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Clinical characteristics and outcomes of Mycobacterium tuberculosis disease in adult patients with hematological malignancies

BMC Infectious Diseases volume 11, Article number: 324 (2011) Cite this article

Abstract

Background

Diseases caused by Mycobacterium tuberculosis (TB) among adult patients with hematological malignancies have rarely been investigated.

Methods

Adult patients with hematological malignancies at National Taiwan University Hospital between 1996 and 2009 were retrospectively reviewed. Patients with positive serology for HIV were excluded. TB disease is diagnosed by positive culture(s) in the presence of compatible symptoms and signs. The demographics, laboratory and, microbiological features, were analyzed in the context of clinical outcomes.

Results

Fifty-three of 2984 patients (1.78%) were diagnosed with TB disease. The estimated incidence was 120 per 100,000 adult patients with hematological malignancies. Patients with acute myeloid leukemia had a significantly higher incidence of TB disease than other subtypes of hematological malignancies (2.87% vs. 1.21%, p = 0.002, odds ratio, 2.40; 95% confidence interval, 1.39-4.41). Thirty-eight patients (72%) with non-disseminated pulmonary TB disease presented typically with mediastinal lymphadenopathy (53%), pleural effusion (47%) and fibrocalcific lesions (43%) on chest imaging. The 15 (28%) patients with extra-pulmonary disease had lower rates of defervescence within 72 h of empirical antimicrobial therapy (13% vs 45%, p = 0.03) and a higher 30-day in-hospital mortality (20% vs. 0%, p = 0.004) compared to those with disease confined to the lungs.

Conclusions

TB disease is not uncommon among patients with hematological malignancies in Taiwan. Patients who received a diagnosis of extra-pulmonary TB suffered higher mortality than those with pulmonary TB alone. Clinicians should consider TB in the differential diagnoses of prolonged fever in patients with hematological malignancies, particularly in regions of high endemicity.

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Background

Although progress continues to be made with novel target therapy, chemotherapy remains the standard treatment in most patients with hematological malignancies. Side effects of chemotherapy include nausea, vomiting, mucositis, neutropenia and impaired humoral and cellular immunity. Febrile neutropenia is a common complication after chemotherapy; and infection is the leading cause of morbidity and mortality among patients with hematological malignancies. Bacteria and fungi are the major etiological agents of chemotherapy induced febrile neutropenia in patients with hematological malignancies [1, 2]. Mycobacterium tuberculosis (TB) is a slow growing microbe that can cause disease in both healthy and immunocompromised persons. Yet TB disease in hematological patients has been rarely investigated [3–5].

The clinical manifestations of TB disease differ between cancer and non-cancer patients [3–5]. Cancer patients infected with TB frequently manifest more atypical clinical symptoms and signs [6, 7]. The lung is still the most commonly involved site among cancer patients. However, extra-pulmonary tuberculosis appears not to be uncommon [5]. The incidence and mortality of TB disease are reportedly higher for cancer patients compared to otherwise healthy patients [6, 7]. Ku et al. [8] and Cordonnier et al. [9] had previously studied TB disease in hematopoietic stem cell recipients. Since hematopoietic stem cell recipients usually receive intensive immunosuppressant regimens, they are at heightened risk of acquiring opportunistic infections. The diagnosis of TB disease is often difficult and delayed in hematopoietic stem cell recipients [8, 9]. Delays in diagnosis of TB disease foreseeably could lead to fatal outcomes in patients with acute leukemia [10].

Taiwan is an endemic area for TB disease with an increasing trend of incidence over the past 40 years [11]. To define the role of TB disease in patients with hematological malignancies, we should improve the diagnostic accuracy and direct therapeutic strategy in late stages of febrile neutropenia in patients residing in regions of endemicity. In our previous epidemiological study, up to 60% of bloodstream isolates in febrile neutropenia consisted of gram negative pathogens and the leading gram negative pathogens were Escherichia coli, Klebsiella pneumonia, Acinetobacter baumannii, Stenotrophomonas maltophilia, and Pseudomonas aeruginosa [12]. How to differentiate between competing diagnoses of disease due to TB or aerobic bacteria (such as Enterobacteriaceae) in hematological patients with febrile neutropenia is elemental in clinical practice. In this study, we retrospectively reviewed hematological patients with TB disease in a single university hospital in Taiwan to investigate the clinical characteristics and outcomes of TB disease in hematological patients with febrile neutropenia.

Methods

Patients and hospital setting

National Taiwan University Hospital (NTUH) is a 2600-bed teaching hospital in northern Taiwan that provides both primary and tertiary care. Lymphoma, acute myeloid leukemia and multiple myeloma were the most common diagnosis of hematological malignancies [1, 12]. All adult (age ≧ 18 years) hematological patients enrolled in this retrospective study were patients admitted between January 1996 and December 2009. Patients with hematological malignancies who were HIV-positive were excluded. Demographic features, hematological disease status, underlying medical diseases, laboratory and microbiological data, and outcomes were collected and analyzed retrospectively. The incidence of TB disease in patients with various hematological malignancies was calculated. This research conformed to the Helsinki Declaration and local legislation, and was approved by the local ethics committee.

Definition and diagnosis of M. tuberculosis

Definite diagnosis of M. tuberculosis disease was made based on clinical symptoms and signs and positive culture(s) for M. tuberculosis from sputum and/or tissue. To prevent inclusion of non-tuberculosis mycobacterial cases, patients with clinical suspicion of M. tuberculosis infections but without documented culture results were excluded from this study. Pathological findings of caseous necrosis, Langerhan giant cell and acid-fast stain positive were in themselves insufficient as criteria for inclusion. Synchronous infection was defined as a diagnosis of TB disease within 3 months of hematological disease diagnosis [5, 13]. Readings of plain chest radiographs for all patients at admission and diagnosis of TB infection were reviewed by radiologists.

Statistical analysis

Categorical variables were compared using the chi-squared test. Continuous variables were compared using the Student's t-test or ANOVA test. The significance level was set at 0.05 and all p values were two-tailed. The survival stratified by pulmonary and extra-pulmonary tuberculous was analyzed by Kaplan-Meier method and log-rank test. All statistical analyses were performed using SPSS 18.0 for Windows (SPSS, Chicago, IL, USA).

Results

Epidemiology of M. tuberculosis disease

Between 1996 and 2009, a total of 2984 patients were admitted to NTUH with hematological malignancies, including 1011 patients diagnosed with acute myeloid leukemia (AML), 276 patients with acute lymphoblastic leukemia (ALL), 956 patients with lymphoma, 307 patients with multiple myeloma (MM), 169 patients with chronic myeloid leukemia (CML) or lymphoid leukemia (CLL), and 265 patients with myelodysplastic syndrome (MDS) or severe aplastic anemia (SAA). Of these, 53 patients (37 males and 16 females) with a median age of 58 years (range, 27-86 years) were diagnosed with TB disease. The overall incidence of TB disease in patients with hematological malignancies during the study period was 1.78%. The numbers of TB cases among each subtype of hematological malignancies were in descending order as follows: AML, n = 29 (2.87%); ALL, n = 5 (1.81%); lymphoma, n = 8 (0.84%); MM, n = 5 (1.63%); CML/CLL, n = 1 (0.59%); and MDS/SAA, n = 5 (1.89%) (Figure 1). Patients with AML were more likely to develop TB disease than patients with other hematological malignancies (2.87% vs. 1.12%, p = 0.002; odds ratio, 2.40; 95% confidence interval, 1.39-4.41).

Figure 1
figure 1

Percentage of tuberculosis in patients with hematological malignancy between 1996 and 2009.

Full size image

Clinical and laboratory characteristics of patients with M. tuberculosis disease

The clinical manifestations and laboratory results of 53 patients with TB disease are shown in Table 1. Twenty-six (49%) patients were diagnosed with TB disease at the time of febrile neutropenia, while 27 (51%) patients were diagnosed (including 5 patients without fever at diagnosis) with a non-neutropenic status. Patients diagnosed during febrile neutropenia were more likely to be patients with AML as opposed to other hematological subtypes (19 of 29 patients, 66% vs. 7 of 24 patients, 29%, p = 0.013) and were synchronously diagnosed with TB disease and hematological malignancies (54% vs. 11%, p = 0.001) more frequently than non-neutropenic counterparts.

Table 1 Clinical and laboratory manifestations of 53 haematological patients with Mycobacterium tuberculosis (TB) infection
Full size table

Sputum acid-fast stains and cultures were performed in all 53 patients (median 3 sets, ranged 1-14). Of the 43 patients diagnosed with pulmonary tuberculosis, nine patients (21%) had smear-positive TB (both positive for acid-fast bacilli (AFB) in sputum smear and culture positive for TB); the remaining 34 patients were smear-negative. Fifteen of the 53 patients (28%) had extra-pulmonary disease, with positive cultures from lymph nodes (n = 4), liver aspirates (n = 3), synovial fluid (n = 2), ascites (n = 2), urine (n = 2), abdominal wall abscess (n = 1), and blood (n = 1). Five of the 15 patients (33.3%) with extra-pulmonary tuberculosis (lymph nodes, 2; liver aspirate, 1; urine, 1; and blood, 1) also had concomitant pulmonary involvement. The characteristics of pulmonary only versus extra-pulmonary disease were similar in terms of absolute neutrophil count (2174 per uL vs. 1100 per uL, p = 0.76) and hematological malignancies subtypes (AML subtype: 31% vs. non-AML subtype: 25%, p = 0.87). The median duration of fever in patients with extra-pulmonary tuberculosis was longer than those with disease confined to the lungs (15 days vs 9 days, p = 0.025). In addition, patients with extra-pulmonary TB had a higher 30-day mortality (p = 0.004, Figure 2) and were less likely to defervesce within 72 h after commencement of broad-spectrum antibiotic therapy (13% vs 45%, p = 0.03). (Table 1) There were no other significant predictive features to distinguish isolated pulmonary from extra-pulmonary TB disease.

Figure 2
figure 2

30-day mortality between pulmonary and extra-pulmonary tuberculosis ( p = 0.004).

Full size image

Drug resistance of M. tuberculosis and treatment outcomes

Nine of the 53 different TB isolates (17.0%) from each patient showed drug-resistance, including one isolate (1.9%) resistant to both isoniazid and rifampin (multi-drug resistant TB). The drug resistance percentages were as stated for isoniazid (n = 5, 9.4%), streptomycin (n = 4, 7.5%), rifampin (n = 1, 1.9%) and ethambutol (n = 1, 1.9%).

Forty-eight (91%) patients received anti-tuberculosis treatment during hospitalization; 39 (81%) patients received standard anti-tuberculosis treatment (isoniazide, rifampin, ethambutol, and pyrazinamide) and 9 (19%) patients received fluoroquinolone based anti-tuberculosis therapy. Patients with extra-pulmonary tuberculosis had a higher rate of fluoroquinolone-based therapy (38% vs. 11%, p = 0.048). No differences in the timing of anti-tuberculous therapy initiation in relation to the date of culture were observed between patients with neutropenia and those without (median interval, 20 days vs. 22 days, p = 0.52), nor between patients with only pulmonary disease versus extra-pulmonary disease (median interval, 22 days vs. 22 days, p = 0.31).

Radiological characteristics of pulmonary tuberculosis

The radiological characteristics of 43 patients with pulmonary tuberculosis are shown in Table 2. The chest plain films at admission and at diagnosis of pulmonary tuberculosis were evaluated. Twenty-nine (67%) patients had chest computer tomographic images at diagnosis of pulmonary tuberculosis. Typical findings in descending order were mediastinal lymphadenopathy in 23 (53%) patients, pleural effusions in 20 patients (47%) and fibrocalcific parenchymal lesions in 16 patients (43%). Computer tomography (CT) significantly detected more mediastinal lymphadenopathy (p < 0.001) compared to plain chest radiography.

Table 2 Radiological characteristics of 43 patients with pulmonary tuberculosis
Full size table

Discussion

The increased utilization of anti-neoplastic agents in the treatment of hematological malignancies is associated with an increase of endemic opportunistic infections, for example, tuberculosis. Neutropenia, impaired humoral and cellular immunity are frequent complications in patients with hematological malignancies. The symptoms and signs of TB disease in patients with hematological malignancies may thus differ from the general population [3, 5, 14, 15]. However, the epidemiology, clinical manifestations, and outcomes are mostly undetermined. In Taiwan, estimates of the incidence of TB disease ranged from 75 per 100,000 population to 62 per 100,000 population between 2002 and 2008 [16]. In this study, we estimated the incidence of TB disease to be approximately 120 per 100,000 for patients with hematological malignancies; namely an increase by two-fold above the general population. Similarly, Libshitz et al. had reported the incidence of TB disease to be 90 per 100,000 in cancer patients, a rate nine times greater than the general population in the United States [13]. These results show that TB disease is not uncommon among patients with hematological malignancies, especially in a tuberculosis endemic area.

The timing of tuberculosis reactivation or development in patients with hematological malignancies is not clear. Since 43% patients had fibrocalcified lesions on the chest CT, we infer that most patients might have had previous TB infection before febrile neutropenia. Reactivation of tuberculosis in patients with hematological malignancies could result from impaired immunity by underlying hematological malignancies and/or chemotherapy induced immunosuppression. The definite timing of patients developed active tuberculosis disease needs further prospective investigation.

Stefan et al. reported that acute lymphoblastic leukemia was the most common malignancy in children with tuberculosis [14]. Steroid and lymphoid malignancy both impair cellular immunity and potentially increase the risk of tuberculosis disease. However, Mishra et al. reported that patients with AML rather than lymphoma had a higher rate of M. tuberculosis disease [15]. Our results support the observation that adult AML patients might have a relatively higher rate of TB disease than other types of hematologic malignancies. Since neutrophil counts were unknown in previous studies [14, 15], we discovered that tuberculosis in AML patients is often associated with significant febrile neutropenia compared to non-AML patients (66% vs. 29%, p = 0.013). The risk of acquiring TB disease may correlate partly with the patient's absolute neutrophil counts, but this association may not be uniform across different types of hematological malignancies. Recent research on human neutrophil peptides has highlighted their bactericidal action against TB and suggested that neutrophils may play a more important defensive role in tuberculosis [17]. Neutrophil could mediate innate immunity against mycobacterium. In an adult tuberculosis cohort, risk of TB disease was inversely and independently associated with peripheral blood neutrophil counts in patients diagnosed with pulmonary tuberculosis [18]. This result was consistent with our study supporting the important role of neutrophils in the defense against TB infection. TB disease might be evaluated as an important differential diagnosis for patients with hematological malignancies suffering from febrile neutropenia in a tuberculosis endemic area.

Extra-pulmonary presentation of TB disease is common in patients with hematological malignancies, ranging from 16% to 78% for all kinds of TB disease [5, 13, 19]. We observed that 28% of hematological patients with TB disease had extra-pulmonary manifestations, in line with prior studies [5, 13, 19]. In this study, we found that patients with extrapulmonary tuberculosis had prolonged fever associated with worse outcomes. Cytokines play a role in host defence of tuberculosis [20]. However, previous study revealed cytokine levels did not correlate with localization of pulmonary and extrapulmonary tuberculosis [20]. It might be possible that extrapulmonary TB represented disseminated disease and delayed diagnosis due to variable extrapulmonary manifestations in the patients with hematological malignancies contributed to excess mortality [21–23]. Extra-pulmonary tuberculosis often presented with various symptoms and signs, such as hepatosplenic tuberculosis, which may also mimic chronic disseminated candidiasis [24, 25]. Diagnostic procedures in hematological patients are impeded by bleeding tendencies and neutropenic status, thus the diagnosis of extra-pulmonary tuberculosis could be delayed because of a lack of tissue proof and cultures. Thus, in hematological patients with prolonged fever without definite etiology, tuberculosis might be one of the differential diagnoses in the clinical practice of hemato-oncology.

Pulmonary infiltration is a frequent presentation of infectious diseases in cancer patients [13]. Although nonspecific pneumonia is one of the radiographic findings of pulmonary tuberculosis, it is not helpful for diagnosis. In this study, most patients with hematological malignancies and pulmonary tuberculosis showed mediastinal lymphadenopathy, pleural effusions, and fibrocalcified lesions. From this, reactivation of tuberculosis after immunocompromised status by hematological malignancies and/or chemotherapy associated neutropenia is highly suspected. Andreu et al. [26] reported that lymphadenopathy is the most characteristic radiological feature in tuberculosis. In enhanced chest CT, hilar and mediastinal nodes with a central hypodense area supported the diagnosis [26]. However, only one patient had the typical presentation of mediastinal lymph node with central hypodense lesion. This characteristic image finding is not sensitive enough to predict pulmonary tuberculosis. Chest CT scan revealed mediastinal lymphadenopathy in half of the patients with pulmonary tuberculosis, which could be a better predictor of culture positive tuberculosis. Computer tomography was significantly better at discovering mediastinal lymphadenopathy (p < 0.001) than plain chest radiography. Hence chest CT might be a more valuable tool for diagnosing pulmonary TB in hematological patients with clinical respiratory symptoms/signs after chemotherapy,

Severe neutropenia produces relatively less tissue inflammatory response after chemotherapy in hematological patients [27]. The atypical clinical presentations of TB disease in hematological patients makes a difficult diagnosis in the context of coexistent disease even more difficult [28]. By this token, we suggest that TB should always be considered even as a remote possibility so that unusual symptoms and signs are elicited, followed by at least three sputum examinations. A plain chest film to screen for tuberculosis in cancer patients with febrile neutropenia is recommended by Taiwanese guidelines [29]. However, for those patients without a definite diagnosis from chest plain films and ongoing pulmonary symptoms, we suggest chest tomography to be an appropriate modality for clinical diagnosis of TB disease in regions of high endemicity.

Critically ill tuberculosis patients may have symptoms of acute respiratory distress syndrome, disseminated intravascular coagulopathy, or infrequently septic shock [30, 31]. The search for causative pathogens in febrile neutropenia is still a challenge in current clinical practices. According to this study, clinicians should remain alert to the differential diagnosis of tuberculosis in hematological patients with prolonged fever of unknown etiology.

This study had the following limitations. First, only hematological patients with proven tuberculosis were enrolled, and some patients with low mycobacterium burden might be excluded. Second, tissues biopsy and cultures were not available for all hematological patients because of bleeding tendency and neutropenic status. Third, this study was a retrospective cohort; some limitations such as concurrent infection in patients with febrile neutropenia cannot be completely excluded. Further large scale study should be conducted to confirm the findings based on our limited case numbers.

Conclusions

In conclusion, infections caused by M. tuberculosis are not uncommon among patients with hematological malignancies in countries with a high incidence of tuberculosis. Tuberculosis causes significant morbidity and mortality in patients with various hematological malignancies and in recipients of hematopoietic stem cell transplants. Patients with extra-pulmonary tuberculosis had significantly higher 30-day mortality than those with pulmonary disease alone. Clinicians may choose to evaluate tuberculosis as a differential diagnosis for prolonged fever in patients with hematological malignancies in endemic areas.

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Acknowledgements

This study was supported in part by grant 100-S1526 Department of Medical Research in National Taiwan University Hospital, Taiwan. We thank the staff of the Eighth Core Lab, Department of Medical Research, National Taiwan University Hospital for technical support during the study.

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Authors and Affiliations

  1. Department of Internal Medicine, Division of Hematology, National Taiwan University Hospital, Taipei, Taiwan

    Chien-Yuan Chen, Woei Tsay, Shang-Yi Huang, Jih-Luh Tang & Hwei-Fang Tien

  2. Department of Internal Medicine, Division of Infectious disease, National Taiwan University Hospital, Taipei, Taiwan

    Wang-Huei Sheng, Aristine Cheng, Yee-Chun Chen & Shan-Chwen Chang

  3. Department of Internal Medicine, Division of Chest, National Taiwan University Hospital, Taipei, Taiwan

    Jaun-Yuan Wang

  4. Department of Internal Medicine, National Taiwan University Hospital, No. 7, Chung-Shan South Road, Taipei, 100, Taiwan

    Wang-Huei Sheng

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Authors' contributions

CYC, WHS, and AC designed, conducted the study and wrote manuscript. YCC, WT, JLT, SYH, JYW, SCC, HFT recruit patients and provide patients care. All authors read and approved the final manuscript.

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Chen, CY., Sheng, WH., Cheng, A. et al. Clinical characteristics and outcomes of Mycobacterium tuberculosis disease in adult patients with hematological malignancies. BMC Infect Dis 11, 324 (2011). https://doi.org/10.1186/1471-2334-11-324

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