https://orcid.org/0000-0002-2807-3565
Figures
Abstract
Background
Patients with hepatocellular carcinoma (HCC) represent a vulnerable population potentially negatively affected by COVID-19-associated reallocation of healthcare resources. Here, we report the impact of COVID-19 on the management of HCC patients in a large tertiary care hospital.
Methods
We retrospectively analyzed clinical data of HCC patients who presented at the Vienna General Hospital, between 01/DEC/2019 and 30/JUN/2020. We compared patient care before (period 1) and after (period 2) implementation of COVID-19-associated healthcare restrictions on 16/MAR/2020.
Results
Of 126 patients, majority was male (n = 104, 83%) with a mean age of 66±11 years. Half of patients (n = 57, 45%) had impaired liver function (Child-Pugh stage B/C) and 91 (72%) had intermediate-advanced stage HCC (BCLC B-D). New treatment, was initiated in 68 (54%) patients. Number of new HCC diagnoses did not differ between the two periods (n = 14 vs. 14). While personal visits were reduced, an increase in teleconsultation was observed (period 2). Number of patients with visit delays (n = 31 (30%) vs. n = 10 (10%); p = 0.001) and imaging delays (n = 25 (25%) vs. n = 7 (7%); p = 0.001) was higher in period 2. Accordingly, a reduced number of patients was discussed in interdisciplinary tumor boards (lowest number in April (n = 24), compared to a median number of 57 patients during period 1). Median number of elective/non-elective admissions was not different between the periods. One patient contracted COVID-19 with lethal outcome.
Citation: Pomej K, Scheiner B, Hartl L, Balcar L, Meischl T, Mandorfer M, et al. (2021) COVID-19 pandemic: Impact on the management of patients with hepatocellular carcinoma at a tertiary care hospital. PLoS ONE 16(8): e0256544. https://doi.org/10.1371/journal.pone.0256544
Editor: Peter Starkel, Cliniques Universitaires Saint-Luc, BELGIUM
Received: February 22, 2021; Accepted: August 10, 2021; Published: August 26, 2021
Copyright: © 2021 Pomej et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Data Availability: All relevant data are within the manuscript and its Supporting Information files.
Funding: This study was supported by a grant of the scientific funds of the mayor of the City of Vienna (BGMWF-485569-2020) awarded to TR.
Competing interests: K.P. has nothing to declare; B.S. received travel support from Gilead, Ipsen and AbbVie; L.H. has nothing to declare; L.B. has nothing to declare; T.M. has nothing to declare; M.M. served as a speaker and/or consultant and/or advisory board member for AbbVie, Bristol-Myers Squibb, Collective Acumen, Gilead, and W. L. Gore & Associates and received travel support from AbbVie, Bristol-Myers Squibb, and Gilead; T.R. received travel support from Gilead, Roche, MSD, and Gore; grant support from Gilead, Abbvie, Philips, Boehringer Ingelheim, Phenex Pharmaceuticals, and Gore, and served as a consultant for MSD, Gilead, Abbvie, and Boehringer Ingelheim; C.M. has nothing to declare; M.T. received grant support from Albireo, Cymabay, Falk, Gilead, Intercept, MSD, and Takeda, honoraria for consulting from BiomX, Boehringer Ingelheim, Falk, Genfit, Gilead, Intercept, Janssen, MSD, Novartis, Phenex, Regulus and Shire, speaker fees from BMS, Falk, Gilead, Intercept and MSD, as well as travel support from Abbvie, Falk, Gilead and Intercept; M.P. is an investigator for Bayer, BMS, Lilly, and Roche; he received speaker honoraria from Bayer, BMS, Eisai, Lilly, and MSD; he is a consultant for Bayer, BMS, Ipsen, Eisai, Lilly, MSD, and Roche; he received travel support from Bayer and BMS. This does not alter our adherence to PLOS ONE policies on sharing data and materials.
List of abbreviations: AFP, α-fetoprotein; BCLC, Barcelona clinic liver cancer; CI, confidence interval; COVID-19, coronavirus disease 19; CPS, Child-Pugh score; CRP, C-reactive protein; CT, computed tomography; EASL, European Association for the Study of the Liver; ECOG-PS, Eastern Cooperative Oncology Group performance status; HBV, hepatitis B virus; HCC, hepatocellular carcinoma; HCV, hepatitis C virus; ICU, intensive care unit; MRI, magnetic resonance imaging; MWA, microwave ablation; OS, overall survival; PCR, polymerase chain reaction; RFA, radiofrequency ablation; SARS-CoV-2, severe acute respiratory syndrome coronavirus 2; TACE, transarterial chemoembolization; VAS, visual analogue scale; WHO, world health organization
Introduction
Since December 2019, when the first cases of coronavirus disease 19 (COVID-19) were identified in Wuhan, China, severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2), a novel enveloped RNA betacoronavirus, rapidly spread across the globe, imposing numerous challenges on countries’ health systems and economies [1, 2]. After the world health organization (WHO) declared COVID-19 as a pandemic in early March 2020 [3], national health authorities and local governments, including Austria, were forced to implement various hygienic and physical distancing measures in order to stop the virus from spreading. Austria declared a total lockdown beginning from March 16, 2020, leading to the reallocation of resources especially in the healthcare sector. As of January 12, 2021, there have been 89 million confirmed cases of COVID-19 leading to 1.93 million deaths worldwide [4].
COVID-19-associated healthcare restrictions challenged the treatment of patients with chronic diseases and malignancies, including patients with HCC. HCC is among the top ten causes of cancer-related deaths in Austria with an age-adjusted mortality rate of around 4–5 per 100,000, and accounted for 4.5% of all cancer-related deaths in 2017 [5–8]. Patients with cancer are a high-risk group in the COVID-19 pandemic. Generally, they are more susceptible to any kind of infection due to an immunodeficient state caused by the underlying malignancy and anti-cancer treatments, such as systemic therapies and radiotherapy. Furthermore, as they require close follow-up, they are recalled to the hospitals more often, which further increases their risk of contracting SARS-CoV-2 infection [9]. While at the beginning of the pandemic, evidence from small retrospective studies suggested that cancer patients receiving anti-cancer treatments had an increased risk of mortality from COVID-19 than patients without anti-cancer therapies [9–11], this hypothesis was later on rejected, as mortality from COVID-19 seemed to be primarily determined by age, sex, comorbidities (e.g.: arterial hypertension, cardiovascular disease, diabetes mellitus), and ECOG PS in patients with active cancer [12–14]. Moreover, the risk of admission to intensive care unit (ICU) or the need for mechanical ventilation has been shown to be 3.5-fold higher in cancer patients [10, 15].
According to the recommendations of the European Association for the Study of the Liver (EASL) published during the COVID-19 crisis, management of patients with HCC should be maintained according to guidelines, including the administration of systemic treatments, the evaluation for liver transplantation, and the discussion of patients in multidisciplinary tumor boards [16]. Cancer surveillance for high-risk patients should be continued if possible, in order to minimize the risk of a future increase in cancer-related mortality [16].
The aim of this study was to evaluate the impact of the COVID-19 outbreak and accompanying governmental restrictions and reallocation of healthcare resources on the management of patients with HCC at Austria’s largest tertiary care hospital.
Materials and methods
Study design
We retrospectively included in- and outpatients with HCC who presented at the Vienna General Hospital/Medical University of Vienna between December 1, 2019 and June 30, 2020. Patients who were registered with the ICD diagnosis code “C22.0” were identified from the hospital’s electronic patient documentation system.
The observation time was divided in two periods, using March 16, 2020 as cut-off date, as it represents the day of the start of the hard lockdown in Austria. Period 1 (December 1, 2019 –March 15, 2020) represents the time before COVID-19 measures were implemented (Fig 1) and period 2 (March 16, 2020 –June 30, 2020) represents the time of COVID-19-associated governmental and healthcare restrictions.
Measures implemented by A) the Austrian government and B) the Vienna General Hospital, Medical University of Vienna, Department of Internal Medicine, Division of Gastroenterology and Hepatology.
In order to explore patients’ satisfaction and worries with the quality of care during COVID-19-related healthcare restrictions, we distributed a written questionnaire comprising 11 questions to patients with liver diseases in the Hepatology in- and outpatient service of the Medical University of Vienna starting in June 2020. All patients visiting the in- and outpatient clinic were asked to participate in the survey on a voluntary basis. In order to determine patient satisfaction with the quality of care at our department, a visual analogue scale (VAS), ranging from 0–10 points, was used.
Retrospective data analysis was approved by the local ethics committee of the Medical University of Vienna (#1690/2020 and #1461/2020) and performed according to the current version of the Helsinki Declaration (2013). Written informed consent was obtained from all patients completing the questionnaire.
Patients and definitions
Eligible patients were adults (>18 years) diagnosed with HCC. Diagnosis of HCC was established either by histology or dynamic imaging (computed tomography [CT]/magnetic resonance imaging [MRI] scans) according to the European Association for the Study of the Liver (EASL) guidelines [7]. Patients with other liver tumors (e.g., cholangiocellular carcinoma), hepatic metastasis due to other primary malignancies, and one patient with insufficient records were excluded from this study. Patient data were collected from original patient records, including outpatient, discharge, and tumor board letters as well as radiological reports. Laboratory parameters were collected from laboratory reports from a network of hospitals in Vienna.
Evaluation of patient visits, interventions, and imaging
All information on planned and performed visits, interventions, and imaging have been retrospectively collected from the clinical documentation system. ‘Visits’ were defined as outpatient and inpatient appointments as well as elective admissions to the ward of the Division of Gastroenterology & Hepatology. ‘Interventions’ included liver/tumor biopsy, hepatic surgery, microwave ablation [MWA], radiofrequency ablation [RFA], transarterial chemoembolization [TACE] and gastroscopy, liver related surgery, and liver biopsy. The term ‘imaging’ included routine imaging tests (e.g.: CT and MRI) for tumor response evaluation.
Statistics
Statistical analyses of all data, including data from the questionnaire, were performed using IBM SPSS Statistics 26 (SPSS Inc., Armonk, New York, USA). Continuous variables were reported as mean ± standard deviation (SD) or median (IQR), and categorical variables were shown as numbers (n) and proportions (%) of patients. Comparisons of proportions and of continuous variables were performed by Chi-squared test and unpaired Student’s t test, respectively. For paired samples McNemar’s test and paired Student’s t test were applied. Kaplan-Meier method was used to calculate the median time of delays and survival curves. A two-sided p-value ≤0.05 was considered statistically significant.
A ‘delay’ was defined as difference ≥14 days between the planned and the actual date of visit/intervention/imaging. The difference of 14 days has been chosen, in order to incorporate the variation of appointments that can be expected in clinical routine due to statistical reasons. In order to compare the number of delays between the two periods, delays were assigned to period 1 and period 2 according to the date of planned visit/intervention/imaging, irrespective of possible cross-overs. Only patients who have presented to our clinic in both periods, were considered for the comparison (n = 102). For calculation of the duration of a delay, the date of planned visit/intervention/imaging was subtracted from the actual date of visit/intervention/imaging minus 14. Kaplan-Meier method was used to calculate the duration of delays. Patients who never showed up for the planned visit/intervention/imaging were censored at the last day of the observation period (March 15, 2020 for period 1 and June 30, 2020 for period 2). In patients with more than one delay in either visit, intervention, or imaging, we calculated the median time of delay in each individual patient, which was then used to calculate the median time of delay for the whole cohort of patients with a respective delay.
Results
Patient characteristics
In total, 148 patients with suspected HCC presented at the Vienna General Hospital/Medical University of Vienna between December 1, 2019 and June 30, 2020. Of those, 22 patients were excluded from this study due to other liver tumors (n = 21) and inadequate documentation (n = 1) (Fig 2). Consequently, 126 patients were included in this study, of whom 24 patients were not considered for the comparison of the two periods due to missing follow-up in period 2 (n = 15) and no visit during period 1 (n = 9). Detailed patient characteristics are shown in Table 1. The majority of patients was male (n = 104, 83%) with a mean age of 66±11 years. One-hundred and three (82%) patients had cirrhosis. Viral hepatitis (38%) and alcoholic liver disease (30%) were the main etiologies. Sixty-nine patients had Child-Pugh stage A (55%) and the most frequent tumor stage was BCLC stage C (n = 47; 37%). Thirty-eight (30%) patients received systemic therapy at study inclusion. Forty-two (33%) patients were under observation after successful tumor treatment (surgery, loco-ablative therapy) while 43 (34%) patients were treatment-naïve at study inclusion. A new treatment was initiated in 68 (54%) patients during the observation period. Median time of follow-up was 5.4 (95%CI: 4.9–5.8) months.
Prevalence of risk factors for COVID-19
Comorbidities (i.e., arterial hypertension, diabetes mellitus) have previously been established as risk factors for acquiring a severe COVID-19 infection and for mortality from COVID-19 [17, 18]. Chronic health conditions were frequently observed in our cohort (Table 1). The most common comorbidities apart from HCC were arterial hypertension (n = 72, 57%), followed by diabetes mellitus (n = 47, 37%), a history of smoking (n = 41, 33%), chronic kidney disease (n = 21, 17%), and chronic obstructive pulmonary disease (COPD) (n = 14, 11%).
Impact of COVID-19-associated measures on diagnostic and therapeutic procedures
Of 126 patients included, 28 patients were newly diagnosed with HCC during the observation period. There was no difference in newly diagnosed HCC cases between period 1 (n = 14) and period 2 (n = 14). Baseline characteristics between patients diagnosed in period 1 and period 2 were not different (S1 Table).
In the subgroup of patients who had at least one hospital contact during both periods (n = 102), there was no significant difference in mean number of visits (in- and outpatient) between period 1 and period 2 (2.6±1.5 vs. 2.3±1.5; p = 0.157) (Table 2). In total, 40 (39%) patients had a delay in follow-up visits. Thirty-one (30%) patients had a visit delay in period 2 compared to only 10 (10%) patients in period 1 (p = 0.001). The median duration of visit delay was also numerically longer in period 2 (32 (95%CI: 7–58) days in period 2 vs. 21 (95%CI: 0–43) days in period 1). Interventions were performed in forty-seven (46%) patients of whom 5 (11%) patients had an intervention delay (3 gastroscopies and 2 microwave ablations) in period 2 compared to 0 intervention delays in period 1 (p = 0.063). The median time of intervention delay in period 2 was 22 days. Moreover, the number of patients with imaging delays was significantly higher in period 2 (period 1: n = 7 (7%) vs. period 2: n = 25 (25%); p = 0.001). The median duration of imaging delay was also longer in period 2 (34 (95%CI: 1–67) days in period 2 vs. 25 (95%CI: 0–61) days in period 1).
Impact of COVID-19-associated measures on patient contacts
There was a shift from personal visits towards telephone visits in the outpatient clinic starting with March 16, 2020 due to a policy change (Fig 3). While the median patient contact per month for personal visits was 62 patients during the first three months in period 1 (December-February), only a median of 22 patients were seen personally during the last three months of period 2 (April-June). Instead, we observed an increase in teleconsultation which peaked in April with a total of 38 patients (Fig 3). The median number of elective and non-elective admissions to the wards was 28 per month over the entire observational period (December 2019-June 2020), and not different between period 1 and period 2 (median, n = 23 and n = 24) (Fig 3). Finally, the number of patients discussed in the weekly interdisciplinary, hepatobiliary tumor board was lower during period 2, with the lowest number (24 patients) being discussed in April compared to a median number of 57 patients discussed per month during the first three months of period 1 (December-February) (Fig 4).
SARS-CoV-2 testing and positivity
In total, 80 (64%) patients were tested for SARS-CoV-2 routinely (e.g., before imaging) in line with local COVID-19 regulations and had a total number of 248 SARS-CoV-2 tests (Table 3). In patients (n = 80) who received at least one SARS-CoV-2 test, the median number of tests per patient was 2 (IQR: 1–4). Only one patient (1.3%) was tested positive for SARS-CoV-2 and consequently developed COVID-19 pneumonia within the observation period. Initially, the patient was admitted to our inpatient ward for radiofrequency ablation of two HCC nodules on March 12, 2020. After discharge on the following day, the patient presented with dyspnea, fever, and hypotension at a different hospital on March 20, 2020. His initial PCR test for SARS-CoV-2 was negative. He was admitted to the ICU due to respiratory failure and sepsis. When his condition worsened, the patient was transferred to our hospital one week later, where he was tested positive for SARS-CoV-2 upon admission. Apart from HCC in non-alcoholic steatohepatitis (NASH)-related cirrhosis, the patient had arterial hypertension and diabetes mellitus type II as risk factors for the development of severe COVID-19. The patient’s condition gradually worsened. He developed a three-organ failure (lung, kidney, and liver) and died on May 6, 2020.
Survival and follow-up of the whole cohort
Twenty-one of 126 patients (17%) died until June 30, 2020. Eight patients (38% of total deaths) died during period 1 and 13 patients (62% of total deaths) deceased during period 2. The majority of those patients (n = 20, 95%) died due to progression of the liver disease while one patient (5%) died from COVID-19.
Patient perceptions on HCC care during initial phase of COVID-19 pandemic
Twenty-two patients with HCC completed the specifically designed questionnaire on patient satisfaction during COVID-19-associated healthcare restrictions. Although there was an increase in the number of visit, intervention and imaging delays after the implementation of restrictions (period 2), patient satisfaction with HCC care remained high as indicated by a visual analogue scale (VAS, ranging from 0–10) value of 8.9±1.4 before vs. 9.3±1.0 during COVID-19 measures. Only one (4.5%) patient reported dissatisfaction about the liver care provided during the pandemic due to reduced possibilities of contacting his general practitioner. Fear about negative implications of the pandemic on the underlying liver disease was present in approximately one third of patients with HCC (n = 6, 27%). None of the patients reported having problems with access to their medication, including anti-cancer treatments.
Discussion
The first wave of the COVID-19 pandemic imposed significant challenges on healthcare systems and led to the reallocation of resources normally assigned to other diseases. The implementation of a state-wide hard lockdown in Austria involved numerous changes in standard clinical care activities for critically ill patients. In this study we provide real-world data on the implications on management of HCC patients during COVID-19-associated healthcare measures at a tertiary care hospital.
On 16th of March 2020, a nationwide lockdown was introduced due to rising numbers of COVID-19 positive cases in Austria, rapidly leading to the flattening of the curve of the infection rate with SARS-CoV-2 in the general population [19]. Cancer patients are more susceptible to infections due to their systemic immunosuppressive state and were therefore thought to be at increased risk for acquiring SARS-CoV-2 especially in the beginning of the pandemic [10]. Studies from China reported a SARS-CoV-2 incidence among cancer patients of around 1% [9, 10]. In an Austrian cohort of patients with different cancer types, the infection rate was 0.4% (4/1016 patients), which was comparable to that of the general Austrian population and even lower when compared to patients without cancer [20]. We observed a similar rate in our cohort of patients with HCC, as only one of 80 tested patients (1.3%) contracted SARS-CoV-2; however, this patient died from COVID-19 pneumonia and multiorgan failure.
Several studies [13, 21] have demonstrated that patients with cancer appear to have an increased risk of mortality due to SARS-CoV-2 infection, with mortality rates ranging between 11% [22] and 28% [14]. In addition to well-known risk factors including age, sex, and concomitant metabolic diseases (e.g., arterial hypertension, diabetes mellitus), ECOG PS ≥2 and active cancer seem to be associated with worse outcomes from COVID-19 [13, 17, 23]. In our cohort, frequently observed risk factors were arterial hypertension (57%), diabetes mellitus (37%) and a history of smoking (33%). Furthermore, the patient with fatal COVID-19 outcome was 46 years old, male, and had active cancer. Moreover he was obese (BMI ≥30kg/m2 according to the current WHO guidelines [24]) and had two metabolic risk factors (arterial hypertension and diabetes mellitus), ECOG PS 0 and recently received RFA for active HCC.
Patients with advanced HCC are a very vulnerable and complex population as they usually suffer from concomitant underlying liver disease [25]. Thus, they require close follow-up and evaluation of their tumor status and adequate management of the underlying liver disease, resulting in frequent hospital visits [7, 25]. Implementation of remote care (i.e., telemedicine/telehealth) during pandemics is beneficial in keeping people safe by reducing the use of resources in healthcare, improving access to care, and minimizing the risk of direct transmission from person to person. At the Division of Gastroenterology and Hepatology, Medical University of Vienna, personal visits were reduced to a minimum and follow-up visits were predominantly conducted via telephone for the first two months after lockdown (Fig 3). Another COVID-19-associated healthcare measure was the change to virtual meetings in order to reduce personal contacts and the spreading of SARS-CoV-2 between departments within the hospital. As a consequence, the weekly hepatobiliary tumor board has been held in virtual format since the middle of March. Even though numbers of patients discussed in the tumor board were lower in the first two months after lockdown, these numbers went almost back to normal by the end of May. In general, video consultations and telemental health services were among other telemedicine services that were introduced during the COVID-19 pandemic [26]. However, many countries lack regulatory frameworks to properly authorize, integrate, and reimburse telemedicine services, and physicians’ concerns about technical and clinical quality of care, safety and privacy often remain [27, 28]. Nevertheless, we believe that telemedicine could be used as an alternative way of communicating with cancer patients who have a stable disease and are not requiring monthly face-to-face consultations, including the possibility to send drug prescriptions and referrals for upcoming imaging examinations by mail. Similarly, virtual conferences have proven of value as they represent a potential tool of communication in the future due to time effectiveness and simplicity.
As the pandemic progressed, international organizations including the American Association for the Study of Liver Disease (AASLD) [29] and the European Association for the Study of the Liver (EASL) [7] published guidelines on the management of patients with HCC and only few studies shared their real-life experiences and reported on the modifications made in the management algorithms of patients with HCC. While Iavarone and colleagues [30] only reported an increase in treatment delays of 2 months or longer in a small cohort of 42 HCC patients, Amaddeo et al. [31] observed a significant decrease of new diagnoses and treatment initiations in HCC patients. Notably in our study, the number of newly diagnosed HCC cases was similar before and after lockdown, suggesting that patients with a suspected malignancy still had access to rapid diagnosis and treatment initiation despite implementation of considerable healthcare restrictions. However, we observed significant differences in the number of patients with a delay in scheduled follow-up visits or imaging between the two periods. These differences can be explained by personal factors such as hospital avoidance due to the fear of contracting SARS-CoV-2, as well as institutional factors including the delay of imaging appointments and a general delay due to the implementation of SARS-CoV-2 testing before radiological interventions and admissions. Even after reducing patient occupancy of ward rooms to meet the COVID-19 hospital hygiene regulations, elective and non-elective admissions of patients with HCC did not significantly decline.
In general, patient satisfaction with HCC care remained high, even after implementation of COVID-19-related measures, although fear of negative impacts on the underlying liver disease was present in nearly one third of patients. While some European countries reported a massive impact of the COVID-19 pandemic on gastroenterology and hepatology departments, with 40% of the beds being repurposed for COVID-19 patients [32], we were able to largely sustain care of HCC patients at Austria’s largest tertiary care hospital, possibly due to the comparatively low incidence of COVID-19 in Austria during the first wave of the pandemic. However, we do believe that the inevitable effect of COVID-19 on liver diseases, including HCC, will be indirect and delayed, and thus, it may not be visible yet [33, 34].
We have to acknowledge some limitations for this study. First, we might have missed information on visits, delays, and risk factors for SARS-CoV-2 infection due to the retrospective design of the study and a possible lack of documentation. However, we thoroughly screened all outpatient documentation, discharge letters, and imaging reports and are confident that we can report at least all data that led to medical contact. Moreover, due to the limited sample size/duration of follow-up, this study was not sufficiently powered to assess the impact of delays, lower rates of patient presentations in interdisciplinary boards, and the shift from personal to telephone visits on patient survival.
In summary, we provide real-world data on the impact of SARS-CoV-2 on the management of HCC patients during the first wave of the pandemic in a large European tertiary care hospital. The incidence of SARS-CoV-2 infections was comparable with that of the general population. We observed a higher number of patients with visit and imaging delays after lockdown as well as lower numbers of patients discussed in tumor boards, while numbers of elective and non-elective admissions remained stable. Even though patient satisfaction with HCC care at our institution remained high, the long-term implications of the COVID-19 pandemic on the outcome of patients with HCC remain to be determined.
Supporting information
S1 Table. Baseline characteristics between period 1 and period 2 in patients with newly diagnosed hepatocellular carcinoma.
https://doi.org/10.1371/journal.pone.0256544.s001
(DOCX)
References
- 1. Guan WJ, Ni ZY, Hu Y, Liang WH, Ou CQ, He JX, et al. Clinical Characteristics of Coronavirus Disease 2019 in China. N Engl J Med 2020;382:1708–1720. pmid:32109013
- 2. Wu Z, McGoogan JM. Characteristics of and Important Lessons From the Coronavirus Disease 2019 (COVID-19) Outbreak in China: Summary of a Report of 72 314 Cases From the Chinese Center for Disease Control and Prevention. Jama 2020;323:1239–1242. pmid:32091533
- 3.
Timeline: the WHO’s COVID-19 response. In. https://www.who.int/emergencies/diseases/novel-coronavirus-2019/interactive-timeline: World Health Organization; 2020.
- 4.
Numbers at a glance. In. https://www.who.int/emergencies/diseases/novel-coronavirus-2019: World Health Organization; 2020.
- 5.
Cancer Incidence Austria. In: Statistik Austria; 2021. p. Cancer Incidence Austria.
- 6. Pinter M, Hucke F, Zielonke N, Trauner M, Sieghart W, Peck-Radosavljevic M. Epidemiological trends of hepatocellular carcinoma in Austria. Dig Dis 2014;32:664–669. pmid:25376282
- 7. EASL Clinical Practice Guidelines: Management of hepatocellular carcinoma. J Hepatol 2018;69:182–236. pmid:29628281
- 8. Torre LA, Bray F, Siegel RL, Ferlay J, Lortet-Tieulent J, Jemal A. Global cancer statistics, 2012. CA Cancer J Clin 2015;65:87–108. pmid:25651787
- 9. Yu J, Ouyang W, Chua MLK, Xie C. SARS-CoV-2 Transmission in Patients With Cancer at a Tertiary Care Hospital in Wuhan, China. JAMA Oncol 2020;6:1108–1110. pmid:32211820
- 10. Liang W, Guan W, Chen R, Wang W, Li J, Xu K, et al. Cancer patients in SARS-CoV-2 infection: a nationwide analysis in China. Lancet Oncol 2020;21:335–337. pmid:32066541
- 11. Dai M, Liu D, Liu M, Zhou F, Li G, Chen Z, et al. Patients with Cancer Appear More Vulnerable to SARS-CoV-2: A Multicenter Study during the COVID-19 Outbreak. Cancer Discov 2020;10:783–791. pmid:32345594
- 12. Lee LYW, Cazier J-B, Angelis V, Arnold R, Bisht V, Campton NA, et al. COVID-19 mortality in patients with cancer on chemotherapy or other anticancer treatments: a prospective cohort study. The Lancet 2020;395:1919–1926.
- 13. Kuderer NM, Choueiri TK, Shah DP, Shyr Y, Rubinstein SM, Rivera DR, et al. Clinical impact of COVID-19 on patients with cancer (CCC19): a cohort study. The Lancet 2020;395:1907–1918. pmid:32473681
- 14. Mehta V, Goel S, Kabarriti R, Cole D, Goldfinger M, Acuna-Villaorduna A, et al. Case Fatality Rate of Cancer Patients with COVID-19 in a New York Hospital System. Cancer Discovery 2020;10:935–941. pmid:32357994
- 15. Gosain R, Abdou Y, Singh A, Rana N, Puzanov I, Ernstoff MS. COVID-19 and Cancer: a Comprehensive Review. Curr Oncol Rep 2020;22:53. pmid:32385672
- 16. Boettler T, Marjot T, Newsome PN, Mondelli MU, Maticic M, Cordero E, et al. Impact of COVID-19 on the care of patients with liver disease: EASL-ESCMID position paper after 6 months of the pandemic. JHEP Reports 2020;2. pmid:32835190
- 17.
Severe Outcomes Among Patients with Coronavirus Disease 2019 (COVID-19)—United States, February 12-March 16, 2020. MMWR Morb Mortal Wkly Rep 2020;69:343–346.
- 18. Richardson S, Hirsch JS, Narasimhan M, Crawford JM, McGinn T, Davidson KW, et al. Presenting Characteristics, Comorbidities, and Outcomes Among 5700 Patients Hospitalized With COVID-19 in the New York City Area. Jama 2020;323:2052–2059. pmid:32320003
- 19.
AGES COVID-19 Dashboard In. https://covid19-dashboard.ages.at/: Austrian Federal Office for Health and Food Safety; 2020.
- 20. Berghoff AS, Gansterer M, Bathke AC, Trutschnig W, Hungerländer P, Berger JM, et al. SARS-CoV-2 Testing in Patients With Cancer Treated at a Tertiary Care Hospital During the COVID-19 Pandemic. J Clin Oncol 2020;38:3547–3554. pmid:32795227
- 21. Tian J, Yuan X, Xiao J, Zhong Q, Yang C, Liu B, et al. Clinical characteristics and risk factors associated with COVID-19 disease severity in patients with cancer in Wuhan, China: a multicentre, retrospective, cohort study. The Lancet Oncology 2020;21:893–903. pmid:32479790
- 22. Miyashita H, Mikami T, Chopra N, Yamada T, Chernyavsky S, Rizk D, et al. Do patients with cancer have a poorer prognosis of COVID-19? An experience in New York City. Ann Oncol 2020;31:1088–1089. pmid:32330541
- 23. Kim D, Adeniji N, Latt N, Kumar S, Bloom PP, Aby ES, et al. Predictors of Outcomes of COVID-19 in Patients with Chronic Liver Disease: US Multi-center Study. Clin Gastroenterol Hepatol 2020. pmid:32950749
- 24. Tsigos C, Hainer V, Basdevant A, Finer N, Fried M, Mathus-Vliegen E, et al. Management of obesity in adults: European clinical practice guidelines. Obes Facts 2008;1:106–116. pmid:20054170
- 25. Pinter M, Trauner M, Peck-Radosavljevic M, Sieghart W. Cancer and liver cirrhosis: implications on prognosis and management. ESMO Open 2016;1:e000042. pmid:27843598
- 26. Telemedicine and the COVID-19 Pandemic, Lessons for the Future. Telemedicine and e-Health 2020;26:571–573. pmid:32275485
- 27. Hollander JE, Carr BG. Virtually Perfect? Telemedicine for Covid-19. New England Journal of Medicine 2020;382:1679–1681. pmid:32160451
- 28. Ohannessian R, Duong TA, Odone A. Global Telemedicine Implementation and Integration Within Health Systems to Fight the COVID-19 Pandemic: A Call to Action. JMIR Public Health Surveill 2020;6:e18810. pmid:32238336
- 29. Fix OK, Hameed B, Fontana RJ, Kwok RM, McGuire BM, Mulligan DC, et al. Clinical Best Practice Advice for Hepatology and Liver Transplant Providers During the COVID-19 Pandemic: AASLD Expert Panel Consensus Statement. Hepatology 2020;72:287–304. pmid:32298473
- 30. Iavarone M, Sangiovanni A, Carrafiello G, Rossi G, Lampertico P. Management of hepatocellular carcinoma in the time of COVID-19. Ann Oncol 2020;31:1084–1085. pmid:32330540
- 31. Amaddeo G, Brustia R, Allaire M, Lequoy M, Hollande C, Regnault H, et al. Impact of COVID-19 on the management of hepatocellular carcinoma in a high-prevalence area. JHEP Rep 2020:100199. pmid:33163949
- 32. Crespo J, Fernández Carrillo C, Iruzubieta P, Hernández-Conde M, Rasines L, Jorquera F, et al. MASSIVE IMPACT OF COVID-19 PANDEMIC ON GASTROENTEROLOGY AND HEPATOLOGY DEPARTMENTS AND DOCTORS IN SPAIN. J Gastroenterol Hepatol 2020. pmid:33184937
- 33. Pawlotsky JM. COVID-19 and the liver-related deaths to come. Nat Rev Gastroenterol Hepatol 2020;17:523–525. pmid:32528138
- 34. Horn L, Garassino M. COVID-19 in patients with cancer: managing a pandemic within a pandemic. Nature Reviews Clinical Oncology 2020.