Esophageal cancer has seen a considerable change in management and outcomes over the last 30 years. Historically, the overall prognosis has been regarded as poor; however, the use of multimodal treatment and the integration of enhanced recovery pathways have improved short- and long-term outcomes.
The aim of this study was to evaluate the changing trends in presentation, management, and outcomes for patients undergoing surgical treatment for esophageal cancer over 30 years from a single-center, high-volume unit in the UK.
Patients and Methods
Data from consecutive patients undergoing esophagectomy for cancer (adenocarcinoma or squamous cell carcinoma) between 1989 and 2018 from a single-center, high-volume unit were reviewed. Presentation method, management strategies, and outcomes were evaluated. Patients were grouped into successive 5-year cohorts for comparison and evaluation of changing trends.
Between 1989 and 2018, 1486 patients underwent esophagectomy for cancer. Median age was 65 years (interquartile range [IQR] 59–71) and 1105 (75%) patients were male. Adenocarcinoma constituted 1105 (75%) patients, and overall median survival was 29 months (IQR 15–68). Patient presentation changed, with epigastric discomfort now the most common presentation (70%). An improvement in mortality from 5 to 2% (p < 0.001) was seen over the time period, and overall survival improved from 22 to 56 months (p < 0.001); however, morbidity increased from 54 to 68% (p = 0.004).
Long-term outcomes have significantly improved over the 30-year study period. In addition, mortality and length of stay have improved despite an increase in complications. The reasons for this are multifactorial and include the use of perioperative chemo(radio)therapy, the introduction of an enhanced recovery pathway, and improved patient selection.
Esophageal cancer is still widely regarded as a diagnosis with a poor outcome. Globally, it affects approximately 450,000 patients each year.1 Reported cure rates in the 1970s in the UK and US were only 4–5%, increasing to 15–18% by 2010.2,3 Significant changes in the management of esophageal cancer have been introduced over the past two decades. Neoadjuvant treatment is now regarded as the gold standard for those patients with locally advanced disease, and commonly involves the administration of chemotherapy or chemoradiotherapy.4,5,6 Furthermore, surgical techniques are evolving with the introduction of endoscopic therapy for early-stage cancers7 and minimally invasive and robotic techniques.8,9,10 There is also an increasing appreciation of improving the whole patient pathway involving prehabilitation and enhanced recovery in the immediate postoperative setting.11,12
The overall impact of these changes on survival is unknown. Understanding the impact of interventions and identifying areas where little progress has been made is key to determining which components of treatment need further targeting to try and improve outcomes.
This study evaluates outcomes following esophageal resection over the last 30 years in a single-center, high-volume unit in the UK. Key changes in management strategy and their potential impact have been highlighted. Our aim was to identify changes in patient management and outcomes.
Patients and Methods
A contemporaneously maintained database of all patients with carcinoma of the esophagus or gastroesophageal junction between 1989 and 2018 was reviewed. Patients were discussed by the multidisciplinary team (MDT) and underwent staging investigations that evolved over the time period of this study. Patients who underwent esophagectomy with curative intent for cancer of the esophagus or gastroesophageal junction were included.
Initial staging comprised endoscopy with biopsy, endoscopic ultrasonography, and a thoracoabdominal computed tomography (CT) scan. A positron emission tomography (PET [CT]) scan was not part of the initial staging but was increasingly used over the time interval and is now part of routine care. In the early part of the study period, bone scans were employed to help determine if there was metastatic disease. Staging laparoscopy with washings for cytology was employed where there was an abdominal component to the disease, and neck ultrasound and fine needle aspiration (FNA) were employed where concerns about neck pathology existed. Staging was updated according to the TNM 8th edition.13
During the early part of the study period, patients with proven cancer were offered transthoracic esophagectomy as a unimodality treatment. As neoadjuvant therapy became the standard of care, those with cancer staged at T2 N0 or earlier, and those with concerns that neoadjuvant treatment would decondition the patient such that they may not receive surgery, were offered unimodality treatment in the form of surgery. Those diagnosed with locally advanced disease (T3+ or N+) were treated with neoadjuvant chemo/radiotherapy followed by surgery.
Multiple neoadjuvant regimens were employed in the present study, determined by the standard of care and recruiting trials at the time of each patient’s treatment. This included cisplatin and fluorouracil as per the OE02 regimen;6 epirubicin, cisplatin, and either fluorouracil or capecitabine (ECF/ECX) as per the MAGIC regimen;5 and chemoradiotherapy as per the CROSS regimen, as the main neoadjuvant treatments employed.
Transthoracic esophagectomy with two-field lymphadenectomy using a conventional approach as previously reported14,15,16 was the most frequently performed procedure. Patients were routinely discharged post-surgery to critical care (high dependency unit or intensive treatment unit).
An enhanced recovery protocol was initially piloted in 2014 and became the standard of care in 2016. This followed the principles of early patient mobilization, earlier enteral nutrition, and a standardized feeding protocol for patients using their feeding jejunostomy, which have always routinely been placed. In addition, the use of epidurals to provide postoperative analgesia have been superseded by multimodal analgesia, including intrathecal diamorphine, local anesthetic catheters into the paravertebral and rectus sheaths, and patient-controlled analgesic opioids postoperatively.17 Patients staged as having an early (T1) cancer with a tumor that was amenable to endoscopic mucosal resection (EMR) were offered this as a potentially curative treatment during the latter years of this study. The initial procedure was performed in 2007, however this became an established modality from 2014 onwards. Patients offered this treatment were kept under close surveillance and surgery was offered if recurrence occurred, and subject to staging described above.
Histopathological reporting was carried out by specialist gastrointestinal pathologists using a standardized proforma in line with guidelines produced by the Royal College of Pathologists. This included tumor type and differentiation, depth of tumor infiltration, and degree of tumor regression according to the Mandard criteria. The total number of lymph nodes and number of nodal metastases from each location were also recorded.18 From 1998 onwards, histology specimens were dissected by the operating surgeon into lymph node regions, as has been previously described.19
Follow-Up and Definition of Recurrence
All patients were seen at the outpatient clinic at 3- to 6-month intervals during the first 2 years and every 6 months or annually thereafter, After 5 years, follow-up was on a yearly basis for a total of 10 years. Follow-up was extended until August 2019, ensuring a minimal potential follow-up of 36 months for the evaluation of long-term survival. Recurrence of disease was made on clinical grounds and was confirmed with either CT scans or endoscopically.
Categorical variables were compared using the Chi square test, and non-normally distributed data were analyzed using the Mann–Whitney U test. Survival was estimated using Kaplan–Meier survival curves and compared using the log-rank test. Multivariable analyses used Cox proportional hazards models (“Appendix 1”). A comparison of outcomes between 5-year periods (1989–1993, 1994–1998, 1999–2003, 2004–2008, 2009–2013, 2014–2018) was also performed. For the final cohort, patients were included up to January 2017 to allow for a minimum 3 years of follow-up. A p value < 0.05 was considered to be statistically significant. Data analysis was performed using R Foundation Statistical software (R 3.2.2) with TableOne, ggplot2, Hmisc, Matchit and survival packages (The R Foundation for Statistical Computing, Vienna, Austria), as previously reported.
As a review of past practice and outcomes, this study was deemed exempt from the need for ethical approval.
Between 1989 and 2018, 1486 patients underwent esophagectomy for esophageal cancers performed by 12 different surgeons. Median age of the entire cohort was 65 years (interquartile range [IQR] 59–71) and 1105 (75%) patients were male. Adenocarcinoma was the predominant subtype (75%, n = 1114 patients), although the proportion changed throughout the 30 years evaluated, from 54% to a maximum of 77% (p < 0.001). The majority of patients underwent two-stage, two-field transthoracic esophagectomy (96%, n = 1429 patients) and 3% underwent three-stage esophagectomy.
Over this 30-year time period, there was an increase in the number of patients undergoing esophagectomy in each 5-year period (Fig. 1). Over the study period, presenting symptoms changed, with a significant fall in the number of patients presenting with weight loss, from 73% in the initial time period to 42% in the final time period (p < 0.001). This correlated with a steady increase in the body mass index (BMI) of patients at presentation, from 24 to 27 kg/m2 (p < 0.001), and fewer patients presenting with anorexia, from 32% in the early time cohort to 5% (p < 0.001) [Table 1]. The most common presentation for patients in the most recent cohort was epigastric discomfort, 70% of whom stated it was a symptom, compared with 10–17% in the earliest two cohorts (p < 0.001). Patient presentation with regurgitation fell steadily over the years studied, from 56 to 21% (p < 0.001), while other ‘red flag’ symptoms or prompts for investigation, such as dysphagia, nausea, reflux, and anemia, fluctuated between cohorts and showed no steady trend.
Changes in Staging
Over the study period, a gradual evolution of staging investigations was employed. The routine use of bone scans was phased out and PET/CT scans have become standard for all patients being considered for curative treatment. Endoscopic ultrasound is now also routinely performed to help evaluate the depth of tumor invasion and local lymph node involvement. Those who underwent surgery were increasingly at a more advanced clinical stage (stage III/IV), with 74% of patients in the earlier cohort having stage 2 disease or lower, compared with 20% in the final cohort (p < 0.001).
Changes in Pathology
Median lymph node yield was significantly lower in the first two cohorts (10 & 19 nodes) compared with the last three cohorts (30–34 nodes, p < 0.001), although longitudinal R0 resection rates were consistently under 5%19 (Table 2 and “Appendix 2”).
Overall median survival for the entire cohort was 29 months (IQR 15–68 months). There was a fall in in-patient mortality, from 5 to 2%, between the first and last cohorts (p = 0.002). Median survival increased between each cohort, from 22.1 months in the first cohort to 56.0 months in the final cohort (p < 0.001). Overall complications were 65%, which increased over the time period and were initially 54% through to 68% in the latest cohort (p = 0.004). However, there were no significant differences in the anastomotic leak rate between the time cohorts, varying from 7 to 11% (p = 0.6) [Table 3].
Patients Undergoing Thoracoscopic Surgery
A thoracoscopic program commenced in October 2014. Over this time period, 50 patients underwent thoracoscopic procedures, with four conversions to an open thoracotomy. The median age of patients was 66 years (IQR 60–71), 79% were male, and 20% were squamous cell carcinomas. There was no mortality in this cohort and the median length of stay was 8 days (versus 11 days for open thoracotomy; p < 0.001), with an overall complication rate of 66%. Median lymph node yield was 36 (IQR 27–42), with no R1 resections recorded.
Patients Undergoing Endoscopic Mucosal Resection
Overall, 197 EMRs were undertaken in 157 patients with curative intent. The median age of patients was 70 years (IQR 61–78). The initial EMR was undertaken in 2007; however, only 13 patients underwent EMR between 2007 and 2011. The final 5-year cohort included 127 patients. Of the 157 patients, 43 (27%) subsequently underwent esophagectomy; there have been no deaths in any of these 43 patients.
A number of notable interventions occurred during the time frame of this study. These are highlighted in Fig. 1, which demonstrates the trend in the number of cases performed and also demonstrates the relative impact on 5-year survival, length of stay, and the proportion of patients with stage III and IV disease.
The major interventions included are (Fig. 2):
Institution of MDT meetings 1990
Barrett’s surveillance program, 1991
Centralization of cancer work, 1998
Routine neoadjuvant treatment, 2006
Cardiopulmonary exercise testing (CPET as standard, 2014
Routine enhanced recovery, 2015
Introduction of prehabilitation, 2018
The results from this study highlight the changing trend in presentation, management, and outcomes of patients with esophageal cancer. Perhaps the most noteworthy, but not unexpected, finding is the considerable improvement in patient survival over the last 30 years. Median survival for all patients undergoing surgery is now 52 months, reflecting a 5-year survival of just under 50%—nearly double what it was in the early part of the study period. The reasons for this are likely to be multifactorial, but the largest impact is probably due to the establishment of neoadjuvant treatment for patients with locally advanced disease. Patients first received neoadjuvant treatment in 1998, and subsequent cohorts where the use of neoadjuvant treatment became the standard for locally advanced cancer demonstrated a significant jump in survival from the earlier cohorts. The OE02 study showed a 6% 5-year survival benefit associated with neoadjuvant chemotherapy when compared with surgery alone.6 These findings were supported by the UK MAGIC study, which reported a 13% improvement in 5-year survival associated with the use of perioperative chemotherapy in esophagogastric cancer.5
In addition, this study showed that in-hospital mortality also fell from an initial 5% to 2%, which may reflect increased experience in managing postoperative complications.20,21 The UK national audit has placed the current mortality from esophagectomy at approximately 3%, but this is a dramatic reduction in mortality compared with what was reported towards the end of the last century.22,23 Further to the improved survival was a reduction in the length of stay in hospital over the time period. This was most noticeable in the final cohort, which coincides with the institution of a standardized enhanced recovery program. There was no change in the median length of critical care stay over the 30-year period. The data do not contain information as to why patients may have a prolong critical care stay, with there likely being multiple reasons, including patient need (e.g. vasopressor support), availability of a stepdown level 1 ward bed, or a feeling that prolong observation was required in critical care due to comobidities. It is worth nothing that prior to 2001, patients were routine returned to critical care intubated post procedure, with planned extubation the following day. However, this change of practice has not impacted on overall critical care stay, although it will have significantly reduced the need for level 3 care and increased the use of level 2 beds.
To contrast this, there has been a steady increase in the overall reported incidence of complications, which, in the latest cohort, was 71%. The reported postoperative complications in the literature vary at between 40 and 75%, which is consistent with what was found throughout each of the time periods. Possibly the two main reasons for the increased level of complications are more assiduous reporting and an increased diagnosis of patients with ‘curable’ disease but a higher level of comorbidity. This is reflected in the increased BMI of patients over the time period and worse American Society of Anesthesiologists (ASA) score of those undergoing surgery. Despite this, the results demonstrate that a standardized surgical approach, careful consideration of the patient pathway, which saw the introduction of multiple components, including neoadjuvant treatment for locally advanced disease, CPET, and the institution of an enhanced recovery after surgery (ERAS) program, can lead to improved patient outcomes.21,24,25 However, it is important to constantly evaluate current practices. Such an ethos led to the acceptance by the clinical team that multimodal analgesia provides excellent outcomes for patients.
Another recent intervention has been the increasing use of thoracoscopic surgery. This was implemented in the final cohort, with the ethos of maintaining the same level of lymphadenectomy as performed with an open operation. Within this final time frame, 50 patients underwent a thoracoscopic chest phase, with only four (8%) requiring conversion to an open procedure. The overall median length of stay was 8 days, which compared favorably with the open cohort, with a similar complication rate (66%) and no mortality.
A further notable finding was the change in frequency of presenting symptoms. Nearly two-thirds of patients now state abdominal discomfort as a presenting symptom compared with under 20% at the end of the last century. This might highlight an increasing awareness of the implication of epigastric symptoms among primary care physicians, or increased inclination to investigate these symptoms at an earlier stage. A previous study indicated that only carrying out endoscopy in dyspeptics with ‘alarm’ symptoms would overlook a significant proportion of patients with a malignancy.26 Thus, better access to endoscopic evaluation may have contributed to patients being picked up at a potentially curable stage, and may in turn contribute to the steady increase in the number of operations performed each year. The future may present methods to aid screening for these cancers, such as a cytosponge.27
Despite the increased number of operations that have occurred each year, there was a negligible increase in the number of patients with stage 1 disease who underwent surgery. The recognition that an EMR can achieve good oncological outcomes for those with early disease confined to the mucosa, where lymph node metastasis is yet to occur, has meant that fewer patients have needed to be subjected to the morbidity of an esophagectomy. The first EMR was performed in 2007; however, only a small number of patients underwent this procedure in the first few years, and this became established as an intervention within the final cohort, with 127 patients having an EMR with the intention to treat cancer. While an EMR can be used to cure early cancers (T1a), debate remains regarding its use for more advanced (T1b) cancers. It is also possible to employ this as a treatment for those who may be regarded as too frail for a more invasive esophagectomy. Importantly, none of the patients who underwent an EMR and subsequently had an esophagectomy have died, suggesting that an EMR does not compromise patient outcomes, although the introduction of an EMR is likely to have influenced the overall number of procedures that have been performed and also the number of patients with an early-stage cancer.
The major shortcoming of this study, which could also be argued as being its main strength, is that data have come from a single center with consistent reporting over time. It highlights the changes that have occurred in esophageal cancer treatment and the benefits of standardization of care. Over the 30-year period, 12 surgeons have been responsible for performing resections. The latest cohort included a small number of patients who underwent a thoracoscopic chest phase, but, despite this, perioperative management and surgical dissection and reconstruction were consistent with those having open surgery. Other deficits include a lack of data on comorbidities, with the ASA score used as a surrogate within the study. Arguably one of the most important factors that this paper does not address is postoperative quality of life. This should be a key consideration, especially when minimally invasive and robotic techniques are being considered for patients. While some of the changes have been highlighted throughout this paper, this list is unlikely to be exhaustive and it is impossible to quantify the impact of changes in nutritional assessment and management within the critical care environment, and perioperatively, that may have contributed towards the improved outcome. It is also impossible to fully quantify the impact of the changes that have been implemented due to these confounding factors.
A number of fundamental changes to the management of esophageal cancer patients have been integrated that will affect patients, subsequent to those included in this study. Prehabilitation has been shown to aid patients in maintaining fitness during neoadjuvant chemotherapy, and a pragmatic approach that is accessible to all patients has been instituted. The recently published FLOT trial has indicated a significant survival improvement for patients and this may further enhance the outcomes seen.28 The ability to identify biomarkers for prognostication and tailoring of treatment will surely ensue over the next 30 years, as might methods for screening for esophageal cancer, allowing more patients to be identified at earlier stages.
From a surgical perspective, minimally invasive techniques and robotic technology may help reduce morbidity.29 However, throughout this study, patients had a radical lymphadenectomy, which has been demonstrated to improve outcomes, and care must be taken to observe oncological principles.30,31 The standardization of reporting outcomes and complications will help facilitate meaningful comparison of data between units and the production of robust studies to improve outcomes.32 It may be that technology such as indocyanine green-enhanced fluorescence can improve anastomotic outcomes,33,34 or that an improved method of identifying lymph node involvement can help tailor the extent of lymphadenectomy required,35,36,37 given previous studies have highlighted relative unpredictability in this area.38,39
This study highlights the continual evolution in the treatment and outcomes of patients with esophageal cancer. There is ever-increasing research to allow tailoring of oncological therapies for the improvement of patient outcomes, and these results have indicated that a consistent surgical approach that has been adopted by all team members provides excellent surgical outcomes. Adjuncts that aid decision making, improve the fitness of patients, and enable better postoperative rehabilitation need constant evaluation so they can be appropriately integrated to further enhance outcomes. These results serve to highlight areas where little progress has been made over the last 30 years. Rates of morbidity, including anastomotic leak and pulmonary complications, are areas that need to be focused on in the future.
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The authors would like to thank Helen Jaretzke, Data Manager at the Northern Oesophagogastric Unit, and Barry Dent, who was involved in evaluating a 25-year data set.
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Griffin, S.M., Jones, R., Kamarajah, S.K. et al. Evolution of Esophagectomy for Cancer Over 30 Years: Changes in Presentation, Management and Outcomes. Ann Surg Oncol 28, 3011–3022 (2021). https://doi.org/10.1245/s10434-020-09200-3