Hodgkin's Disease in the Setting of Human Immunodeficiency Virus Infection Alexandra M. Levine* * Correspondence to: Alexandra M. Levine, M.D., Division of Hematology, University of Southern California (USC), USC/Norris Cancer Hospital, 1441 Eastlake Ave., MS 34, Los Angeles, CA 90033. Although Hodgkin's disease (HD) is not usually associated with congenital or acquired immunodeficiency disorders, recent evidence would suggest a statistically significant increase in HD among individuals infected with human immunodeficiency virus (HIV). In the setting of underlying HIV infection, clinical and pathologic characteristics of HD may differ from usual expectations. Thus, 70%-100% of HIV-infected patients with HD present with systemic "B" symptoms. Likewise, disseminated, stage III or IV disease is reported in approximately 75%90%. Bone marrow is a common site of extranodal HD, occurring in 40%-50%. Complete response rates after multiagent chemotherapy range from approximately 45% to 70%, although median survival has been only in the range of approximately 18 months. Hematologic toxicity from multiagent chemotherapy may be substantial, even with the use of hematopoietic growth factor support. It is apparent that new strategies of therapeutic intervention must be explored. Relationship Between Hodgkin's Disease and Underlying Immunodeficiency Non-Hodgkin's lymphoma is known to occur with increased frequency in various settings of congenital, acquired, or iatrogenic immunosuppression (1-4). It was thus not surprising to observe significantly increased rates of lymphoma in patients infected with human immunodeficiency virus (HIV). Similarly, the other current acquired immunodeficiency syndrome (AIDS)-defining cancers, Kaposi's sarcoma and cervical cancer, are also associated with diverse types of abnormal immunity, including immunosuppression related to organ transplantation or to therapy for autoimmune or malignant disorders (2,3,5,6). Within the context of this background, Hodgkin's disease (HD) represents a somewhat different situation. Thus, while the risk of HD is increased in children with ataxia telangiectasia (7), the magnitude of this increase is quite modest, and HD is not seen with increased frequency in other types of congenital immune deficiency disease. Furthermore, the incidence of HD is not increased in the setting of organ transplantation or in the setting of prior cancer chemotherapy or immunosuppressive therapy for autoimmune disease (2,3). The expectation that HIV-infected patients would be at risk for HD was thus not initially considered a prominent concern. Epidemiology of De Novo HD In patients who are not infected by HIV, the epidemiology of HD has been well described. Correa, MacMahon, and others (8-10) have demonstrated a clear relationship between geographic and socioeconomic factors and the ensuing clinicopathologic characteristics of HD. Thus, the "type 1 pattern" of HD is seen in underdeveloped areas of the world, associated with lower socioeconomic conditions. In this setting, two age peaks of disease are observed, with the first in childhood (primarily affecting boys) and the second in the fifth or sixth decade. The pathologic spectrum of HD in the type 1 setting includes a predominance of mixed-cellularity or lymphocyte-depletion disease, with proclivity toward advanced stage and presence of systemic "B" symptoms. The overall prognosis of such patients is relatively poor, when compared with that of patients in other settings and with other patterns of disease. The "type 3 pattern" of HD is seen in industrialized nations and is also characterized by two modal peaks of disease (8-10). However, in these areas of higher socioeconomic background, the first modal peak occurs in adolescent or young-adult females, who tend to present with nodular sclerosis HD, often presenting with rather limited stage disease localized to the mediastinal lymph nodes. The second peak occurs in the fifth and sixth decades, is seen primarily in males, and may be associated with a broader spectrum of pathologic subtypes. Various characteristics associated with higher socioeconomic status have been described with increased frequency in young patients who develop HD within type 3 areas. In the "type 2 pattern," all three age peaks of disease are encountered, with a broad spectrum of pathologic subtypes and clinical outcome. This pattern has been described in developing areas of the world, such as Mexico. Of interest, areas of lower socioeconomic status within the United States have been described in which the clinicopathologic spectrum of HD resembles that seen in type 2 or developing nations (11). Because of these divergent epidemiologic, clinical, and pathologic characteristics, any differences between HIV-associated and de novo HD must be considered within the context of the usual expectations for HD in that particular region under study. Immune Function in De Novo HD Defects in cell-mediated immunity have been well described in patients with de novo HD, occurring even in patients with early stage disease and in those who have been free of HD for many years (12). Thus, patients with HD are often anergic to delayed cutaneous hypersensitivity testing, as described by Dorothy Reed as early as 1902 [see (13)]. While more common in patients with advanced, symptomatic HD, dinitrochlorobenzene skin testing may also be abnormal in patients with good prognosis, early stage HD (12). In vitro testing of immune function is also abnormal in patients with de novo HD. Thus, decreased mitogenic responses to phytohemagglutinin and to concanavalin A have been described, even prior to the initiation of chemotherapy (14). While significant reductions in T cells have been described in peripheral blood and spleen of approximately 30% of patients with untreated, advanced HD (15), no alteration in the ratio of helper or cytotoxic/suppressor T cells has been found; moreover, there is no evidence of cellular activation (15). Furthermore, most patients with HD do not have lymphocytopenia, indicating that the major cell-mediated defect is a functional impairment, as opposed to an absolute depletion of T cells in blood or tissues. These defects of cell-mediated immunity may also be surmised by the fact that patients with HD may be at increased risk for certain infections known to be associated with depressed T-cell function. Of interest, increased susceptibility to tuberculosis among patients with HD was well described as early as 1928, while the earliest description of HD was complicated by the fact that some of Thomas Hodgkin's initial HD patients actually had tuberculosis (16). Furthermore, in a large series of 300 adult patients with HD, Notter et al. (17) noted the development of opportunistic infections in 4%, consisting of Pneumocystis carinii pneumonia, disseminated vaccinia, herpes zoster, and progressive multifocal leukoencephalopathy, among others. When considering the immune function of patients with HIV-related HD, it is important to realize that any immune defect etiologically related to HIV will, by definition, be augmented by the known defects in cell-mediated immunity that are inherent to HD itself. Incidence of HD Among HIV-Infected Persons Of interest, at the outset of the AIDS epidemic, the incidence of de novo HD appeared to have decreased among HIV-negative persons in New York and Los Angeles (18,19). In the evaluation of young, single men in New York City (presumably including HIV-infected individuals or homosexual men at risk for HIV), stationary rates were documented, while an actual decrease in HD among married men in New York State was observed at the same time (18). In 1992, Hessol et al. (20) noted an increase in the standardized morbidity ratio for HD among HIV-infected homosexual men from San Francisco. By use of data from 6704 homosexual men enrolled in the San Francisco City Clinic HIV Cohort Study, cases of HD were ascertained through the computer-matched identification of participants in the population-based Northern California Cancer Center registry. Comparisons were made with rates determined in the general population by use of the Surveillance, Epidemiology, and End Results (SEER)1 cancer registry. A total of 90 cases of non-Hodgkin's lymphoma were identified, along with eight cases of HD. The age-adjusted standardized morbidity ratio for HD among the HIV-infected men was 5.0 (95% confidence interval [CI] = 2.0-10.3), indicating a statistically significant increase. Furthermore, when these data were compared with those from the SEER registry, the excess risk of HD among HIV-infected homosexual men was 19.3 cases per 100 000 person-years, again indicating a significant increase. While pathologic review was not performed, and while diagnostic misclassification is known to occur, especially in lymphocyte-depleted HD (21,22), the data did indicate that the incidence of HD may have increased in HIV-infected homosexual men (20). More recently, Lyter et al. (23) described an increase in HD among homosexual and bisexual men, who were followed as part of the national Multicenter AIDS Cohort Study (MACS). Thus, within the Pittsburgh MACS cohort, who were followed between 1984 and 1993, two cases of HD were seen among 430 HIV-infected men (with 2344 person-years of follow-up) versus no cases among 769 HIV-negative control subjects (followed for 5708 person-years). While consisting of only two cases, the standardized incidence ratio for seropositives was increased 19.8-fold (95% CI = 2.4-71.5) when compared with that for seronegatives. Furthermore, when these data were compared with those from the population-based SEER registry, the rate of HD among HIV-positive men was 85 per 100 000 person-years versus 4.3 per 100 000 person-years in the general population. In an attempt to ascertain the full spectrum of malignant disease occurring in association with HIV infection, Goedert and colleagues (24) performed a linkage analysis in which all cases of cancer reported in over 98 000 cases of AIDS reported to the Centers for Disease Control and Prevention were linked, case by case, to the population-based cancer registries in the United States. AIDS-related cancers were defined as those that had increased statistically after an initial AIDS diagnosis, with increasing prevalence from 5 years before the diagnosis of AIDS, through 2 years after the initial AIDS diagnosis. In this analysis, the risk of HD was increased 7.6-fold, with the relative risk (RR) statistically increasing from the period prior to AIDS to that occurring after the initial diagnosis of AIDS. Significant increases in HD have also recently been documented in the National Cancer Institute Hemophilia Cohort (RR = 5.6) (25); in injection drug users with AIDS in New Jersey (odds ratio [OR] = 4.2; 95% CI = 1.4-14.7; P = .04) (26); in HIV-infected individuals from Denver, CO (27); and in homosexual men from New South Wales, Australia (28). In the latter report, the RR of HD was 18.3 (95% CI = 8.4-35), with the increase in risk confined to the 2 years immediately before an AIDS diagnosis and the period after AIDS was diagnosed. These data would be consistent with the concept that HD is a late manifestation of HIV disease, which may become even more apparent as HIV-infected individuals live long enough to develop the disease. HIV-Infected Populations at Risk for HD Early studies from Europe indicated that HD did occur in HIV-infected individuals, although no formal population-based comparisons were published at that time. However, Monfardini et al. (29) from the Italian Cooperative Group for AIDS-related Tumors sent 1962 questionnaires to various professional groups of oncologists, infectious disease specialists, and others, in an attempt to ascertain potential cases of HD among HIV-infected individuals. A total of 35 cases of HD and 95 cases of lymphoma were identified. Of interest, 89% of the patients with HD had a history of injection drug use, while an additional 9% were homosexual with a history of injection drug use. In contrast, a history of injection drug use was present in 68% of the lymphoma patients, while 5% had a history of both injection drug use and homosexuality. While retrospective and biased by the method of case ascertainment, this study suggested the possibility that injection drug use might be a specific risk factor for HIV-associated HD. Subsequent work from France (30) confirmed this suggestion, with 38% of 45 HIV-infected patients with HD providing a history of injection drug use, versus only 12.5% of 168 patients with non-Hodgkin's lymphoma. Roithmann et al. (31) confirmed the increased likelihood of HD among injection drug users versus homosexual men from France, while investigators from Spain (32) also documented a similar relationship, with 85% of 46 cases of HD occurring in injection drug users and 9% occurring in homosexual men. Furthermore, Ahmed et al. (33) also noted that the incidence of HD was three to 10 times higher among prisoners in the United States who were injection drug users, versus those who were not, although the overall incidence of HD had not increased in these prison inmates. While these earlier studies seemed to indicate an increased proclivity for HD among HIVinfected injection drug users, subsequent studies have not really confirmed this fact. Thus, statistically significant increases in HD have now been described in HIV-infected hemophiliacs (25) as well as in HIV-infected homosexual men (23,28). More time will be required to elucidate the true increase in risk of HD among injection drug users, when compared to other HIV-infected populations. Relatively little is currently known about the precise level of immune dysfunction in patients with HIV-related HD. Ames et al. (34) evaluated 23 such patients, whose median CD4 cell count was 201/mm3, ranging from 7 to 882/mm3. In another report published in 1991 from Italy (35), the median CD4 cell count in 38 patients was 254/mm3 (range, 27-1316/mm3). A study from France published in 1993 (30) described 45 patients with HIV-related HD in whom the median CD4 cell count was 306/mm3. More recently, CD4 cells were determined at baseline in a group of 21 patients with HIV-related HD (36) who were treated prospectively as part of the AIDS Clinical Trials Group (ACTG study #149). The median CD4 cell count was 128/mm3, ranging from 2 to 972/mm3. The apparently lower median CD4 cell count seen in this latter series may reflect simple chance alone, or it may be reflective of the fact that this series was accrued later in the epidemic, at a time when patients are living longer, despite falling CD4 cell counts. Most patients with HIV-related HD have not had an AIDS-defining diagnosis prior to the onset of HD. Thus, in the group of 21 patients studied as part of ACTG study #149 (36), 20% had a history of AIDS prior to HD, consisting of Mycobacterium avium-intracellulare in two, Pneumocystis carinii pneumonia in two, and Kaposi's sarcoma in one. An additional 50% had symptomatic HIV-related disease prior to the diagnosis of HD, consisting of oral candidiasis, herpes zoster, and/or immune thrombocytopenic purpura. Of interest, although the majority of patients have not had full-blown AIDS prior to HD, many have had a history of reactive lymphadenopathy (persistent, generalized lymphadenopathy), which was reported in 36%-83% of individuals (30,33,35). In de novo HD in the United States and Europe, the majority of patients are diagnosed with nodular sclerosis disease, described in 52%-62% of large series (37). Lymphocyte-predominant disease accounts for 8%-21%, while mixed cellularity HD is seen in 24% and lymphocyte depletion subtype in 3%-6% of patients (37). In contrast, the most common type of HD in underdeveloped areas of the world (type 1 pattern) is mixed cellularity, while lymphocyte depletion is the next most frequently diagnosed pathologic subtype of disease (8-10). Similar to the pathologic spectrum in type 1 areas, patients with HIV-related HD tend to present with either mixed cellularity or lymphocyte depletion HD, diagnosed in 41%-100% of patients (29,32,34,38-41). Serrano et al. (40) compared the pathologic characteristics in 22 patients with HIV-related HD with those in 125 uninfected control subjects with HD diagnosed in the same time period, in the same institution in Spain. Mixed cellularity or lymphocyte depletion HD was diagnosed in 68% of the HIV-infected group, versus 35% of the uninfected control subjects. Of interest, when nodular sclerosis was diagnosed in the setting of HIV, it did not occur within the mediastinum, in contrast to HIV-negative patients with nodular sclerosis, in whom mediastinal involvement was documented in 74%. Systemic B Symptoms In general, fever, drenching night sweats, and/or weight loss occur more often in patients with HIV-related HD than in patients with de novo disease. Thus, in a large series from the United States or Europe, the prevalence of systemic B symptoms ranged from 30% (42) to 62%, the latter described in U.S. patients from minority racial/ethnic backgrounds and lower socioeconomic status (11). In contrast, between 70% and 100% of patients with HIV-related HD have presented with B symptoms (29,30,32,34,38-41). In the series of HIV-positive versus HIVnegative cases of HD from Spain, Serrano et al. (40) noted B symptoms in 81% of 22 HIVinfected patients and in 57% of 125 HIV-negative patients. While thus apparent that fever, night sweats, and/or weight loss may be commonly encountered in the setting of HIV-related HD, it is important to recognize that these symptoms may also be seen in Mycobacterium avium-intracellulare, cytomegalovirus disease, and other opportunistic infections. Thus, the assignation of such symptoms to HD must be made only after a careful evaluation has excluded the presence of underlying occult infection. Clinical Stage of HIV-Related HD at Presentation In de novo HD in the United States or Europe, stage III disease is diagnosed in approximately 27%, while stage IV is documented in 16%-26% (37). In contrast, widely disseminated HD is expected in the majority of patients with HIV-related HD. Thus, in the study of HIV-positive versus HIV-negative HD in Spain, Serrano et al. (40) noted stage III or IV disease in 91% of HIV-infected patients, versus only 46% of those with de novo HD. In a similar comparative study from France, Andrieu et al. (30) reported stage III or IV disease in 75% of 45 HIV-infected patients and in 33% of 407 HIV-negative individuals. These data would indicate that HD associated with HIV is clearly distinct in terms of the expectation of widely disseminated disease at initial presentation. This is very similar to the expectation in AIDS-related lymphoma, which is distinct from de novo lymphomatous disease (1). The most common site of extranodal HD in HIV-infected patients is the bone marrow, which is involved in approximately 41%-50% of all reported patients (32,34,39,40,43). Of interest, bone marrow involvement may be the first presentation of HIV-related HD, with patients seeking medical attention because of systemic B symptoms and/or signs or symptoms of pancytopenia. The primary diagnosis of HD within bone marrow may be difficult, revealing lymphohistiocytic aggregates and large atypical mononuclear cells that are suggestive but not diagnostic of HD (44). The rather common occurrence of HD within the bone marrow of HIV-infected individuals is in sharp contrast to de novo HD, in which Colby et al. (45) described such involvement in only 3.5% of 659 patients. While bone marrow involvement is distinctly unusual in de novo HD in the United States, when one considers only those patients with mixed cellularity or lymphocyte depletion HD, the prevalence of bone marrow involvement is much higher, at 20%-30%, as reported by O'Carrol et al. (46). Even when one considers only mixed cellularity and lymphocyte depletion disease, however, bone marrow involvement by HD is still more likely in the setting of HIV infection. Thus, Serrano et al. (40) described bone marrow involvement by HD in 50% of HIV-positive patients from Spain and in only 10% of 125 HIV-negative patients who were diagnosed and evaluated in the same institution. Aside from bone marrow, other sites of extranodal HD have included rectum (34,47), tongue (34), and skin (43,49). Involvement of the brain by HD is extremely unusual in de novo disease, but it has been described in the setting of HIV (49) in an injection drug user who presented with a seizure and was found to have a 3-cm, partially enhancing lesion in the left parietal lobe. Spinal fluid was negative, and the diagnosis of mixed cellularity HD was made after stereotaxic brain biopsy. More usual sites of extranodal HD have been described in patients with HIV-related disease, but even in this circumstance, the disease is distinct from that expected. Thus, HD in the lung has been described in the absence of mediastinal lymphadenopathy (43,50). Furthermore, hepatic HD has been diagnosed in the absence of splenic involvement (43). The majority of all patients with de novo HD experience long-term disease-free survival, with probable cure of disease expected in approximately 70%. When one considers results of radiotherapy for localized stage I or II disease, complete remission is expected in 80%-95%, with 80% of responders in continuous complete remission at 7 years (51). In patients with stage III or IV disease, ABVD chemotherapy (i.e., chemotherapy with doxorubicin, bleomycin, vinblastine, and dacarbazine) is associated with complete remission in 70%-80% of patients, with relapsefree survival in approximately 60%-70% of responders (52). Results of Retrospective Therapeutic Trials for HIV-Related HD Prognosis in patients with HIV-related HD is distinctly poorer than that expected in patients with de novo disease. Thus, median survival has been in the range of only 8-18 months (30,32,34,35,40,41,53). In the series of HIV-positive versus HIV-negative HD patients reported from Spain (40), 5-year survival was achieved in 80% of 125 HIV-negative patients and in none of 22 HIV-infected patients. The potential causes of decreased survival in HIV-related HD patients could include early demise as a result of other AIDS-related disorders, decreased efficacy of standard therapy, and/or increased toxicity of treatment. Of interest, while no large prospective series of uniformly treated patients has yet been published, preliminary data would suggest that the results of multiagent chemotherapy may be somewhat less optimal than expected in de novo disease. Thus, the comparative study by Serrano et al. (40) documented a complete remission in 54% of HIVinfected patients with HD, versus an 84% complete remission rate in those with de novo disease. As depicted in Table 1, complete remission rates have ranged from 44% to 100% in patients with HIV-related HD after being treated with a variety of regimens (32,35,38,40,54,55). Prospective Treatment Trials When one considers prospective therapeutic trials, Errante et al. (53) treated 17 patients with epirubicin, vinblastine, and bleomycin. Patients with poor prognostic disease (Eastern Cooperative Oncology Group performance status 3 or a history of opportunistic infection) received 50% of planned epirubicin and vinblastine dosing. In addition, these patients received zidovudine at the initiation of chemotherapy, while the others received full-dose chemotherapy with zidovudine initiated only after cycle 3. In patients with good prognosis disease, a complete remission rate of 67% was achieved, while complete remission was achieved in only one (20%) of five patients with poor prognosis HIV-related HD. Overall median survival in the 17 patients was 11 months. Tirelli et al. (56) used a similar regimen in 29 patients with HIV-related HD; they employed epirubicin (70 mg/m2), bleomycin (10 mg/m2), and vinblastine (6 mg/m2) given intravenously on day 1, with prednisone (40 mg/m2) given orally on days 1 through 5. Cycles were given every 21 days. Zidovudine (500 mg/day) was given to all patients who had not taken this drug before, while didanosine was given to the other patients. Granulocyte colony-stimulating factor was given at 5 µg/kg per day subcutaneously from day 6 to day 20 in all cycles. The median CD4 cell count at study entry was 219/mm3 (range, 6-812/mm3). Stage III or IV disease was present in 80% of the patients, while 90% had systemic B symptoms. Pathologic evaluation revealed either mixed cellularity or lymphocyte depletion HD in 69% of the patients. The complete remission rate was 69%, with 58% of these patients (i.e., 40% of all patients showing complete remission) remaining disease free at 2 years. Relapse of HD was documented in 30% of patients who had shown complete remission. Opportunistic infections occurred in 28% during therapy. Grade 3 or 4 leukopenia was documented in 34%. Median survival for the group was 14 months. HD was the cause of death in 50% of these patients; HD and opportunistic infection were the causes of death in an additional 5%. Levine et al. (36) have recently reported results from the AIDS Clinical Trials Group, employing standard-dose doxorubicin, bleomycin, vinblastine, and dacarbazine (52) in patients with newly diagnosed HIV-related HD. Cycles were repeated every 28 days, and therapy was continued until two cycles beyond complete remission, until six cycles had been given, or until toxicity or progressive disease. Granulocyte colony-stimulating factor was given subcutaneously at a dose of 5 µg/kg per day from days 2 through 14 and days 16 through 28 of each cycle. Antiretroviral agents were withheld during the first two cycles and then initiated with subsequent therapy. Doses of doxorubicin and vinblastine were reduced 75% in the presence of initial bone marrow involvement. A total of 21 patients were accrued, of whom 16 are currently assessable for response. The median age of the patients was 34 years, and 75% were male. The majority (91%) had no history of injection drug use. Median CD4 cell count at study entry was 128/mm3 (range, 2-972/mm3), and 20% had a history of AIDS prior to the diagnosis of HD. Systemic B symptoms were present in 86%. Stage IV HD was detected in 62%, while 14% had stage III disease. Sites of extranodal disease included bone marrow in 25%, while kidney, liver, brain, spinal cord, lung, and muscle involvement was also documented. A median of six cycles of ABVD chemotherapy was given (1-8). Complete remission was attained in 56% of the patients, and an additional 25% attained a partial response. Toxicity was significant, with grade 4 neutropenia in 48%, despite the use of granulocyte colony-stimulating factor. Hepatic toxicity was also observed; it was detected in 52% of the patients and consisted of grade 4 transaminasemia in four of 21. Other toxic effects were rather mild. The median survival for the group is 19.5 months, and eight patients have now died, as a result of opportunistic infection in three, liver failure due to reactivation of hepatitis B in one, sepsis in one, bacterial pneumonia in one, and HD in two. It is apparent from these studies that complete remission may be achieved in the majority of patients with HIV-related HD. 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