,000 per cubic millimeter at entry, normal hepatic and renal function, no other serious illnesses, a Karnofsky performance score of at least 60, a life expectancy of at least three months, measurable disease, and no human serum antimouse antibodies. All patients gave written informed consent to their participation in the study, which was approved by the institutional review board of the University of Michigan.

Antibody Administration

All patients were hospitalized and received anti-B1 antibody trace-labeled with 131I (15 mg containing 5 mCi) intravenously over a 30-minute period. To evaluate the effect of giving unlabeled antibody before radiolabeled antibody on the distribution of radiolabeled antibody and tumor targeting, a second trace-labeled dose was given approximately one week later, immediately after a 90-minute infusion of 135 mg of unlabeled anti-B1 antibody. Depending on the availability of antibody and the patient's clinical status, a third trace-labeled dose was given one to two weeks later, after a 90-minute infusion of 685 mg of unlabeled antibody.

At least one week after the last trace-labeled dose was given, a dose with higher radioactivity -- the radioimmunotherapeutic dose -- was administered. This dose (15 mg) was given with the pretreatment dose of unlabeled antibody that had previously produced the highest ratio of the tumor dose to the whole-body dose. The level of radioactivity in the therapeutic dose was adjusted for each patient so that he or she would receive a specified dose of whole-body radiation predicted by the results of studies with the trace-labeled dose (or doses). Groups of at least three patients were scheduled to receive escalating whole-body doses, which started at 25 cGy and were increased by 10-cGy increments until a maximal tolerated dose not requiring support by bone marrow transplantation was determined. Patients were eligible for retreatment after eight weeks if they did not have human antimouse antibodies, had had no dose-limiting toxic reactions, and had stable disease or tumor regression with measurable persistent disease, and if their blood counts, levels of hepatic and renal function, and performance status were in the range that was originally required for entry. Retreatment consisted of a trace-labeled dose (usually with the same pretreatment dose of unlabeled antibody used for the previous radioimmunotherapeutic dose) followed one week later by a radioimmunotherapeutic dose (also with the same pretreatment dose of unlabeled antibody) that had been adjusted to deliver the same dose of whole-body radiation delivered by the previous radioimmunotherapeutic dose.

Diphenhydramine (50 mg) and acetaminophen (650 mg) were given orally as premedication one hour before each infusion. Potassium iodide was given orally (two drops orally three times daily), beginning the day before the first infusion of antibody and continuing until 14 days after the last infusion, to inhibit uptake of free iodine by the thyroid. Potassium perchlorate (200 mg three times a day for seven days) was given in addition to potassium iodide to patients receiving radioimmunotherapy, beginning the day of the therapeutic infusion. Patients were monitored for alterations in vital signs and for adverse reactions every 15 minutes during infusions. After they received a radioimmunotherapeutic dose, they were isolated in lead-shielded rooms until their whole-body radiation level was less than 30 mCi according to ionization-chamber measurements.

Dosimetry and Imaging Studies

Serial conjugate anterior and posterior whole-body and spot gamma-camera scans, as well as whole-body radioactivity counts recorded by sodium iodide scintillation probes, were obtained one hour after administration of the trace-labeled dose and then daily for at least five days as previously described10. Post-radioimmunotherapy scanning was begun after the whole-body radioactivity level fell to less than 30 mCi. Outlines of the regions of interest were drawn around normal organs, imaged tumors, and appropriate background regions by a computer. Time-activity curves (the level of radioactivity per gram of tissue plotted against time) corresponding to these regions were then generated and fitted by a least-squares regression program to derive an estimate of cumulative activity. The weights of organs and tumors were calculated from their volumes recorded on computed tomography (CT) when CT scans were available; otherwise, standard values for organ masses were used11. Dosimetric estimates were then made according to the method of the Medical Internal Radiation Dose Committee12,13,14,15.

Radioactivity clearance was also determined with a gamma counter in sequential blood samples drawn immediately after infusion and during the following 120 hours. Serum samples were also obtained to detect immune-complex formation (measured by high-performance liquid chromatography and C1q binding assays) within two hours after infusion. Urine samples were also collected at designated intervals after infusion to measure the renal excretion rate.

Gamma-camera scans were interpreted by a single experienced reader and compared with findings at prestudy physical examinations, body CT scans, and other appropriate radiographic studies to determine the sensitivity of tumor imaging10.

Evaluation of Toxicity

Toxicity was scored according to the National Cancer Institute's Common Toxicity Criteria. Complete blood-cell and platelet counts were obtained immediately after each infusion and then 2, 4, 24, 72, and 120 hours after infusion. After the patients' discharge from the hospital, blood counts were obtained weekly for at least eight weeks. Hepatic-enzyme, renal, and electrolyte studies were performed at least twice during the week after an infusion and once every two weeks for the first two months after discharge. Serum complement levels (C3 and C4) were assayed within two hours after infusion. The peripheral-blood immunophenotype was determined by flow cytometry before and 24 hours after infusion of trace-labeled antibody and one to two months after radioimmunotherapy. Direct staining of Ficoll-Hypaque-separated mononuclear cells was performed with anti-B1 and anti-CD19 antibodies to identify B cells and with anti-CD3 antibodies to identify T cells. Other antibodies used for special studies included anti-CD4, anti-CD8, anti-CD14, and anti-CD45 antibodies and other irrelevant (control) subclass-matched antibodies.

Serum was examined for human antimouse antibodies in samples obtained before study, weekly until two months after the last antibody infusion, and monthly thereafter, by means of a sandwich enzyme-linked immunosorbent assay described previously10. Serum immunoglobulin concentrations were measured and thyroid-function tests performed before study, one month after radioimmunotherapy, and several months after therapy.

Tumor Response

Tumor response was assessed during the tracer studies before radioimmunotherapy, four to six weeks after therapy, and every two to three months thereafter. A complete remission was defined as the complete disappearance of all detectable disease for a minimum of four weeks, a partial response as a reduction of at least 50 percent in the sum of the products of the longest perpendicular diameters of all measurable lesions for a minimum of four weeks, and disease progression as an increase of at least 25 percent in the diameters or the appearance of new lesions.

Results

The first 10 patients who entered the study are described here, and their characteristics are shown in Table 1. All were men. Half the patients had low-grade lymphomas, and half had intermediate-grade lymphomas. At entry, three patients had high tumor burdens (>500 g on CT scanning and physical examination), two had low tumor burdens (<50 g), and five had intermediate tumor burdens (50 to 500 g). Generally, the patients had been heavily treated with chemotherapy before entry (mean number of regimens per patient, 2.7). Half had chemotherapy-resistant disease, indicated by a response lasting for less than one month after the last chemotherapeutic treatment.

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Table 1. Clinical Characteristics of 10 Patients with B-Cell Lymphoma.

 
Gamma-camera scans obtained after the administration of trace-labeled doses of [131I]anti-B1 antibody demonstrated distinct tumor imaging of all known disease sites larger than 2 cm in all patients (i.e., in all of 30 known sites; range, 1 to 9 sites per patient). Lesions 1 to 15 cm in diameter could be detected, including intrasplenic tumors (Figure 1).


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Figure 1. Gamma-Camera Images of Patients with B-Cell Lymphomas after Injection of 131I-Labeled Anti-B1 Antibody.

In Panel A, an anterior view of Patient 9 obtained 120 hours after trace-labeled antibody injection, there are multiple tumors (arrows) 2 to 6 cm in diameter involving the neck, the right axilla, and the iliac, inguinal, and femoral regions. In Panel B, a posterior view of Patient 2 obtained 235 hours after trace-labeled antibody injection, there is distinct focal uptake (arrows) within the spleen consistent with intrasplenic tumor targeting. A CT scan of this patient also demonstrated low-attenuation lesions in the spleen consistent with involvement by lymphoma.

 
Pretreatment with unlabeled anti-B1 antibody was performed to determine whether it would enhance the subsequent access of radiolabeled antibody to tumors through partial or complete presaturation of nonspecific binding sites or reservoirs of nonmalignant B cells (especially those in the spleen). Such pretreatment consistently prolonged blood and whole-body clearance of radioisotope, as compared with the administration of trace-labeled antibody without pretreatment, but its effect on radiolabeled-antibody targeting of tumor relative to normal tissues was variable. Of the eight patients who received a 135-mg pretreatment dose of unlabeled antibody, two had an increase of more than 20 percent in the tumor-dose: whole-body dose ratio as compared with the ratio determined after a previous trace-labeled dose given without pretreatment, and three patients had no substantial improvement. The results in the three other patients could not be assessed because of overlap of the tumor region with neighboring organs involved in free-iodine excretion or decreased tumor volume after infusion of trace-labeled antibody. Of the two patients given trace-labeled doses preceded by a 685-mg pretreatment dose, the results in both were also unassessable because of tumor responses occurring after these infusions.

The calculated doses of radiation delivered to tumors by trace-labeled antibody exceeded those to any uninvolved organ in five of the seven patients in whom radiation delivery could be assessed (Table 2). A dose of up to 24.1 cGy per millicurie (mean ±SE, 10.6 ±2.76) could be delivered to the tumor. Features unique to the two patients with poorer tumor targeting that might account for a suboptimal outcome were gross splenomegaly (750 g) in Patient 1 (the spleen could act as an "antigenic sink" for the labeled antibody) and a high degree of sclerosis in the tumor in Patient 5 (which might limit the access of antibody to tumor cells).

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Table 2. Doses of Radiation Delivered by [131I]Anti-B1 Antibody to Various Sites.

 
Nine patients received radioimmunotherapeutic doses and could be evaluated for response and toxicity (Table 3). One patient did not receive a therapeutic dose because of rapid tumor progression and deterioration of physiologic status during tracer studies, which resulted in his becoming ineligible for protocol treatment. Four patients were treated twice (with about two months between treatments). An estimated dose of 25 to 45 cGy was delivered per dose to the whole body, with 34 to 66 mCi per dose. Six of the nine patients had substantial tumor responses: four patients had complete remissions, and two had partial responses. Responses were observed in patients with extensive or bulky disease or chemotherapy-resistant disease (Figure 2). Responses began in three patients after they received trace-labeled doses, even before they received radioimmunotherapeutic doses. All four patients with complete remissions entered remission after they received only one radioimmunotherapeutic dose; a second radioimmunotherapeutic dose resulted in a mixed response in one patient (definite regression in some tumors and progression in others), no further response in two, and no change in a residual radiographic abnormality in one. One complete remission lasted 8 months, and three remissions have continued without disease progression for 8 to 11 months. Minimal toxicity was observed in all patients with complete evaluations. Most had either reversible grade 1 myelosuppression (leukopenia, thrombocytopenia, or both) four to seven weeks after radioimmunotherapy, or no toxic reactions. One patient had a mild rigor and fever during infusion of a radioimmunotherapeutic dose.

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Table 3. Responses to Radioimmunotherapy.

 

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Figure 2. Tumor Responses to [131I]Anti-B1 Antibody.

Abdominal CT images of Patient 4 show a large chemotherapy-resistant retroperitoneal mass before study entry (Panel A) and its regression after radioimmunotherapy (Panel B). This response occurred after the first radioimmunotherapeutic dose; no substantive radiographic changes occurred after a second therapeutic dose.

Thoracic CT images of Patient 2 before study entry (Panel C) and six weeks after one radioimmunotherapeutic dose of 45 mCi (Panel D) show regression of chemotherapy-resistant mediastinal and paratracheal lymphadenopathy.

 
Peripheral-blood flow cytometry revealed that CD20-positive B cells constituted 2 to 20 percent of circulating mononuclear cells at base line in all patients. The percentage of these B cells had decreased in most patients by 24 hours after tracer infusion, with complete depletion of these cells in three patients. CD20 cell counts returned to base line one to three months after radioimmunotherapy; there was no evidence of increased rates of infection. The levels of circulating CD3-positive T cells did not change significantly. Serum immunoglobulin levels also did not change greatly during follow-up in the patients, including the five who had low levels before the study. Human antimouse antibodies were detected in two patients 53 and 81 days after the first trace-labeled antibody infusion. Hypothyroidism induced by irradiation of the thyroid has not been observed.

Discussion

The high rate of tumor responses so far in this ongoing study, together with the low level or absence of toxicity, is promising. Four of the six responses observed have been complete and durable. Responses could be achieved with a relatively short course of treatment in patients with bulky or extensive disease or chemotherapy-resistant disease. Although the duration of complete remission in some of our patients has not yet been determined, this therapy appears to offer, at the very least, excellent palliation of disease and the potential for repeated treatments if relapse occurs.

These early results appear to be superior to those of previously published trials of therapy based on the use of monoclonal antibodies for B-cell lymphoma, but the number of patients in these studies is small. Trials of unlabeled antibody have demonstrated occasional tumor responses, generally incomplete and short-lived16,17,18,19,20,21,22. Similarly, tumor responses to antibody-toxin conjugates (immunotoxins) have been infrequent and rarely complete23,24,25. Toxic reactions to this form of treatment have included hypoalbuminemia, fever, myalgia, rhabdomyolysis, aphasia, and capillary leak. Trials with radiolabeled B-cell-directed antibodies in which a dose range similar to the range in this trial was used have resulted predominantly in short partial responses, often accompanied by substantial myelosuppression10,26,27,28,29. Using doses of radioactivity almost 10-fold higher than ours, which required that cryopreserved autologous bone marrow be available, Press et al. induced complete remissions in four patients with an anti-CD37 antibody (MB-1) labeled with 131I30. All four patients had severe myelosuppression, and one required bone marrow reinfusion. Only patients with relatively small tumor burdens were treated.

Several factors may account for the encouraging results of the present trial. Anti-B1 antibody appears to be a superior tumor-targeting agent, and the ability to image all tumors larger than 2 cm and even metastases within the spleen (an organ rich in normal B cells) suggests a potential diagnostic role for the radiolabeled antibody. These results compare favorably with those of studies of the LL2 antibody26 and are superior to those of studies of the MB-1 antibody10 and the anti-CD21 antibody OKB731. The radiation dose delivered to tumor by [131I]anti-B1 antibody (10.6 ±2.76 cGy per millicurie) appears to be at least double that reported for other radiolabeled B-cell antibodies,10,26,27,31 possibly because of the specificity of this antibody for B cells. In contrast to other antigens, CD20 antigen does not modulate after antibody binding5 (i.e., disappear from the cell surface through cytosolic internalization or cell-surface-membrane shedding). Internalization of radiolabeled antibody may result in dehalogenation of antibody and subsequent release of free iodine from the cell32; the absence of such a mechanism may allow prolonged retention of intact radiolabeled antibody by the targeted cell. Better tumor targeting appeared to translate into improved tumor responses in our patients, and patients with relatively poorer targeting generally did not respond to treatment. This may indicate that the tumor responses observed were due to antibody-targeted radiation rather than simply to whole-body irradiation.

In one patient with gross splenomegaly (Patient 1), pretreatment with antibody improved the uptake of radiolabeled antibody. When this patient did not receive pretreatment, radioactivity was localized predominantly in the spleen and no tumor sites were detectable; but when he received a 135-mg pretreatment dose, splenic uptake of radioisotope was much reduced and multiple tumor sites became detectable. Pretreatment with unlabeled antibody may help radiolabeled antibody bypass an antigenic sink (such as the spleen) and allow better access to tumor sites through competition between unlabeled and labeled antibody.

A low dose rate is associated with this form of delivery of radiation, and data from studies in animals suggest that low-dose-rate irradiation may be more therapeutically effective than instantaneous irradiation delivered fractionally by conventional external beam33,34,35. Moreover, low-dose-rate irradiation can induce apoptosis in lymphoid cell lines, and binding of antibody (including anti-B1 antibody) can be synergistic in the induction of this effect36,37.

The antibody moiety of the [131I]anti-B1 conjugate may also have antitumor effects. Anti-B1 antibody can induce both antibody-dependent38 and complement-dependent cytolysis,39 probably because its Fc portion is of the IgG2a subclass. Also, anti-B1 antibody can directly induce apoptosis in certain human B-cell-lymphoma cell lines (Macklis R: personal communication). We have found that in nude mice bearing human B-cell xenografts, unlabeled anti-B1 antibody can have inhibitory effects on tumor growth comparable to those of the labeled antibody38. Our observation of tumor responses during tracer studies in the present trial also supports an antitumor role for the anti-B1 antibody moiety. However, since no patients received only unlabeled antibody and because up to 120 cGy could be delivered to tumors by trace-labeled doses, at present we cannot exclude a targeted-radiation effect.

Thus, it is possible that at least six different antitumor mechanisms may be working in concert in this form of treatment: antibody-targeted radiation, low-dose-rate irradiation and its incompletely understood effects, whole-body irradiation, antibody-dependent cellular cytolysis, complement-dependent cytolysis, and antibody-induced apoptosis.

This trial is still in its early stages. As escalation of radiation doses continues, it will be of interest to determine whether the frequency and duration of response are enhanced as the maximal tolerated radiation dose is approached. Even at current dose levels, however, this novel, and so far relatively nontoxic treatment appears to have substantial potential as therapy for lymphoma, either by itself or in combination with other treatments.

Supported in part by grants (RO1-CA-56794 [to Dr. Kaminski] and PO1-CA-42768 [to. Dr. Wahl]) from the National Cancer Institute and a grant (MO1-RR-00042) from the National Institutes of Health.

We are indebted to Jeanette Roesner, Jeffery C. Burke, and Susan Fisher for technical assistance, to all the physicians who referred patients to us for this study, to the nursing staff of the Clinical Research Center of the University of Michigan Hospital for their excellent care of the patients, and to Pamela Taylor for assistance in the preparation of the manuscript.


Source Information

From the Divisions of Hematology/Oncology (M.S.K., A.W.M., J.M.B.) and Nuclear Medicine (K.R.Z., S.D.M., S.M.C., N.A.P., R.L.W.), Department of Internal Medicine, and the Departments of Radiology (I.R.F., R.L.W.) and Pathology (C.W.R.), University of Michigan, Ann Arbor; and the Coulter Corporation (G.M.B., S.D.G.), Hialeah, Fla.

Address reprint requests to Dr. Kaminski at the Division of Hematology/Oncology, Department of Internal Medicine, University of Michigan Medical Center, 102 Observatory St., Ann Arbor, MI 48109-0724.

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