To Do or Not to Do?—A Review of Cancer Surgery Triage Guidelines in COVID-19 Pandemic

Abstract

COVID-19 pandemic has emerged as a global health emergency involving more than 200 countries so far. The number of affected population is on rising, so is the mortality. This crisis has overwhelmed the healthcare infrastructures in many affected countries. Due to overall rising cancer incidence and specific concerns, a cohort of cancer patients forms a distinct subset of the population in whom a correct and timely treatment has a huge impact on the outcome. During this period, oncology care is definitely affected owing to many factors like lockdowns, reduced beds and deferral of elective cases to halt the spread of the pandemic. Surgery remains the best line of defence in many solid organ tumours especially in early stage and is potentially curative. China, the source of this pandemic, has taken more than 3 months to enter the post transitional phase of this pandemic. Deferring cancer surgeries for this long period may have a direct impact on the long-term outcomes of cancer patients. Many surgical oncology associations across the globe have come up with triage guidelines for surgical care of cancer patients; however, these are based on expert opinion rather than actual data. Herein, we intend to review these guidelines with respect to the risk of disease progression in cancer patients. In the absence of actual data on cancer surgery care during this pandemic, clinical decisions should be based on careful consideration of disease-related and patient-related factors. While some of the cancer surgeries can be safely delayed for some time, how long we can delay surgeries safely cannot be answered/ explained by any means. Thorough evaluation and discussion by an expert and experienced multidisciplinary team appears to be the most effective way forward.

Introduction

In the new decade, our world woke up to a new medical challenge: the SARS COVID-19 pandemic. As of March 31, 2020, this pandemic has affected 801,400 people and killed 38,743 people across the globe. The experience from China, the source of the outbreak, and other countries affected by the pandemic has shown the magnitude by which healthcare facilities can be overwhelmed during this crisis. Worldwide measures to ‘flatten the curve’ of this medical emergency have been implemented, so as to buy time for the national healthcare infrastructure and resources to gear up to deal with this catastrophic illness. Hospitals also face a challenge to cater the needs of their existing sick patients, particularly those with malignancies. With this pressure on healthcare facilities combined with other realities of increasing cancer incidence, the need for special resources in oncology care, guarded prognosis in many malignancies and semi-emergent nature and need of cancer treatment, it is extremely difficult for an oncology healthcare personnel to decide who gets treatment for cancer and who has to wait. While the oncologist makes this judgement, they welter between maintaining a balance between logical and philosophical decision making during this crisis. As cancer surgeries involve significant healthcare resources in terms of infrastructure, intensive care unit beds, blood products and manpower, surgical oncologists face a dilemma regarding the triage of surgical patients during this period of uncertainty. Guidelines, laid by professional organisations like the Society of Surgical Oncology (SSO), American Cancer Society (ACS), European Association of Urology (EAU), Indian Association of Surgical Oncology (IASO) and Federation of Head Neck Oncology (FHNO) are predominantly based on expert opinions and are vague at places. Herein, we intend to review triage guidelines for cancer surgery, laid down by these associations around the globe.

Lessons from the Past

COVID-19 is the sixth global public health emergency in the history as declared by WHO. The two epidemics in recent past, SARS-CoV (2002–2003) and the MERS-CoV (2012–2015), have given us insight into how closely these three manifest, albeit SARS COVID-19 has emerged to be more lethal than the other two [1]. These epidemics have taught us to initiate response interventions in the form of early detection, containment, control and mitigation [2]. Sadly, there is a dearth of literature from SARS and MERS epidemics on experience and implications in the field of cancer surgery.

The ‘Novel’ Virus

The novel coronavirus (SARS-CoV-2) has been documented to have an efficient human to human transmission process via airborne, droplet and contact routes. Unlike the SARS-CoV, patients of SARS-CoV-2 can transmit the infection during the incubation period as well [3]. The age group with the highest risk for acquiring primary and secondary cases of infection is 50–65 years (most cancers are found in the same age group). About 50% of patients have a subclinical infection, 30% have mild to moderate symptoms and 20% can develop severe symptoms with 5–10% requiring ICU care and ventilatory requirement. Symptoms common to most coronavirus infections are fever, chills, generalized myalgia, drowsiness, cough, shortness of breath, abdominal pain, nausea, vomiting and diarrhoea. The median duration of viral shedding is about 20 days and longest known to be 37 days, with continue shedding until death, unaltered by the administration of antiviral drugs such as Ritonavir and Lopinavir [4]. The median time of requirement of invasive mechanical ventilation reported is 14.5 days, and the median time to death being 18.5 days [4]. Sepsis, followed by respiratory failure, adult respiratory distress syndrome (ARDS), heart failure, acute kidney injury, shock and secondary infections (including ventilator-associated pneumonia) are the common complications with severe infections [4]. The virus can be isolated from oropharyngeal and respiratory secretions and also in stool samples of affected individuals. However, the virus has not been isolated in the blood or urine [5]. The World Health Organization (WHO) and Centre for Disease Control and Prevention (CDC) recommend RT-PCR for laboratory diagnosis of SAR-CoV-2 [6]. China, where the pandemic started, has now entered the post pandemic or the transitional phase, and clinical epidemiological data from China can prove to be a guiding light for the management of cases. So far social distancing, a modern form of quarantine, has proven to be the most effective preventive strategy for containment of this pandemic. Two drugs, remdesivir and hydroxychloroquine, have shown in vitro efficacy against SARS-CoV-2 [7, 8]. Further population studies with these drugs are awaited, and it will take another few months till we have a vaccine for SARS-CoV-2.

Oncology Patient Cohort—A Special Set of Population

According to the GLOBOCAN 2018, globally, there were 18.1 million new cancer cases and 9.6 million cancer deaths in 2018 with a speculated increasing trend in overall incidence [9]. Cancer patients are at heightened risk for infection owing to suppressed immunity due to the malignancy per se and secondary to the effect of chemotherapy, radiotherapy and surgery. Also, reports have shown an increased rate of complications, need for ventilatory support, admission to intensive care units, overall poor prognosis and death in cancer patients with COVID-19 infection. A particular concern for a cancer surgeon is to weigh the risk of deferring cancer surgery versus the risk of COVID-19 exposure and infection to patients as well as health care providers. Disruptions in outbreak mitigation strategies like social distancing and prudent utilization of limited health resources also need consideration in this regard [10, 11].

Cancer Surgery in COVID-19 Outbreak

Cancer surgeries utilise substantial resources in a hospital including diagnostic modalities, blood products, ICU beds and even ventilators. Hence, it is imperative to carefully decide the treatment plan for every patient by involving the multidisciplinary team, deciding which ones can safely be kept on the waiting list or started any bridging therapy until surgery. Existing COVID-19 cases, less volunteers for blood donation due to lockdown and rejection of donors due to history of exposure, symptoms and SARS-CoV-2 positivity can further dwindle the availability of the blood and blood products. Although there exists a theoretical risk of transmission of the virus in blood products, currently there is no data suggesting transmission of SARS CoV-2 by transfusion. However, the American Association of Blood Banks and European Center for Disease prevention and Control (ECDC) have suggested deferral of blood donation by patients with a history of probable exposure and travel (by 3 weeks) and COVID positive cases (by 4 weeks). However, routine screening of donors is not yet recommended [12, 13]. Published Chinese reports on the outcomes of cancer patients infected with COVID-19 indicated a 3.5 times higher risk of needing mechanical ventilation or ICU admission or dying compared with patients without cancer [10]. Thus altogether, subjecting a cancer patient to surgery has its own risks to the patient and burdening the hospital resources. However, delaying the cancer surgeries have other implications like an increased extent of surgery in the event of cancer progression, increased perioperative morbidity/mortality and also missing a chance of offering cure due to disease spread caused by waiting. These facts cannot be overseen, also, cancer is a bigger problem than COVID-19 from patient’s perspective. Table 1 summarises various studies addressing the impact of time to treatment initiation or delaying surgeries on cancer survival [14,15,16,17,18,19,20,21,22,23,24,25,26,27]. Keeping these concerns in mind, some guidelines have recommended a possible triage (Table 2) to offer surgeries, even during the course of an active pandemic, for certain precarious malignancies who are known to have rapid progression.

Table 1 Various studies addressing the impact of waiting time/TTI on cancer survival/prognosis
Table 2 Priority surgery recommendations based on different guidelines

Anaesthesia-Related Concerns

Surgical intervention on asymptomatic infected patients in standard operating theatres without negative pressure capability can have devastating consequences exposing operating room personnel including surgeons, anaesthetists and nursing staff to a significant risk and due precautionary measures are needed. The American Association of Anaesthetists has provided excellent guidelines to follow during this pandemic. Some of the important measures are attention to surface and equipment cleaning during and between cases, regular glove changing, regular handwashing, avoiding high flow devices especially if not using personal protective equipment (PPE), video laryngoscopy assisted intubation where possible and ensuring appropriate disinfection procedures. Airway manipulation puts the anaesthetist and all healthcare workers at exposure to aerosols from the patient. Aerosol generating procedures during administration of general anaesthesia include bag and mask ventilation, endotracheal intubation and open airway suctioning. It is preferable to use regional anaesthesia wherever feasible, with added advantage of less effect on pulmonary function as compared to general anaesthesia [31,32,33,34,35,36]. Considering the significant risk of COVID transmission related to anaesthesia, it is prudent to defer the non-emergent surgical interventions. However, cancer surgeries cannot truly be considered as non-emergent interventions as there is a real risk of disease progression during the waiting period.

Individual Organ System Considerations

Gastrointestinal and Hepatobiliary Cancers

The SARS-CoV-2 is shed in intestinal cells. Also, the human colorectal adenocarcinoma-derived LoVo cell line has been shown to be susceptible to SAR-CoV producing a sustainable infection which persists after multiple passages. Intestinal biopsies from infected patients have demonstrated viral particles on electron microscopy without any lytic effects or inclusion bodies on light microscopy [37]. The SARS-CoV and SARS-CoV-2 are closely related and possible feco-oral transmission of the virus has also been suggested. Hence, any elective gastrointestinal surgery/endoscopic procedures can pose a threat of transmission to surgeons and health care workers. Cases that clearly require emergency intervention like obstruction, perforation and massive bleeding obviously cannot be deferred. Hu et al. [38], Yu G et al. [39], Luo et al. [40] and Chen et al. [41] have reported their experience in managing colorectal and gastrointestinal malignancies during this pandemic and recommended stage-based treatment strategies. The American College of Surgeons [28] and Society of Surgical Oncology [29] have also suggested their take on the same issue; however, these are based on expert opinion rather than any strong evidence.

As cancer surgeons, one has to be aware about the prevention strategies for SARS-CoV-2 and implement this information into clinical practice to halt the spread of this pandemic. Neoadjuvant therapy should be offered wherever possible in advanced gastrointestinal cancers. Obstructing growths of gastroesophageal junction or colon without signs of peritonitis should be offered endoscopic stents wherever feasible. For bleeding tumours, Transcatheter arterial embolization is an option if facilities are available. Liver malignancies amenable to ablation, transarterial embolization and stereotactic surgery should be tackled accordingly [29]. Pre-admission screening of every patient to rule out asymptomatic infection and RT-PCR panel with chest CT scan for patients with fever (> 37.3 °C), travel history and positive contact history is recommended for gastrointestinal cancer patients due for surgery. Extra precautionary measures should be taken for medical staff involved in the surgical procedures. Local governing authorities should be informed if one has to perform any emergency surgery on SARS-CoV-2-infected patient. Cytoreductive surgeries with or without HIPEC for peritoneal surface malignancies of low-grade malignancies can be deferred. Post neoadjuvant therapy cases can continue with therapy [29]. Chinese studies have recommended a laparoscopic approach over open for colorectal surgeries; however, the measure to contain the aerosol dissemination during pneumoperitoneum has to be dealt with care [40, 41].

Thoracic Cancers

This cohort represents patients with a higher risk for deterioration of pulmonary function secondary to existing lung diseases, pneumonitis due to other infections, radiation pneumonitis, immune checkpoint inhibitor-associated pneumonia and tumour progression all which can mask an underlying SARS-CoV-2 infection. CT imaging is essential for the diagnosis of SARS-CoV-2 infection in the absence of microbiological tests and the CT picture might be confusing in these patients. Hence, a careful history of exposure, along with strong index suspicion, is required to rule out COVID-19. Smoking, one of the commonest risk factors in lung cancer, has not been independently shown to affect the mortality in SARS-CoV-2 patient; however, pre-existing chronic obstructive lung disease is associated with increased mortality [4]. Perforated oesophageal malignancies, threatened airways, anastomotic leaks, bleeding, post-operative complications like hemothorax, and empyema need immediate intervention and need to be taken to theatre on priority basis [28]. Tian et al. [42] reported post-operative mortality in one out of two patients with lung cancer, who were detected SARS-CoV-2-positive after surgery. Xin et al. [43], Yan et al. [44] have reported specific recommendations for the management of lung cancer in the COVID-19 epidemic, but these articles are published only in the Chinese language and hence difficult to interpret for others.

Head Neck Cancers

Oropharyngeal malignancies pose a clear threat of aerosol exposure even with simple clinical examination. Elective surgery of the upper airways requiring mandatory post-operative assisted mechanical ventilation, elective tracheostomies and extensive reconstructions should be preferably be deferred on case-to-case basis. Direct and fibre optic laryngoscopy should be deferred. If it has to be done, then use adequate anaesthesia, avoid looking directly through the lens and attach a monitor. Neck node FNAC can be opted over endoscopic biopsy of hypopharyngeal/laryngeal malignancy wherever possible. Emergency tracheostomy is a very high-risk procedure, hence adequate PPE, use of adequate anaesthesia to abolish cough reflex, and use of cuffed (preferably double lumen) tubes to avoid repeated suctioning are necessary. There is currently no literature on experience from COVID-19 in head and neck malignancies, and there is a lack of clear recommendations on triage in these cases.

Urological Cancers

Reports so far have failed to demonstrate shedding of SARS-CoV-2 in urine [5]. Prostate cancer and most renal malignancies have slow doubling times, and surgery can be safely deferred for few days. Cystectomies for muscle-invasive bladder malignancies, nephrectomies for cT3+ tumours, retroperitoneal lymph node dissections for post chemotherapy testicular cancers, orchidectomy for testicular cancer and surgeries for clinically obstructing urethral malignancies should be performed with due precautions [14].

Breast, Soft Tissue and Gynaecological Cancers

During the crisis, breast cancer surgery for early lesions and suspected benign pathology should be postponed, and those who have finished neoadjuvant therapy can wait for an additional 2–3 weeks on case-to-case basis. Those with progressive disease on systemic therapy, angiosarcoma and malignant phyllode tumours should be offered surgery on a priority basis. Most surgeries for endocrine tumours can be postponed, unless those with impending airway threat, pheochromocytoma and functional neuroendocrine tumours refractory to medical management. Gynaecological malignancies can be aggressive if delayed, hence most guidelines recommended to go ahead with surgery wherever feasible. Infections including joints and impending pathological fractures including peri-prosthetic fractures, soft tissue extremity sarcomas in the radiation or chemotherapy window and aggressive benign tumours like giant cell tumours should be offered surgical interventions as and when required [28,29,30, 45].

To summarise, in the absence of actual data on cancer surgery care during this pandemic, clinical decisions should be based on careful consideration of disease-related and patient-related factors. While some of the cancer surgeries can be safely delayed for some time, how long we can delay surgeries safely cannot be answered/explained by any means. Thorough evaluation and discussion by an expert and experienced multidisciplinary team appears to be the most effective way forward; however, the pandemic is likely to have an adverse impact on a number of cancer patients due to the inevitable delay caused in their treatment. In the future, while such pandemics may still crop up and cannot be prevented, the health care system and infrastructure should be boosted in anticipation, to combat illnesses such as cancer during these natural calamities.

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Correspondence to Rajesh S. Shinde.

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Shinde, R.S., Naik, M.D., Shinde, S.R. et al. To Do or Not to Do?—A Review of Cancer Surgery Triage Guidelines in COVID-19 Pandemic. Indian J Surg Oncol 11, 175–181 (2020). https://doi.org/10.1007/s13193-020-01086-7

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Keywords

  • Cancer
  • Surgery
  • Triage
  • Guidelines