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Introduction
The risk for a severe coronavirus disease 2019 (COVID-19) with need for an intensive care unit (ICU) admission in a non-immunocompromised vaccinated population dropped from 5% at the beginning of the pandemic to at least 0.2% and is still decreasing since the omicron strain dominates the COVID-19 pandemic [1]. Beyond the risk factors identified for a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection like male sex, older age, and comorbidities such as cardiovascular disease, lung disease or obesity, patients with a history of malignancy, specifically patients with haematological malignancy, are prone to develop a complicated SARS-CoV-2 infection with need for ICU which is still associated with poorer clinical outcome [2,3,4,5,6,7,8,9,10,11,12,13,14,15]. The circumstances of a widely heterogenous population with regards to the type of haematological malignancy, extent of disease, haematological malignancy treatment history, [16,17,18] and baseline performance status are even more challenging in the environment of an ICU [19]. Although, data referring to critically ill COVID-19 patients regarding treatment strategies and outcome are widely available, data referring to critically ill patients with haematological malignancy are scarce and underreported [20].
The aim of this study is to analyze the epidemiology, risk factors and outcome of patients with haematological malignancy with need for an ICU setting using the data from the large-scale EPICOVIDEHA registry of the European Hematology Association—Scientific Working Group Infectious in Hematology (EHA-SWG) [21].
Methods
Study design, patients, and procedures
From January 1st, 2021, until March 10th, 2022, participating institutions documented retrospectively episodes of COVID-19 in their patients with haematological malignancy. Our analysis comprised data from the EPICOVIDEHA registry [21]. EPICOVIDEHA (www.clinicaltrials.gov; National Clinical Trials identifier NCT04733729) is an international open web-based registry for patients with haematological malignancy infected with SARS-CoV-2. EPICOVIDEHA was approved by the local ethics committee of the Fondazione Policlinico Universitario Agostino Gemelli—IRCCS, Università Cattolica del Sacro Cuore of Rome, Italy (Study ID: 3226). When applicable, the respective local ethics committee of each participating institution have approved the project. EPICOVIDEHA methods have been described elsewhere [21]. The electronic case report form (eCRF) is accessible online at www.clinicalsurveys.net (EFS Summer 2021, TIVIAN, Cologne, Germany). Each documented patient was reviewed and validated by infectious diseases and haematology experts from the coordination team. Inclusion criteria were (a) active malignancies within the last 5 years before COVID-19 diagnosis, or day 0, (b) patients ≥ 18 years old, (c) laboratory-based diagnosis of SARS-CoV-2 infection, and (d) last vaccine dose 15 or more days before PCR confirmed SARS-CoV-2 infection. Data on baseline conditions pre-COVID-19 (i.e., age, sex, status of haematological malignancy at COVID-19 diagnosis, defined as active [onset and refractory/resistant], stable disease or controlled [complete and partial response] based on the reports from the respective participating institution, factors predisposing for COVID-19), clinical management of the haematological malignancy (i.e., last treatment strategy), vaccine type, spike protein concentration at diagnosis of COVID-19, COVID-19 diagnosis and management (i.e., reason for diagnostic test, symptoms at onset, hospital stay/admission during infection, if needed, treatments received for infection) and outcome (i.e., mortality, attributable cause of death, mortality [assessed by the medical team in charge of the patient], last day of follow-up) were collected.
Study objectives
This study aimed to achieve several key objectives related to patients with haematological malignancies and COVID-19 who required ICU admission. Firstly, we wanted to comprehensive describe the sample of patients registered in EPICOVIDEHA who needed ICU care. Secondly, we intended to conduct a thorough analysis to identify factors associated with ICU admission, seeking to uncover potential predictors that could contribute to patients being eventually admitted to an ICU unit. Thirdly, we ambitioned to compare mortality rates between patients admitted to the ICU and those managed outside the ICU, offering valuable insights into the outcomes of these distinct patient groups. Lastly, we endeavoured to perform an in-depth analysis of the factors associated with mortality after ICU admission, shedding light on the determinants of survival for patients facing this critical phase of their illness.
Sample size and statistical analysis
No a priori sample size calculation was performed for this analysis. Categorical variables are presented with frequencies and percentages, and continuous variables with median, interquartile range (IQR) and absolute range. Proportion comparisons were performed using Fisher's exact or Pearson's chi (X) squared tests, respectively.
Logistic regression was utilized to determine which independent variables were associated with subsequent ICU admission. Additionally, Cox regression was used to analyze which factor could be associated with mortality 365 days after COVID-19 diagnosis in ICU patients who had data on duration of follow-up. Variables with a p-value < 0.1 in the univariable models were considered for the respective multivariable model. Clinical significance of the respective variable was also considered, based on previously reported literature, before transfer to multivariable analysis. A log-rank test was used to compare the survival probability of the patients admitted in the ICU based adjusted by anti-SARS-CoV-2 vaccination prior to COVID-19 diagnosis, which was graphically represented with a Kaplan–Meier survival plot. Patients with missing data in essential fields (i.e., haematological malignancies, chemotherapeutic program, vaccination status, COVID-19 management, or survival status) were considered as not valid and then, excluded from the final analysis. Among the valid cases, if a value in a specific variable was missing or unknown, it is indicated as such in the descriptive analysis. Patients with missing data in a certain variable were excluded from regression analyses in case that variable was included into such analyses.
A p-value ≤ 0.05 was considered statistically significant. SPSSv25.0 was employed for statistical analyses (SPSS, IBM Corp., Chicago, IL, United States).
Results
Cohort characteristics
A total of 94 centres in 26 countries, mainly from Europe, participated and registered 6934 cases. The clinical characteristics of these evaluable cases are reported in Table 1. Lymphoid malignancies were the largest subgroup, accounting 2414 cases (34.8%); the most frequently reported diagnosis was non-Hodgkin lymphoma (NHL, 2137 cases, 30.8%). Among myeloid malignancies, the most frequent diagnosis was acute myeloid leukaemia (AML, 828 cases, 11.9%). At the time of COVID-19 diagnosis, most patients had a controlled haematological malignancy (n = 3257, 47%), or a stable disease (n = 1305, 18.8%) and the remaining 31% (n = 2151 cases) an active disease. The most frequently reported last haematological malignancy treatment within the last 3 months was immuno-chemotherapy (n = 4367, 63.0%), and 241 patients with haematological malignancy (3.5%) had received HSCT within 6 months before COVID-19 diagnosis (allogeneic: 145; autologous: 96) and 28 had chimeric antigen receptor T cells (CAR-T) therapy (see Table 1).
Need for ICU
A total of 3705 (53.5%) patients with haematological malignancy developed severe COVID-19 involving need for hospitalization. Out of these, 1080 patients with haematological malignancy (29.2%, 15.6% from the whole cohort) developed a critical infection, and thus needed for ICU care. Invasive mechanical ventilation was needed in 421 (39%), while 533 (49.4%) received non-invasive ventilation support. The median duration of ICU stay was 10 days (IQR 5–19; range 1–115). The overall hospital stay was significantly longer (p < 0.001) in the ICU group as compared to the non-ICU group (22 vs. 12 days; (IQR 12–37, range 1–235 vs. IQR 7–21, range 1–200, p = 0.001).
Factors associated with critical COVID-19 infection
General factors and co-morbidities
groupMale sex was associated with critical infection (p = 0.033, OR 1.176, 95% CI 1.013–1.365). Most patients with haematological malignancy presented at least one comorbidity (n = 4243, 61.2% of the total cohort). This proportion was significantly higher in the ICU group as compared to the non-ICU group (67.1% vs. 60.1%, p < 0.001). Chronic cardiopathy (n = 385; 35.6%), chronic pulmonary disease (n = 194; 18%) and diabetes (n = 193; 17.9%) were the leading comorbidities in the ICU group. Also pulmonary in combination with extrapulmonary symptoms at COVID-19 onset (p = 0.023, OR 1.216, 95% CI 1.028–1.440) or extrapulmonary syndromes alone at COVID-19 onset (p < 0.001, OR 0.464, 95% CI 0.367–0.586) were associated with critically illness and need for intensive care. A complete list of comorbidities and the results of the univariate and multivariate analysis are available in Table 1, 2 and 3.
Viral subtypes
Omicron strain reduced the risk as compared to the other viral subtypes (p < 0.001, OR 0.291, 95% CI 0.187–0.454) for the need of ICU care in patients with haematological malignancy, which can also be seen in the proportion of critical COVID-19 infections (see Fig. 1).
Underlying hematological malignancy
In univariable and multivariable analyses, active malignancy (p < 0.001, OR 1.354, 95% CI 1.150–1.593) was associated with critically illness and need for intensive care (see also Table 1, 2, 3).
Vaccination
Unvaccinated patients with haematological malignancy were found more often in the ICU group (80.9% versus 68%; p < 0.001) and patients with haematological malignancy and at least two vaccine doses were significantly (p = 0.005, OR 0.693, 95% CI 0.535–0.898), three (p < 0.001, OR 0.607, 95% CI 0.456–0.807) or four vaccines (p = 0.026, OR 0.198, 95% CI 0.047–0.827) were less often transferred to the ICU.
ICU and outcome: exploratory analysis
Mortality rate
With 62.8% (n = 678) the mortality rate was significantly higher (p < 0.001) in the ICU group as compared to the non-ICU group (18.6%, n = 1086) (see Fig. 2, Supplementary Fig. S1).
Mortality rate associated risk factors
Using univariable and multivariable analyses we found active haematological malignancy (p < 0.001, HR 1.593, 95% CI 1.329–1.908), age (p = 0.010, HR 1.008, 95% CI 1.002–1.015) and comorbidities such as diabetes (p = 0.003, HR 1.366, 95% CI 1.114–1.675), liver disease (p < 0.001, HR 1.782, 95% CI 1.282–2.476); obesity (p = 0.020, HR 0.718, 95% CI 0.543–0.949) and renal impairment (p = 0.021, HR 1.354, 95% CI 1.048–1.750) as factors that increased ICU mortality. The influence of the SARS-CoV-2 subtypes and the effect on the mortality rate through the pandemic are presented in Fig. 1.
Factors associated with mortality rate reduction
COVID-19 treatment with antivirals, monoclonal antibodies, and corticosteroids (p = 0.012, HR 0.422, 95% CI 0.214–0.830) was associated with significantly reduced mortality rates in critically ill patients with haematological malignancy.
Discussion
In COVID-19 patients with haematological malignancy studies on need for intensive care and outcomes are scarce. We identified factors associated with admission into intensive care units in 6934 such high-risk patients with haematological malignancy, and investigated variables associated with mortality in these ICU patients. Mortality was significantly higher in patients with haematological malignancy and intensive care. In addition, mortality was driven by comorbidities. Interestingly, the omicron variants of concern (VOC) were associated with no progression to critical COVID-19. Vaccination was the main factor to reduce the likelihood of severe COVID 19 and need for ICU.
High rates of severe illness and mortality have been recorded in this patient population [4, 7, 22]. Throughout the pandemic the risk to develop severe COVID-19 requiring intensive care was more than three times higher (16% versus 5%) in patients with haematological malignancies [7, 23,24,25]. The risk varied with the dominant VOC, with intensive care risk rates reaching 21.8% during the “second wave” among immunosuppressed patients. Although, the likelihood of developing severe COVID-19 requiring intensive care decreased from 5 to 0.1–0.2% in the immunocompetent population, patients with haematological malignancy still faced substantially higher intensive care admission rates (8.4%) [26, 27].
The COVID-19-associated average global mortality rate in a general population was 1.1% with a wide range between different countries [27]. Within critically ill patients with a variety of underlying conditions, ICU mortality reached 32.7%, which exceeded up to 73% in ventilated patients with need for renal replacement, then declined to 25% during the pandemic [28, 29]. This contrasts with mortality rates in our study of 25.4% in the entire population of patients with haematological malignancy and even 62.8% in the intensive care group with higher rates in patients facing active disease with mortality rates up to approximately 83.8%. With the emergence of the omicron variants, an overall milder clinical course and lower mortality rates (5.7% in patients with wild type virus, 0.86% in patients with omicron variants) in all patients were observed. This trend was also detected in the ICU mortality (10% of patients with omicron variants died vs. 32.7% of patients with wild type died) [26, 28, 30,31,32]. Although, the risk of critical infections decreased in immunocompetent patients, our study reports mortality rates in critically ill patients with haematological malignancy remained elevated, with 48.4% and 66.1% in patients with active haematological malignancy during the omicron wave.
The mortality decrease over subsequent COVID-19 waves may be attributed to advances in patient care ranging from vaccination to introduction of targeted COVID-19 treatments [33,34,35]. New insights into the SARS-CoV-2 virus resulted in variety of potential therapeutic options [35, 36]. Although, COVID-19 therapy was not explicitly investigated in our cohort, the early initiation of corticosteroids so as the introduction of tocilizumab and antibodies in the management of severe COVID-19, may have potentially improved the outcome of these patients. The justified fear of further immunodepression using targeted therapeutic approaches lessened over time that early initiation of such therapies may also be beneficial in patients with haematological malignancy [9, 34].
Comorbidities and active haematological malignancy were confirmed in the present study as negative prognostic factors that had not changed since the pre-vaccination era [7, 37]. Apart from the known risk factors for severe COVID-19 such as pre-existing lung disease, obesity or cardiopathy, the extent of immunodeficiency and iatrogenic immunosuppression may also have impacted overall prognosis [9, 27, 38]. Outcomes may differ depending on the underlying haematological malignancy, its activity, and its therapy [8, 10,11,12,13, 15, 39]. The most plausible variables that may impact outcome in our patients include hypogammaglobulinemia, qualitative and quantitative B- and T-cell deficiencies, CD4 + lymphopenia, innate immune dysfunction, and neutropenia, all resulting from haematological malignancy itself and respective treatment [9, 27, 38]. Notwithstanding these potential implications, the recently published recommendations from European Conference of Infections in Leukaemia (ECIL-9) underlined the crucial role of mRNA-based vaccines against COVID-19 and recommended their use in patients with haematological malignancy [23,24,25, 38, 40, 41]. According to our findings, immunisation may have contributed significantly to reduce the need for intensive care and mortality in patients with haematological malignancy. It is clear that more research into the impact of additional vaccine booster doses and prophylactic monoclonal antibody administration in patients with an ineffective response to vaccination is desirable, especially in patients with severe or critical COVID-19 [23,24,25, 36].
Despite our findings, we plead for ICU treatment of patients with hematological malignancy patients which is sometimes discussed with some reluctance between intensivists and hemato-oncologists. Not only in COVID-19-affected patients but also in hematological malignancy patients without COVID-19 the outcome of these patients if ICU is needed increased during the last years [42, 43].
Some limitations of our study are the retrospective observational design and the possible selection bias owing to the large number of participating institutions. Moreover, our results did not focus on therapeutic strategies while patients were on ICU, as these were not possible to retrieve. Further prospective studies may evaluate the role of intensive care therapies in patients with haematological malignancies. Additionally, the study's limitations include the absence of data regarding co-infections, pulmonary embolism, shock, and other management within the ICU, as well as the inability to incorporate information about the timing and reason of ICU admission after positive COVID-19 PCR and symptom onset. Besides, no data regarding organ support or failure beyond ventilation or complications were obtained, and information on the admission policy for severe patients within the ICU and COVID-19-related treatment limitations was also not accessible. In the latter case associated mainly to lack of treatment strategies at pandemic onset. Furthermore, despite the online survey within EPICOVIDEHA prompts patient contributors to furnish serological levels post-vaccination (and pre-COVID-19), the actual performance and timing of such tests depend on the internal policies of individual hospitals and healthcare agencies. Consequently, this information may be unavailable in many cases, and even when available, it can be often in a limited number of cases and not always before the COVID-19 diagnosis. Given these constraints and to ensure the meaningfulness of our findings, we opted not to include this information in our patient data.
The study reveals that the risk of severe COVID-19 requiring ICU admission has notably declined in vaccinated, non-immunocompromised population, especially with the emergence of the omicron variant. However, patients with haematological malignancies, particularly those with active disease, continue to face a heightened risk of severe COVID-19 and ICU admission. Factors like male sex, comorbidities, and specific COVID-19 symptoms increase the likelihood of ICU admission in these patients, while vaccination significantly reduces this risk. Mortality rates in ICU-managed patients with haematological malignancies remain substantially higher than those outside the ICU, influenced by factors like active malignancy, age, and comorbidities. The study underscores the importance of ongoing research, vaccination, and appropriate treatments to enhance outcomes for this high-risk patient group.
Availability of data and materials
The data utilized in this study are accessible upon reasonable request to the corresponding author.
Change history
21 May 2024
A Correction to this paper has been published: https://doi.org/10.1007/s15010-024-02240-x
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Acknowledgements
The EPICOVIDEHA registry:
Joseph Meletiadis, Florian Reizine, Jan Novák, Summiya Nizamuddin, Roberta Di Blasi, Alexandra Serris, Pavel Jindra, Sylvain Lamure, François Danion, Maria Chiara Tisi, Mario Virgilio Papa, Nurettin Erben, ľuboš DrgoňA, Nathan C. Bahr, Murtadha Al-Khabori, Ayten Shirinova, Jörg Schubert, Lisset Lorenzo De La Peña, José-Ángel Hernández-Rivas, Elena Busch, Josip Batinić, Giuseppe Sapienza, Mohammad Reza Salehi, Reham Abdelaziz Khedr, Nina Khanna, Baerbel Hoell-Neugebauer, Ana Groh, Eleni Gavriilaki, Rita Fazzi, Rémy Duléry, Roberta Della Pepa, Mario Delia, Nicola Coppola, Maria Calbacho, Darko Antić, Hossein Zarrinfer, Ayel Yahia, Vivien Wai-Man, Ana Torres-TIenza, Alina Daniela Tanasa, Andrés Soto-Silva, Laura Serrano, Enrico Schalk, Ikhwan Rinaldi, Gaëtan Plantefeve, Monica Piedimonte, Maria Enza Mitra, Carolina Miranda-Castillo, Jorge Loureiro-Amigo, Ira Lacej, Martin Kolditz, María-Josefa Jiménez-Lorenzo, Guillemette Fouquet, Omar-Francisco Coronel-Ayala, Mathias Brehon, Panagiotis Tsirigotis, Anastasia Antoniadou, Gina Varricchio, Maria Vehreschild, Agostino Tafuri, José-María Ribera-Santa Susana, Joyce Marques De Almeida, María Fernández-Galán, Avinash Aujayeb, Athanasios Tragiannidis, Malgorzata Mikulska, Sein Win, Elizabeth De Kort, Hans-Beier Ommen, Donald C. Vinh, Hans Martin Orth, Sandra Malak, Przemyslaw Zdziarski, Modar Saleh, Chi Shan Kho, Fabio Guolo, M. Mansour Ceesay, Christopher H. Heath, Sergey Gerasymchuk, Monica Fung, Maximilian Desole, Erik De Cabo, Tania Cushion, Fazle Rabbi Chowdhury, Louis Yi Ann Chai, Fevzi Altuntaş, Charlotte Flasshove.
Funding
Open Access funding enabled and organized by Projekt DEAL. EPICOVIDEHA has received funds from Optics COMMIT (COVID-19 Unmet Medical Needs and Associated Research Extension) COVID-19 RFP program by GILEAD Science, United States (Project 2020-8223).
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TL and JSG conceived of the presented idea. JSG developed the theory and performed the computations. TL and JSG verified the analytical methods. All authors discussed the results and contributed to the final manuscript. TL and JSG wrote the manuscript with input from all authors. All authors provided patient data and reviewed the manuscript.
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Reasonable requests for data sharing may be submitted to Livio Pagano (livio.pagano@unicatt.it).
Ethical approval
EPICOVIDEHA was approved by the local ethics committee of the Fondazione Policlinico Universitario Agostino Gemelli—IRCCS, Università Cattolica del Sacro Cuore of Rome, Italy (Study ID: 3226). When applicable, the respective local ethics committee of each participating institution have approved the project.
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The original online version of this article was revised: Collaborating authors have been added.
Members of “EPICOVIDEHA registry” are listed in Acknowledgements section.
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Lahmer, T., Salmanton-García, J., Marchesi, F. et al. Need for ICU and outcome of critically ill patients with COVID-19 and haematological malignancies: results from the EPICOVIDEHA survey. Infection 52, 1125–1141 (2024). https://doi.org/10.1007/s15010-023-02169-7
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DOI: https://doi.org/10.1007/s15010-023-02169-7