Signet ring cell adenocarcinomas (SRCCs) are a rare histological subtype of adenocarcinomas with a poor prognosis, typically due to advanced disease at diagnosis. A signet ring cell, mimicking its moniker, contains abundant intracytoplasmic mucin that pushes the nucleus to the periphery. In these cancers, this cell feature comprises more than 50% of the tumor. Despite predilection for the gastrointestinal tract, and in particular the stomach, primary SRCCs are also described in other sites, typically in case reports. This literature, however, lacks a standardized overview of the SRCC disease entity. Using a retrospective cohort approach, we summarize the clinicodemographic and mortality outcomes of SRCCs in thirteen primary sites, comprising 95% of all SRCCs in the Surveillance, Epidemiology, and End Results Program (SEER), a population-level cancer database covering nearly one-third of the United States population. SRCCs general trends compared to matching nonvariant adenocarcinomas are earlier age of onset, with initial presentation favoring higher rates of regional or distant disease presentation and poor tumor differentiation. After multivariable analysis, SRCCs typically have worse overall survivals, but substantial variances exist depending on tumor location. Identifying SRCCs at earlier disease stages is likely the single most important intervention to improving outcomes for these patients.

Hereditary diffuse gastric cancer (HDGC) is a rare signet-ring cell adenocarcinoma (SRCC) linked to CDH1 (E-cadherin) inactivating germline mutations, and increasingly other gene mutations. Female CDH1 mutation carriers have additional risk of lobular breast cancer. Risk management includes prophylactic total gastrectomy (PTG). The utility of endoscopic surveillance is unclear, as early disease lacks macroscopic lesions. The current systematic biopsy protocols have unknown efficacy, and other secondary cancer risks are postulated. We conducted a retrospective study of consecutive asymptomatic HDGC patients undergoing PTG, detailing endoscopic, pathologic, and outcome results. A systematic review compared endoscopic biopsy foci detection via random sampling versus Cambridge Protocol against PTG findings. A population-level secondary-cancer-risk postulation among sporadic gastric SRCC patients was completed using the Surveillance, Epidemiology, and End Results database. Of 97 patients, 67 underwent PTG, with 25% having foci detection on random endoscopic biopsy despite 75% having foci on final pathology. There was no improvement in the endoscopic detection rate by Cambridge Protocol. The postulated hazard ratio among sporadic gastric SRCC patients for a secondary colorectal SRCC was three-fold higher, relative to conventional adenocarcinoma patients. Overall, HDGC patients should not rely on endoscopic surveillance to delay PTG, and may have secondary SRCC risks. A definitive determination of actual risk requires collaborative patient outcome data banking.

Mucinous (colloid) adenocarcinomas (MAs) are a rare histological subtype of adenocarcinomas where extracellular mucin comprises more than 50% of the tumor. Most literature on MAs relate to cancers from colorectal and breast sites; however, the literature lacks a standardized overview of the MA disease entity. Particularly in colorectal cancer, some MAs may have signet ring cells floating within the mucin, which may represent a highly metastatic phenotype. MAs and signet ring cell adenocarcinomas represent a spectrum of mucin-producing neoplastic conditions where in the latter most mucin is intracellular rather than extracellular. We recently published a standardized overview of signet ring cells, and in this companion work, using a retrospective cohort approach, we summarize the clinicodemographic and mortality outcomes of MAs in sixteen primary sites, comprising 95.6% of all MAs in the Surveillance, Epidemiology, and End Results Program (SEER), a population-level cancer database covering nearly one-third of the United States population. Compared to matching nonvariant adenocarcinomas, MAs have a slightly earlier age of onset with increased rates of regional and distant disease at presentation. Survival outcomes are highly dependent on tumor location, illustrating our poor understanding of MA tumor biology. The clinical significance of MA histology depends largely on tumor site.

Research and surgical residency: moving beyond one-and-done projects and motivating for scholarly excellence W ithin surgical residency, few activities evoke such a myriad of responses as research. On one end there will be residents who relish the opportunity to break new ground in knowledge generation and may even extend their training timelines to obtain graduate degrees. On the opposite end, some residents will work to actively fill their dedicated research blocks with other pursuits and hope that what output they may have to reluctantly generate will meet their program requirements. Most residents fall between these ends of the spectrum, neither entirely avoiding nor actively contributing to scholarly pursuits. Changes in the current training model need to occur to allow research to play a more foundational role in the development of surgical residents.Perceptions of the value of resident research in surgical residency and quantification of output is sparse, especially in the Canadian literature. Following the implementation of a formal surgical resident research program at a Canadian academic centre, the number of abstracts and publications per resident increased dramatically. 1 However, during the same time period, a decreased percentage of residents agreed with the idea that residents should be expected to conduct research during their training. 1 The biggest barriers identified to successful surgical resident research included lack of hypothesis guidance; lack of methodological support; lack of time; and, for nearly 20% of residents, lack of interest. 1 None of these barriers are insurmountable, and they require more attention from residency training programs.Cynicism among trainees should not be entirely surprising. Surgical residency is an onerous commitment following at least 6 previous years of postsecondary education. Given the tight job market for many surgical specialties in Canada, particularly in academic centres, research is increasingly perceived as a means of improving the odds of not only securing a fellowship, but also getting a staff position. A recent cross-sectional survey of academic general surgery in Canada showed that nearly three-quarters of graduates had

Bariatric patients are difficult to assess clinically for signs of postoperative complication. Diagnostic laparoscopy (DL) is used to investigate patients suspicious for complications such as anastomotic leak (AL) and intra-abdominal hemorrhage (IH). Most bariatric surgeons use DL in the presence of sustained tachycardia; however, the rate of this procedure and its clinical value have not been sufficiently investigated.A retrospective review of patients undergoing bariatric surgery from January 2010 to December 2011 was performed. Data from 4 collaborative bariatric centres of excellence were included in this analysis. From among all elective bariatric procedures, cases that required early reoperation were selected for further evaluation.A total of 1001 elective bariatric procedures were identified. Of these, 952 (95%) were primary bariatric procedures, including 866 (91%) Roux-en-Y gastric bypasses and 86 (9%) sleeve gastrectomies. The remaining 48 cases represented revisional proced ures. Of these, 11 patients (1.1%) returned to the operating room within 72 hours for DL: 64% were primary cases (n = 7) and 36% revisional cases (n = 4). Intraoperative findings included AL (45%, n = 5), IH (27%, n = 3), no pathology identified (18%, n = 2) and small bowel obstruction (9%, n = 1). Of the 9 patients with complications, all were tachycardic (heart rate > 100 beats/min), and 4 of the 5 patients with AL were febrile (t > 37.5). There were no reported adverse events directly related to the use of DL.Diagnostic laparoscopy is a useful and safe option for both the diagnosis and treatment of suspected complications after bariatric surgery. The majority of patients returning to operating room had significant findings, and all were treated laparoscopically. Persistent postoperative tachycardia or fever were highly predictive of positive findings during DL. An emphasis on early decisionmaking and expeditious return to the operating room for laparoscopy should be the standard for bariatric patients on clinical suspicion of a postoperative complication. 4Changes of active and total ghrelin, GLP-1 and PYY following restrictive bariatric surgery and their impact on satiety: comparison of sleeve gastrectomy and adjustable gastric banding. A

Canadian assoCiation of BariatriC PhysiCians and surgeons assoCiation Canadienne des médeCins et Chirurgiens Bariatriques 02The usefulness and costs of routine contrast studies after laparoscopic sleeve gastrectomy for detecting staple line leaks. P

Signet ring cell adenocarcinomas (SRCCs) are a rare histological adenocarcinoma subtype, classically thought to have a worse prognosis than conventional adenocarcinomas. The majority of these cancers occur in the stomach, colon, and rectum. Their rarity means that most epidemiological studies into their pathology are often underpowered, and interpretations from these reports are mixed. In this study, we use the Surveillance, Epidemiology, and End Results Program (SEER) database to examine the effects of tumor localization, age, and stage on gastric and colorectal cancer outcomes. For early onset localized and regional gastric cancers, SRCCs have the same overall risk of mortality compared to conventional adenocarcinomas. Over the age of 50 years, SRCCs have worse outcomes across all stages. Gastric SRCCs are 2–3-fold more likely in younger patients, and more heavily favor the distal stomach. Like conventional adenocarcinomas, proximal gastric SRCCs have decreased survival. Across all ages, stages, and locations, colorectal SRCCs have worse outcomes. SRCCs favor the right colon, but outcomes are significantly worse for the left colon and rectal cancers. Relative to adenocarcinomas, colorectal SRCCs have the worst outcomes in younger patients. Overall, these results provide insights into SRCC disease patterns that cannot be surmised outside of population-level data.

Gastric signet-ring-cell adenocarcinoma (SRCC) is a rare disease entity, often characterized by early age of the onset and sometimes attributable to heritable genetic mutations. Overall prognosis is usually poor due to diagnosis at late stages. There are a handful of case reports that describe patient presentation with retroperitoneal fibrosis secondary to malignancy from a concurrent gastric SRCC found on the workup. No information exists on timing from primary tumor development to retroperitoneal disease. Further, there is speculation that gastric SRCC may have an indolent phase prior to symptomatic disease, but its natural history is essentially entirely unknown. In this case report, we describe a 39-year-old male with an incidentally discovered gastric SRCC who then underwent multimodality treatment with curative intent. No evidence of recurrence was documented on interval surveillance scans for 4.5 years, at which point, he rapidly developed a large retroperitoneal mass that was biopsied for metastatic disease. He succumbed to his pathology within 6 months. This presentation suggests that gastric SRCC could have both a relatively long indolent phase and an unpredictable propensity for explosive metastatic progression. Tumor biology factors that affect this balance are not understood.