Clinical and molecular diagnosis of pathologic complete response in rectal cancer: an update

INTRODUCTION

The standard of care for locally advanced rectal cancer includes neoadjuvant chemoradiation with subsequent total mesorectal excision. This approach has shown various degrees of response to neoadjuvant chemoradiation (ranging from complete response to further tumor growth), which have substantial prognostic and therapeutic implications. A total regression of the tumor is a predictor of superior oncologic outcomes compared with partial responders and non-responders. Further, this concept has opened the possibility of nonoperative strategies for complete responders and explains the widespread research interest in finding clinical, radiographic, pathologic, and biochemical parameters that allow for identification of these patients. Areas covered: The present review evaluates the most recent efforts in the literature to identify predictors of patients likely to achieve a complete response following neoadjuvant treatment for the management of rectal cancer. This includes clinical predictors of pathologic complete response such as tumor location, size, and stage, molecular predictors such as tumor biology and microRNA, serum biomarkers such as carcinoembryogenic antigen and nomograms. Expert commentary: There has been significant progress in our ability to predict pathological complete response. However, more high-quality research is still needed to use this concept to confidently dictate clinical management.

A case report of a groin pseudocyst following inguinal hernia repair and a review of the literature

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Groin pseudocyst is a rare complication following inguinal hernia repair. Only two previous cases reported in the literature.

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Pseudocysts can develop following open and laparoscopic mesh repair. Surgery is required for definitive management.

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In this report, we discuss a patient who had a groin pseudocyst 5 years after the original operation to repair his hernia.

Introduction

Groin hernias are one of the most common general surgery operations performed worldwide and in the United States. We present an exceedingly unusual complication of a patient who underwent a posterior repair of an inguinal hernia.

Presentation

A 48-year-old man presented to our hospital with a chronically enlarging left groin mass for five years following a total extraperitoneal repair of a unilateral inguinal hernia. Two separate aspiration interventions led to rapid re-accumulation of the fluid. Physical exam demonstrated a large inguinoscrotal mass in the left groin. It was non-tender and there were no overlying skin changes. His testicles were palpable at the bottom of the scrotum. A computed tomography exam demonstrated evidence of a prior left inguinal hernia repair. The left groin/scrotum had a 12 cm fluid collection with incomplete peripheral calcification, consistent with previous history of seroma. An indirect hernial sac could not be excluded from the diagnosis. During groin exploration an inguinal canal pseudocyst was removed in its entirety without violating the capsule. The patient recovered well; there was no recurrence at a six month follow up. Review of the literature revealed that only two other cases had been reported, but in contrast to our case, the previous cases had an anterior repair for the index operation and the pseudocysts were open and partly resected.

Conclusion

Post-operative inguinal pseudocysts are exceedingly rare. Our case is the third reported in the literature. They can develop following open and laparoscopic mesh repair. Surgical intervention is required for definitive management.

Outcomes of appendectomy in elderly veteran patients

BACKGROUND

Some studies indicate that noncomplicated acute appendicitis might be treated exclusively with antibiotics instead of an appendectomy. This study was undertaken to assess outcomes in elderly veterans and to determine if operative intervention would lead to substantial complications such that a nonoperative strategy should be investigated.

METHODS

A retrospective, single-institution analysis was conducted of patients who underwent an appendectomy at the VA North Texas Health Care System over a period of 12 years (from July 2005 to June 2017). Patients who underwent an appendectomy for cancer, interval appendectomy, exploratory laparotomy for perforated appendicitis, or appendectomy as part of another major operation were excluded from the study. Patients were then grouped as elderly (≥60 years old) and young (<60 years old), and differences in outcome were assessed. Univariate and multivariate analyses were also performed to determine if age and comorbid conditions were independent predictors of complications in both cohorts.

RESULTS

Of patients who underwent an appendectomy for acute appendicitis (n = 257, male = 90.7%, age = 45.4 ± standard deviation 15.6 years, body mass index = 30.3 ± 6.3 kg/m²), 195 were young (38.7 ± 11.2 years old) and 62 elderly (66 ± 5 years old). More patients were male in the elderly cohort (98.4% vs 88%; P = .01). The incidence of gangrenous and perforated appendicitis was greater in elderly patients (11.3% and 14.4% vs 24 % and 40%, P < .01 each). Diabetes and hypertension, as well as a history of cardiac, pulmonary, and renal diseases, were more than 2-fold greater in older patients. Complications and 30-day readmission rates were similar in both groups (young vs elderly: 7.2% and 9% vs 9.7% and 11%, P > .5 each). Logistic regression analysis showed that age and American Society of Anesthesia level were not independent predictors of complications. A history of cardiac disease and open operation independently predicted complications regardless of age. Unexpected malignancy was 3% in the elderly and 1.5% in the young cohort (P = .6) CONCLUSION: Complicated appendicitis is more common in elderly patients. Appendectomy in elderly veteran patients has a low rate of complications similar to younger patients and the private sector. Operative intervention in this group of patients is not prohibitive. Further studies are needed to determine if nonoperative intervention is noninferior to an appendectomy in this high-risk patient population.

Assessing the Veterans Affairs Surgical Quality Improvement Program Risk Calculator in Cholecystectomy

The Veterans Affairs Surgical Quality Improvement Program (VASQIP) risk calculator has been validated for several operations but has not been assessed specifically for cholecystectomy. Our aim was to externally validate the VASQIP calculator's accuracy in predicting 30-day morbidity and mortality (M&M) for patients undergoing cholecystectomy. A retrospective review of patients undergoing cholecystectomy at the North Texas Veterans Affairs hospital was performed. The VASQIP risk calculator was used to determine predicted 30-day M&M, which was compared with actual M&M. The predictive accuracy of the Veterans Affairs risk calculator was assessed using the C-statistic and a graphical assessment of a locally weighted least squares regression smoother. Overall, 848 patients were included in the study. Actual M&M were 6.3 and 0.94 per cent, respectively, whereas predicted M&M were 6.0 and 0.54 per cent. The C-statistic was 0.75 for morbidity and 0.78 for mortality. In our analysis, the VASQIP risk calculator reasonably predicted 30-day M&M.

Assessing the Veterans Affairs Surgical Quality Improvement Program Risk Calculator in Cholecystectomy

The Veterans Affairs Surgical Quality Improvement Program (VASQIP) risk calculator has been validated for several operations but has not been assessed specifically for cholecystectomy. Our aim was to externally validate the VASQIP calculator's accuracy in predicting 30-day morbidity and mortality (M&M) for patients undergoing cholecystectomy. A retrospective review of patients undergoing cholecystectomy at the North Texas Veterans Affairs hospital was performed. The VASQIP risk calculator was used to determine predicted 30-day M&M, which was compared with actual M&M. The predictive accuracy of the Veterans Affairs risk calculator was assessed using the C-statistic and a graphical assessment of a locally weighted least squares regression smoother. Overall, 848 patients were included in the study. Actual M&M were 6.3 and 0.94 per cent, respectively, whereas predicted M&M were 6.0 and 0.54 per cent. The C-statistic was 0.75 for morbidity and 0.78 for mortality. In our analysis, the VASQIP risk calculator reasonably predicted 30-day M&M.

A case report of a de Garengeot hernia in a nonagenarian veteran

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A hernia containing the vermiform appendix [de Garengeot hernia (DGH)] is an exceedingly rare event.

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Most cases of DGH are made during inguinal exploration.

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In the present report, we discuss a patient who underwent an operation which revealed a DGH with appendicitis.

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This case is unusual because it occurred in a nonagenarian male veteran patient.

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The unique aspect of this case is that it was performed in its entirety under local anesthetic.

Introduction

A hernia containing the vermiform appendix [de Garengeot hernia (DGH)] is an exceedingly rare event. Appendicitis occurring in this setting if further unusual. Most cases of DGH are made during inguinal exploration. In the present report, we discuss a patient who underwent an operation which revealed a DGH with appendicitis.

Presentation of a case

A 94-year-old man with a past medical history significant for hypertension and Parkinson’s disease was admitted to the hospital for the management of an event of CHF exacerbation. He developed acute onset of a painful right inguinal bulge. He had no prior hernia history. On physical exam, he had a 3-cm, tender, non-reducible right inguinal bulge without skin changes. Laboratory analyses were normal without leukocytosis. An acute abdominal series was obtained and demonstrated no obstruction. A groin exploration was performed under local anesthetic. An abscess was found associated with a femoral hernia containing the vermiform appendix. An appendectomy was performed through the hernia sac. The hernia was repaired via a McVay technique. At thirty days after his procedure, he had no complications and no signs of recurrence.

Conclusion

Most cases of DGH are diagnosed intraoperatively. Limited work up might be sufficient for adequate management. Several surgical strategies are acceptable. Groin exploration, plus and minus an appendectomy, and tissue repair versus mesh placement are acceptable surgical strategies. Laparoscopic approach for the management of DGH has been reported.

Perforated jejunal diverticulitis in a nonagenarian veteran: A case report

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Jejunal diverticula (JD) are uncommon occurrences that frequently present as a diagnostic dilemma.

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Most JD are asymptomatic, only 15% present with surgical problems including perforation.

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Perforation from JD is exceedingly rare.

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Due to their infrequent clinical significance, complications from JD are difficult to diagnose.

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In the present report, we discuss a patient who had both sigmoid diverticula and JD.

Introduction

Jejunal diverticular (JD) disease is an uncommon occurrence that frequently present as a diagnostic dilemma. The correct diagnosis from complications of JD is typically made at laparotomy. Most JD are asymptomatic. Of clinically significant small bowel diverticula, only 15% present with surgical problems including obstruction, gastrointestinal bleed, and perforation.

Presentation of case

A 90-year-old man presented to the hospital with abdominal pain. He was clinically stable with local tenderness in the left lower quadrant. Computed tomography demonstrated a dot of free air near the sigmoid and sigmoid diverticula. He continued to have pain and clinically deteriorated following a short period of observation. He underwent an exploratory laparotomy that revealed perforated JD.

Conclusion

Perforation from JD is exceedingly rare. Due to their infrequent clinical significance, complications from JD are difficult to diagnose and therapeutic options are typically made intraoperatively. Any deviation from the expected positive pathway in the management of a suspected entity should prompt an immediate reassessment as well as definitive therapeutic options.

Laparoscopic ischemic conditioning of the stomach increases neovascularization of the gastric conduit in patients undergoing esophagectomy for cancer

BACKGROUND AND OBJECTIVES

Gastric ischemic preconditioning has been proposed to improve blood flow and reduce the incidence of anastomotic complications following esophagectomy with gastric pull-up. This study aimed to evaluate the effect of prolonged ischemic preconditioning on the degree of neovascularization in the distal gastric conduit at the time of esophagectomy.

METHODS

A retrospective review of a prospectively maintained database identified 30 patients who underwent esophagectomy. The patients were divided into three groups: control (no preconditioning, n = 9), partial (short gastric vessel ligation only, n = 8), and complete ischemic preconditioning (left and short gastric vessel ligation, n = 13). Microvessel counts were assessed, using immunohistologic analysis to determine the degree of neovascularization at the distal gastric margin.

RESULTS

The groups did not differ in age, gender, BMI, pathologic stage, or cancer subtype. Ischemic preconditioning durations were 163 ± 156 days for partial ischemic preconditioning, compared to 95 ± 50 days for complete ischemic preconditioning (P = 0.2). Immunohistologic analysis demonstrated an increase in microvessel counts of 29% following partial ischemic preconditioning (P = 0.3) and 67% after complete ischemic preconditioning (P < 0.0001), compared to controls.

CONCLUSIONS

Our study indicates that prolonged ischemic preconditioning is safe and does not interfere with subsequent esophagectomy. Complete ischemic preconditioning increased neovascularization in the distal gastric conduit.

Effect of adjuvant chemotherapy following pathologic complete response on long-term survival in rectal cancer: A propensity score matched analysis

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Background: The role of adjuvant chemotherapy following resection in patients with rectal cancer that achieve pathologic complete response (pCR) after neoadjuvant therapy is unclear. Current data have been limited by small sample size series. This study examined the impact of adjuvant chemotherapy following pCR on overall survival in a national cohort of patients. Methods: Patients with rectal adenocarcinoma were identified in the National Cancer Data Base between 2006 and 2012. Those with locally advanced tumor (clinical stage II or III) that achieved pCR (defined as ypT0N0 in surgical specimens) after neoadjuvant chemoradiotherapy (nCRT) were included in the study. We matched by propensity score patients that received adjuvant chemotherapy (ACT) and patients that did not receive postoperative treatment (no-ACT) controlling for demographic as well as perioperative patient and tumor characteristics. Overall survival was compared using a Cox proportional hazards model. Results: We identified 2,543 patients (ACT: 732, no-ACT: 1,811 patients) with resected locally advanced rectal adenocarcinoma that achieved pCR after nCRT. Among patients that received ACT, 711 were matched with 711 patients in the no-ACT group. Adjuvant chemotherapy was associated with improved overall survival compared to no-ACT (hazard ratio[HR] = 0.46, 95% confidence interval [CI] = 0.29 – 0.75). Overall survivals at 1, 3, and 5 years in the ACT and no-ACT groups were 100% vs 98% (P=0.1), 98% vs 94% (P<0.01), and 94% vs 89% (P<0.01), respectively. In subgroup analyses, adjuvant chemotherapy improved overall survival in patients with clinical stage II (HR = 0.43, 95% CI = 0.22 – 0.85) as well as stage III tumor (OR = 0.50, 95% CI = 0.26 – 0.98). Among patients that received adjuvant chemotherapy, there was no difference in overall survival between single agent and multiagent regimens (HR = 1.37, 95% CI = 0.57 – 3.29). Conclusions: Adjuvant chemotherapy may providea small long-term survival benefit in patients with resected locally advanced rectal cancer and pCR after nCRT.

Renal Cell Carcinoma Metastatic to the Scalp

Because of the asymptomatic natural history of renal cell carcinoma (RCC), by the time a diagnosis is made, metastatic disease is present in about one third of the cases. Thus, the overall survival of patients with RCC remains poor. Ultimately up to 50% of patients with RCC will develop metastases. Metastatic lesions from RCC are usually observed in the lungs, liver or bone. Metastases to the brain or the skin from RCC are rare. Here we present a patient diagnosed with RCC, found to have no evidence of metastases at the time of nephrectomy, who presented two years later with metastases to the scalp. We review the literature of patients with this rare site of metastasis and outline the overall prognosis of this lesion compared to other site of metastases from RCC.

Survival analysis of veteran patients with pancreatic cancer

OBJECTIVE

For patients with pancreatic cancer, the identification of reliable predictors of their outcomes could be invaluable for directing the managements. This study aimed to identify clinical and laboratory factors that could be used to predict early (≤6 months) or late (>6 months) mortality.

METHODS

Medical records of patients diagnosed with pancreatic cancer in the VA North Texas Health Care System from 2005 to 2010 were retrospectively reviewed. Univariate and multivariate analyses (MVA) were performed and the utility of cancer antigen 19-9 (CA19-9) test was explored.

RESULTS

Altogether 109 patients with pancreatic cancer, 89.0% of whom were with adenocarcinoma, were divided into early (n = 62) and late (n = 47) mortality groups. Kaplan-Meier analysis revealed a median survival of 154 days [95% confidence interval (CI) 93-194 days]. On MVA, abdominal pain (OR = 10.6, P = 0.009) and large tumor size (OR = 2.4, P = 0.028) were significantly associated with early mortality, while palliative chemotherapy (OR = 0.048, P = 0.001) and neuroendocrine tumor (OR = 0.009, P = 0.024) were significantly associated with late mortality. Subgroup analyses of adenocarcinoma and late-stage patients revealed similar results. Serum CA19-9 performed poorly as a prognostic indicator in both groups (P = 0.43), in metastatic disease at diagnosis (P = 0.32) and after treatment (P = 0.65).

CONCLUSIONS

Abdominal pain and large tumor size portends a poor prognosis in patients with pancreatic cancer. Palliative chemotherapy and surgical intervention may prolong the patient's survival. CA19-9 is not universally reliable for predicting metastasis, survival, or the responses to chemotherapy.

Biological Mesh Implants for Abdominal Hernia Repair: US Food and Drug Administration Approval Process and Systematic Review of Its Efficacy

IMPORTANCE

Expensive biological mesh materials are increasingly used to reinforce abdominal wall hernia repairs. The clinical and cost benefit of these materials are unknown.

OBJECTIVES

To review the published evidence on the use of biological mesh materials and to examine the US Food and Drug Administration (FDA) approval history for these devices.

EVIDENCE ACQUISITION

Search of multiple electronic databases (Ovid, MEDLINE, EMBASE, Cochrane Systematic Reviews, Cochrane Database of Abstracts of Reviews of Effects, Cochrane Central Register of Controlled Trials, and Cochrane National Health Service Economic Evaluation Database) to identify articles published between 1948 and June 30, 2015, on the use of biological mesh materials used to reinforce abdominal wall hernia repair. Keywords searched included surgical mesh, abdominal hernia, recurrence, infection, fistula, bioprosthesis, biocompatible materials, absorbable implants, dermis, and collagen. The FDA online database for 510(k) clearances was reviewed for all commercially available biological mesh materials. The median national price for mesh materials was established by a benchmarking query through several Integrated Delivery Network and Group Purchasing Organization tools.

EVIDENCE SYNTHESIS

Of 274 screened articles, 20 met the search criteria. Most were case series that reported results of convenience samples of patients at single institutions with a variety of clinical problems. Only 3 of the 20 were comparative studies. There were no randomized clinical trials. In total, outcomes for 1033 patients were described. Studies varied widely in follow-up time, operative technique, meshes used, and patient selection criteria. Reported outcomes and clinical outcomes, such as fistula formation and infection, were inconsistently reported across studies. Conflicts of interest were not reported in 16 of the 20 studies. Recurrence rates ranged from 0% to 80%. All biological mesh devices were approved by the FDA based on substantial equivalence to a group of nonbiological predicate devices that, on average, were one-third less costly.

CONCLUSIONS AND RELEVANCE

There is insufficient evidence to determine the extra costs associated with or the clinical efficacy of biological mesh materials for the repair of abdominal wall hernia.

Different Goals, Different Pathways: The Role of Metacognition and Task Engagement in Surgical Skill Acquisition

BACKGROUND

The purpose of this study is to understand why learning goals and performance goals may produce different outcomes in surgical skills training for novices, with specific attention to metacognition and task engagement.

METHODS

Third-year medical students were randomized to a performance or learning-goal condition during a knot tying and suturing training program. Performance was assessed by blinded videotaped review. Demographics, goal orientation, and metacognition were captured with pre- and posttraining questionnaires.

RESULTS

A total of 90 students participated in the training program. Trainees in the learning goals group demonstrated better performance on knot tying (4.30 ± 0.78 vs 3.86 ± 0.95; p < 0.05) and suturing (4.10 ± 0.77 vs 3.54 ± 0.73; p < 0.001). Participants in the learning goals group reported higher task engagement during both knot tying (4.32 ± 0.66 vs 3.90 ± 0.52; p < 0.001) and suturing (4.48 ± 0.42 vs 4.01 ± 0.46; p < 0.001). Additionally, the learning goals group also reported higher metacognition during both knot tying (3.88 ± 0.75 vs 3.59 ± 0.52; p < 0.05) and suturing (3.96 ± 0.75 vs 3.68 ± 0.48; p < 0.05).

CONCLUSIONS

Our findings suggest that learning goals may be optimal for trainees learning new surgical tasks because they elicit increased task engagement and metacognition among trainees.

More on 'No Gut Syndrome': A case report

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Highlights the entity ‘No Gut Syndrome’ which arises as a consequence of massive small bowel resection.

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This situation is faced more often than reported in literature. We earlier reported 2 similar cases as well as a literature review.

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Life-long PN associated complications and outcomes in these patients pose a clinical dilemma.

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This report continues to assert the need to proceed with a NTE, and the successful outcomes of many patients thereafter.

Introduction

No Gut Syndrome refers to a condition which results after a near total enterectomy (NTE) has been performed. These patients are unable to sustain life without life-long parenteral nutrition (PN). Re-establishment of bowel continuity, complications, quality of life (QoL), and overall outcomes are important aspects to be considered in patients who might need a NTE. We have previously reported two similar cases as well as a literature review in patients with No Gut Syndrome. In the present report, we present an additional case and an update of the literature.

Presentation of the case

A 62-year old man with multiple co-morbidities presented with features of acute small bowel obstruction. Exploratory laparotomy revealed severe mesenteric ischemia and extensive small bowel necrosis. Patient eventually underwent a NTE and was discharged on parenteral nutrition.

Discussion

Near total enterectomy (NTE) is a clinical condition in which a patient is left without or with minimal length of small bowel along with either gastrointestinal continuity or exteriorization of the proximal end. This condition has remained a dilemma for surgeons worldwide chiefly as a result of its perceived incompatibility with life. There are only a few available options for proceeding with treatment, however maintenance on long term parenteral nutrition has shown promising results.

Conclusion

Long term parenteral nutrition serves as a viable treatment option for managing patients after a NTE.

Digital Papillary Adenocarcinoma: Presentation, Natural History and Management

Digital papillary adenocarcinoma (DPA) is a rare malignant tumor of the sweat glands that often presents as a solitary painless mass on the digits of the hands or feet. We present a rare case of DPA on the ankle in a 54 year-old African American man. Although the most common location for digital papillary adenocarcinoma is on the hands and feet, it can present in other locations. Treatment modalities and concerns such as the level of margin resection, degree of negative margins, and the need for a sentinel lymph node biopsy might be different if the tumor is encountered in locations other than the digits. In the following manuscript, we discuss the natural history of this rare tumor including a review of the current literature with emphasis on documented treatment strategies as well as the approach in treating patients with a unique presentation.

Feasibility of Subcutaneous Gentamicin and Pressurized Irrigation as Adjuvant Strategies to Reduce Surgical Site Infection in Colorectal Surgery: Results of a Pilot Study

Surgical site infections (SSIs) remain a common and costly morbidity after colorectal surgery. This rate remains high even in the setting of strict adherence to Surgical Care Improvement Project Protocols. The aim of our pilot study was to determine the feasibility and safety of subcutaneous gentamicin injection or pressurized irrigation as adjuncts to reduce SSI. A total of 132 patients who underwent colorectal surgery at the VA North Texas Health Care System were prospectively assigned to a pressurized irrigation group (n = 44), a preincision gentamicin injection group (n = 48), or control (n = 40). The primary objective was to assess safety and feasibility of these strategies. Patient demographics were matched among groups. Univariate and multivariate analyses were performed to identify possible predictions of SSI in this cohort. The rate of SSI in the control group was 25 per cent, 13.5 per cent in the pressurized irrigation group, and 12.5 per cent in the gentamicin group ( P = 0.26). Combined, the intervention groups had a 13 per cent SSI versus 25 per cent control ( P = 0.09). Operative time was not increased by the interventions and no intraoperative complications specifically related to the interventions were noted. Postoperative complications were not different between groups. Both albumin and body mass index were associated with SSI. Body mass index was and independent predictor of SSI ( P = 0.006). In conclusion, this pilot study demonstrates the feasibility of the interventions described. There was no detrimental effect of either intervention. There was trend toward a reduction in SSI in the intervention group, which warrants further investigation.

Feasibility of subcutaneous gentamicin and pressurized irrigation as adjuvant strategies to reduce surgical site infection in colorectal surgery: results of a pilot study

Surgical site infections (SSIs) remain a common and costly morbidity after colorectal surgery. This rate remains high even in the setting of strict adherence to Surgical Care Improvement Project Protocols. The aim of our pilot study was to determine the feasibility and safety of subcutaneous gentamicin injection or pressurized irrigation as adjuncts to reduce SSI. A total of 132 patients who underwent colorectal surgery at the VA North Texas Health Care System were prospectively assigned to a pressurized irrigation group (n = 44), a preincision gentamicin injection group (n = 48), or control (n = 40). The primary objective was to assess safety and feasibility of these strategies. Patient demographics were matched among groups. Univariate and multivariate analyses were performed to identify possible predictions of SSI in this cohort. The rate of SSI in the control group was 25 per cent, 13.5 per cent in the pressurized irrigation group, and 12.5 per cent in the gentamicin group (P = 0.26). Combined, the intervention groups had a 13 per cent SSI versus 25 per cent control (P = 0.09). Operative time was not increased by the interventions and no intraoperative complications specifically related to the interventions were noted. Postoperative complications were not different between groups. Both albumin and body mass index were associated with SSI. Body mass index was and independent predictor of SSI (P = 0.006). In conclusion, this pilot study demonstrates the feasibility of the interventions described. There was no detrimental effect of either intervention. There was trend toward a reduction in SSI in the intervention group, which warrants further investigation.

Phase I dose escalation trial of nitroglycerin in addition to 5-fluorouracil and radiation therapy for neoadjuvant treatment of operable rectal cancer

BACKGROUND

Nitric oxide donors decreased cell survival in vitro and tumor load in vivo in models of rectal cancer subjected to ionizing radiation. Nitroglycerin (NTG) transdermal patches, added to chemotherapy, have been shown to improve outcomes in lung cancer patients.

METHODS

This open-label, nonrandomized, multicohort, dose escalation, phase I trial had a primary endpoint to evaluate the safety, tolerability, feasibility, dose-limiting toxicity and maximum tolerated dose of topical NTG in addition to 5-fluorouracil and radiation therapy for neoadjuvant treatment of locoregionally advanced operable rectal cancer. The secondary endpoint was rate of pathologic complete response (pCR). Patients were assigned to 3 sequential cohorts of escalating dose levels of commercially available NTG patches (0.2, 0.4, and 0.6 mg/h), each cohort was intended to consist of 3 patients.

RESULTS

Thirteen patients were enrolled in the trial as specified in the dose escalation protocol. They were all male with a median age of 59.4 ± 2.5 (SEM) years. The observed toxicities were mild to moderate and manageable. Four patients developed asymptomatic grade 3 lymphopenia during the chemoradiation that resolved promptly upon completion. One patient had a non-ST segment elevation MI and 1 patient developed diarrhea. None of these toxicities were attributed to NTG except for 1 patient who developed a grade 3 headache. This required an additional group of patients at the same dose and no other patient experienced headaches. pCR was 17%.

CONCLUSION

NTG patches are well-tolerated and it is feasible to proceed with a phase II trial at the maximum dose examined (0.6 mg/h).

Genotypic characteristics of resistant tumors to pre-operative ionizing radiation in rectal cancer

Due to a wide range of clinical response in patients undergoing neo-adjuvant chemoradiation for rectal cancer it is essential to understand molecular factors that lead to the broad response observed in patients receiving the same form of treatment. Despite extensive research in this field, the exact mechanisms still remain elusive. Data raging from DNA-repair to specific molecules leading to cell survival as well as resistance to apoptosis have been investigated. Individually, or in combination, there is no single pathway that has become clinically applicable to date. In the following review, we describe the current status of various pathways that might lead to resistance to the therapeutic applications of ionizing radiation in rectal cancer.

Body weight loss with phentermine alone versus phentermine and fenfluramine with very-low-calorie diet in an outpatient obesity management program: a retrospective study

BACKGROUND

Obesity, which is epidemic in the United States, is associated with increased morbidity and mortality. The combination of diet, exercise, and a behavior-modification program often does not result in ideal body weight.

OBJECTIVE

The aim of this study was to determine the efficacy of phentermine (Phen) alone compared with phentermine plus fenfluramine (Phen-Fen), when used in combination with a very-low-calorie diet (VLCD) for weight loss in an outpatient obesity center.

METHODS

We analyzed data collected at the UCLA outpatient University Obesity Center between 1993 and 1999. Data for patients who attended the center for at least 12 weeks and at least 4 visits, who were taking Phen or Phen-Fen, and whose body mass index (BMI) was ≥30 kg/m(2) were included in this retrospective study.

RESULTS

During the study period, 3200 visits were recorded. Of 1133 potential participants, 446 patients were included in the analysis (309 women, 137 men; mean [SD] age, 46.7 [11.4] years; mean [SEM] body weight, 109.6 [26.7] kg; mean [SEM] BMI, 38.0 [7.6] kg/m(2)). Of these, 128 women and 60 men (mean [SEM] body weight at baseline, 103.4 [24.0] kg and 124.9 [28.2] kg, respectively) received Phen alone; 181 women and 77 men (mean [SEM] body weight at baseline, 102.5 [21.4] kg and 124.9 [30.2] kg, respectively) received Phen-Fen. No statistically significant differences were found between the Phen and Phen-Fen groups in mean age, body weight, or BMI for women or men at baseline. No significant differences in the time of weight loss were found when a VLCD was used with Phen alone compared with the Phen-Fen combination for either sex even at 12 weeks. For women, the mean total body weight loss was 7.4% in the Phen group and 8.7% in the Phen-Fen group, but these differences were not significant. For men, the mean total body weight loss was 7.8% in the Phen group and 8.2% in the Phen-Fen group, but these differences were not significant. No significant differences in BMI, severe adverse events, or dropout rate were found between the 2 treatment groups for men or women.

CONCLUSIONS

This outpatient study did not detect any significant difference between adjunctive uses of Phen compared with Phen-Fen pharmacotherapy when used with VLCD over 12 weeks. Phen can be used to achieve significant weight loss when combined with VLCD. The tolerability and positive physical response further suggest that Phen is a valuable medication for obesity management in the outpatient setting.

The use of imaging and biomarkers in diagnosing Barrett's esophagus and predicting the risk of neoplastic progression

Long-standing gastroesophageal reflux disease can result in transformation of the normal squamous lining of the esophagus into columnar epithelium (with goblet cells). This condition, Barrett's esophagus (BE), is considered a risk factor for esophageal cancer (EAC) and may be the cause of the increased incidence of EAC over the last few decades. Currently, endoscopy with biopsies revealing dysplasia is the best predictor for neoplastic progression in patients with BE. However, the use of more sophisticated imaging techniques and biomarkers with or without histological assessment may be helpful in more accurate prediction of malignant transformation in these patients. New approaches to the evaluation of BE such as epigenetics, miRNA analysis, detection of DNA content abnormalities and loss of heterozygosity have great potential to shed light on the complex gastroesophageal reflux disease -BE-EAC sequence.

Outcomes of emergent inguinal hernia repair in veteran octogenarians

Outcomes from emergent inguinal hernia (IH) repair in veteran octogenarians are not well described. We reviewed outcomes for this cohort from 2005 to 2012 at the VA North Texas Health Care System. There were 15 emergent (Group I) and 86 elective (Group II) operations performed in octogenarians. Age and American Society of Anesthesiologists status were similar in both groups. The rate of minor and major complications was higher in Group I compared with Group II (33 and 19% vs 22 and 2%, respectively; both Ps < 0.001). Hospital length of stay (LOS) and intensive care unit LOS were also longer in Group I compared with Group II (6.7 ± 7.0 and 2.5 ± 4.4 vs 0.8 ± 1.9 and 0.12 ± 0.6 days, respectively; both Ps < 0.001). Thirty-day mortality was 13 per cent for Group I and 0 per cent for Group II. Despite the high rate of comorbid conditions in our group, the risk associated with elective repair of IH was not prohibitive. In contrast, we observed that 15 per cent of patients presented with an incarcerated hernia during the study period and the mortality rate was 13 per cent in this cohort. Factors that might predict incarceration in veteran octogenarians need to be further investigated.

Rapid progression of a germ cell tumor encasing the inferior vena cava and aorta following a radical orchiectomy

Early stage testicular germ cell tumors are highly curable malignancies, but the need for close radiologic and biomarker surveillance is pivotal. Even in the setting of recurrence, rescue therapy has been successfully implemented. The present report describes a patient that had rapid and aggressive recurrence after radical orchiectomy for a testicular germ cell tumor and presented with bulky disease necessitating reconstruction of the inferior vena cava at the time of salvage retroperitoneal debulking.

Clostridium difficile enteritis: A report of two cases and systematic literature review

Clostridium difficile (C. difficile) is the most common cause of healthcare associated infectious diarrhea. In the last decade, the incidence of C. difficile infection has increased dramatically. The virulence of C. difficile has also increased recently with toxigenic strains developing. C. difficile is generally a disease of the colon and presents with abdominal pain and diarrhea due to colitis. However, C. difficile enteritis has been reported rarely. The initial reports suggested mortality rates as high as 66%. The incidence of C. difficile enteritis appears to be increasing in parallel to the increase in colonic infections. We present two cases of patients who had otherwise uneventful abdominal surgery but subsequently developed C. difficile enteritis. Our literature review demonstrates 81 prior cases of C. difficile enteritis described in case reports. The mortality of the disease remains high at approximately 25%. Early recognition and intervention may reduce the high mortality associated with this disease process.

Coughing-induced bowel transection in a patient with an incarcerated inguinal hernia: a case report

Introduction

Although blunt trauma to a hernia-containing bowel is known to cause bowel perforation, this report documents the first incident of a small bowel transection following a non-traumatic event.

Case presentation

We report the case of a 49-year-old African American man with a chronic incarcerated inguinal hernia awaiting elective repair. He presented to the Emergency Department with abdominal pain following an episode of coughing. On examination, he was found to have peritonitis. He underwent exploratory laparotomy, and had a complete small bowel transection. A bowel resection with primary anastomosis was performed, as well an inguinal hernia repair.

Conclusion

Chronic hernia incarceration can lead to weakening and ischemia of the bowel, and minimal trauma can lead to perforation of the weakened segment. In such presentations, bowel resection and repair of the defect with a biological material is safe and feasible.

Critical concepts in the oncogenesis of adenocarcionoma of the rectum

The current management of rectal cancer in the preoperative setting provides a unique opportunity to explore individualized patient care. The management of adenocarcinoma of the rectum must involve a multidisciplinary approach. The distinctive feature of rectal tumors to either achieve complete resolution or no response in patients submitting to the same treatment modalities demonstrates that the biology of rectal tumors requires further insights. An understanding of the biology of rectal tumors might permit for selection of patients with an aggressive phenotype allowing for alterations in the operative and neoadjuvant planning. The critical concepts in the oncogenesis of rectal cancer are areas of dynamic progression and require constant assessment.

New directions in the preoperative management of adenocarcinoma of the rectum

Pathological complete response is observed in nearly 20% of patients with rectal cancer receiving preoperative chemoradiation. Patients who achieve a pathological complete response have better outcomes compared to patients experiencing no response or partial response. Current strategies have not demonstrated a substantial improvement in augmenting the ratio of responders to partial and nonresponders. The following discussion addresses possible strategies of investigation to increase patients achieving a complete obliteration of rectal tumors following neoadjuvant chemoradio therapies.