Pathological complete response and associated factors in breast cancer after neoadjuvant chemotherapy: A retrospective study.

Objectives: This study aimed to determine clinical and pathological factors that identify a pathological complete response (pCR) in breast cancer patients undergoing neoadjuvant chemotherapy (NAC). Material and Methods: A retrospective, single-center study was conducted in women over the age of 18 who had been diagnosed with pathologically confirmed invasive breast cancer and who had received NAC between July 2016 and October 2021. Patient demographics, clinical, radiological, treatment, and pathological data were reviewed from the electronic hospital records. The primary outcome of interest was pCR, defined as the absence of residual invasive breast cancer in both the breast and axillary lymph nodes. Multivariable logistic regression analysis was used to identify factors associated with pCR. Results: A total of 119 patients were included in the analysis. The distribution of age was 54.5 ± 11.5 years. pCR was observed in 33 (27.7%) patients. pCR for breast tissue was observed in 43 (36.1%) patients. There was no statistically significant relation between the clinical stage and pCR. Age, age at first labor, extent of disease in the breast, NAC completeness, clinical tumor size (cT) stage, clinical lymph node (cN) stage, and molecular subtype were analyzed in a multivariable model. Analysis showed that molecular subtype was the only independent factor related to pCR. pCR rates across molecular subtypes were: 8.7% in luminal-A, 10.8% in luminal-B, 54.5% in human epidermal growth factor receptor 2 (HER-2)-positive, 42.4% in luminal-B (HER-2 positive) and 46.7% in triple-negative. There was no statistically significant difference between luminal-A and luminal-B subgroups (odds ratio 1.15, 95% confidence interval, 0.19-9.35, p= 0.881). Despite the limited number of patients in HER2-positive and triple-negative groups, both demonstrated statistically significant higher odds compared to reference group. Conclusion: The presented study underscores the relevance of molecular subtypes in determining the response to neoadjuvant chemotherapy in breast cancer patients. Particularly HER2-positive and triple-negative subtypes may demonstrate more favorable response rates.

Does surgeon specialization add value to surgeon volume in gastric cancer surgery?

BACKGROUND: This study aimed to assess the combined impact of surgeon specialization and surgeon volume on both short- and long-term outcomes in patients underwent curative gastrectomy for gastric cancer. METHODS: Patients with cStage1-3 gastric adenocarcinoma who underwent curative-intent surgery between January 2010 and December 2020 were evaluated. The impact of surgeon specialization and surgeon volume on clinical outcomes was scrutinized, both individually and in combination. For the purpose of assessing the combined effect, surgeons were classified into three groups: Non-specialized low-volume (NS-low), non-specialized high-volume (NS-high), and specialized high-volume (S-high). Postoperative outcomes and survival were evaluated. The adjusted effect sizes were expressed as odds ratio (OR) or hazard ratio (HR) with the corresponding 95% confidence interval. RESULTS: Total of 537 patients operated by twelve surgeons were included in the analysis. For all cohort, the 30d-, in-hospital and 90d-mortality were 3.5%, 3%, and 6.3%, respectively. High surgeon volume alone had a significant impact (OR: 0.31 [0.10-0.82, p = 0.023]) on 30-day mortality. However, upon evaluating the combined effects of the parameters, while the most favorable 30-day mortality rate was observed in the S-high group, neither the NS-low group (OR: 3.82 [1.10-18.17, p = 0.054]) nor the NS-high group (OR: 1.37 [0.23-8.37, p = 0.724]) demonstrated a statistically significant difference when compared to the S-high group. The NS-low group showed poor results for several types of postoperative outcomes. In terms of overall survival, the S-high group outperformed, while the NS-low and NS-high groups presented with notably worse outcomes (HRs: 2.04 [1.51-2.75, p < 0.001], and 1.75 [1.25-2.44, p = 0.001], respectively). CONCLUSION: The primary factor influencing short-term outcomes for patients who underwent gastric cancer surgery was found to be surgeon volume, while specialization provided a limited additional value. However, specialization emerges as an independent factor with a greater contribution to long-term survival than the impact attributed to high-volume.

The relationship between albumin-bilirubin score and survival in patients operated for pancreatic cancer.

Objective: To investigate whether albumin-bilirubin score can be used as a prognostic marker in pancreatic cancer patients post-surgery. METHODS: The retrospective study was conducted at the Medical Oncology Clinic, Karadeniz Technical University, Trabzon, Turkey, and comprised data from 2010 to 2018 of pancreatic cancer patients who had undergone distal pancreatectomy or pancreaticoduodenectomy and were followed up for 3 years. Preoperative and postoperative serum albumin, carcinoembryonic antigen, carbohydrate antigen 19-9, bilirubin, neutrophil:lymphocyte ratio and platelet:lymphocyte ratio were compared as inflammation markers, while albumin-bilirubin scores were calculated using the equation linear predictor. Data was analysed using SPSS 17. RESULTS: Of the 39 patients, 23(59%) were men and 16(41%) were women. The mean age of the sample was 62.4±10.2 years. No statistically significant changes were observed between preoperative and postoperative albumin-bilirubin scores, carcinoembryonic antigen, neutrophil:lymphocyte ratio and platelet:lymphocyte ratio (p>0.05). Significant decreases were observed in postoperative carbohydrate antigen 19-9, aspartate transaminase and alanine transaminas levels (respectively<0.05). No significant change was determined in postoperative albumin-bilirubin grade distributions compared to preoperative values (p=0.180). Although the rate of recurrence increased in line with preoperative albumin-bilirubin scores, the finding was not statistically significant (p=0.055). Mortality rate increased significantly in line with preoperative albumin-bilirubin scores (p=0.013). CONCLUSIONS: The albumin-bilirubin score affected survival in patients with pancreatic cancer, and can be employed as a prognostic factor in this patient group.

Effects of Sarcopenia on Postoperative Outcomes in Patients Who Underwent Gastrectomy for Gastric Cancer.

BACKGROUND: The relationship between sarcopenia and postoperative outcomes in patients with gastric cancer remains controversial. This study aimed to investigate the impact of sarcopenia on short-term outcomes after surgery for gastric cancer. METHODS: Patients who underwent surgical treatment for gastric cancer were evaluated in this prospective observational study. Muscle strength, muscle mass, and physical performance were measured before surgery. Diagnosis of sarcopenia was based on the revised European Working Group on Sarcopenia criteria. Postoperative 30-day outcomes, including complications, reoperation, readmission, and operative mortality, were recorded. RESULTS: Sarcopenia was observed in 31 out of 146 patients (21.2%). The overall complication incidence was 31.5%. The postoperative complication rate was higher in the sarcopenic patients compared to the nonsarcopenic patients (54.8% versus 25.2%, P = 0.003). There was no statistically significant difference in terms of surgical complication rates (25.8% versus 14.8%, P = 0.239), although the sarcopenic group had a significantly higher systemic complication rate (38.7% versus 13%, P = 0.003). No statistically significant difference was observed in terms of major complications (3.2% versus 5.2%, P = 1.000). Muscle strength, muscle mass, and physical performance were not identified as independent factors when tested alone at adjusted multivariable analysis. Sarcopenia (Odds ratio: 2.73, 95% CI 1.02-7.52, P = 0.047) and severe sarcopenia (Odds ratio: 4.44, 95% CI 1.57-13.34, P = 0.006) were identified as independent prognostic factors for postoperative complications. CONCLUSIONS: Sarcopenia was associated with postoperative complications after gastrectomy for gastric cancer. Severe sarcopenia may serve as a more robust prognostic indicator. The variation in the complication rates between sarcopenic and nonsarcopenic patients was mainly due to difference in systemic complications rather than surgical complications.

The Diagnostic Value of ischemia-modified albumin (IMA) and signal peptide-CUB-EGF domain-containing protein-1 (SCUBE-1) in an Experimental Model of Strangulated Mechanical Bowel Obstruction.

BACKGROUND: Mechanical bowel obstruction (MBO) is one of the principal pathologies requiring emergency surgery and a significant worldwide cause of morbidity. The identification of patients in whom bowel obstruction resolves spontaneously is important in terms of preventing unnecessary surgical interventions and future potential adhesions. The decision-making process is difficult in patients presenting without classic examination findings. METHODS: 36 female Sprague-Dawley rats randomly divided into six experimental groups. In Group 1, 3 and 5, laparotomy was performed, with blood and tissue specimens being collected after 1, 2 and 6 h, respectively. In Group 2, 4 and 6, the ileum segment was ligated following laparotomy, and blood and tissue specimens were collected after 1, 2 and 6 h, respectively. The ileum specimens were examined macroscopically, after which 1-cm sections were taken and examined in terms of histopathological changes. IMA and SCUBE-1 levels were determined for each group, and macro- and microscopic tissue examination findings were compared between the groups. RESULTS: Comparison within the groups exposed to waiting times of 1 h (groups 1 and 2), 2 h (groups 3 and 4) and 6 h (groups 5 and 6) revealed higher mean IMA and SCUBE-1 levels in rats undergoing ligation together with incision (groups 2, 4, and 6) compared to those undergoing laparotomy only (groups 1, 3, and 5). Correlation analysis was applied to determine the relationship between total scores obtained from histopathological examination and IMA and SCUBE-1 values. The analysis revealed strong, significant and positive correlation between histopathological examination scores and IMA (r=0.643, p=0.000) and SCUBE-1 (r=0.509, p=0.002) values. CONCLUSION: The study findings showed that both IMA and SCUBE-1 values increased in a strangulated MBO model in rats. We think that IMA and SCUBE-1 values can be used as a markers of damage in the early period in strangulated MBO, and that the patient's surgery requirement can thus be determined in the early period.

Ischemia-modified albumin and the IMA/albumin ratio in the diagnosis and staging of hemorrhagic shock: A randomized controlled experimental study.

BACKGROUND: To determine the value of ischemia-modified albumin (IMA) and IMA/albumin ratio (IMAR) in the diagnosis and staging of hemorrhagic shock (HS). METHODS: A pressure-targeted HS model was established in this study. The control and shock groups were monitored for 30 min and 60 min to simulate varying durations of exposure to HS. All subjects underwent invasive arterial monitoring during the experiment and were further divided into mild and severe shock groups based on decreases in mean arterial pressure (MAP). Biochemical and histologic comparisons were performed between the groups. RESULTS: Our results revealed higher IMA, IMAR, lactate, total oxidant status (TOS) and oxidative stress index (OSI) levels in both the 30- and 60-min shock groups compared to the control group. Concerning MAP-based shock staging, IMA, IMAR, lactate, TOS and OSI levels in the 30-min and 60-min mild and severe shock groups were higher than those of the controls. However, there was no significant difference between the mild and severe shock groups. A significant correlation was determined between all the biomarkers evaluated and HS-induced damage in various organs. This correlation was highest in lactate and IMAR levels. CONCLUSION: IMA and IMAR levels may be used in the early diagnosis of HS and also have the potential for use in determining the severity of HS. IMA and IMAR measurement may also be considered as an alternative or in addition to lactate measurement in the diagnosis of HS.

The effect of Liv-52 on liver ischemia reperfusion damage in rats.

BACKGROUND: Liver ischemia reperfusion (I/R) damage which is frequently seen in clinical hepatobiliary surgeries has no effective treatment for it. Liv-52, known to have hepatoprotective effects, is a natural antioxidant drug licensed by the Ministry of Health of India. The aim of our study is to investigate the effect of Liv-52 on liver damage induced by I/R in rats. METHODS: Albino Wistar male rats were divided into three groups; liver I/R (IR), 20 mg/kg Liv-52 + liver ischemia reperfusion (LIR) and sham operation applied to control group (HG). Liv-52 was administered to the LIR group (n = 6) 1 h prior to I/R application and distilled water was given orally to IR (n = 6) and HG (n = 6) groups as a solvent. Ischemia was determined as 1 h, and reperfusion was identified as 6 h in animals. RESULTS: Increased levels of alanine aminotransferase, aspartate aminotransferase and lactate dehydrogenase, malondialdehyde, myeloperoxidase, and decreased levels of superoxide dismutase, and glutathione related enzymes caused by I/R application have been converged to healthy group level with Liv-52 treatment and the damage in liver tissue has been improved histopathologically. CONCLUSIONS: Liv-52 may be beneficial for preventing liver I/R damage in pre-surgery application.

The effect of metyrosine on oxidative gastric damage induced by ischemia/reperfusion in rats. Biochemical and histopathological evaluation

Abstract Purpose: To investigate the effect of metyrosine against I/R induced gastric damage in rats. Methods: Eighteen albino Wistar male rats were divided into groups; gastric I/R (GIR), 50 mg/kg metyrosine+gastric I/R (MGIR), and sham (SG) groups. 50 mg/kg metyrosine was given to the MGIR group, and distilled water was given to the GIR and SG groups by the oral gavage. After 30 minutes, 25 mg/kg thiopental sodium was injected intraperitoneally. Ischemia was achieved for 1 hour by clamping the celiac artery of the MGIR and GIR groups, then reperfusion was achieved for 3 hours. After that, animals were killed with 50 mg/kg thiopental. Biochemical and histopathological examinations performed on the gastric tissues. Results: Metyrosine decreased the MDA and MPO and the increased the tGSH and SOD. In addition, it reduced inflammation by suppressing the decrease of COX-1 and the increase of COX-2. Histopathologically, metyrosine decreased symptoms caused by I/R such as mucosal necrosis, hemorrhage, edema, PMNL infiltration, and dilated congested blood vessels. Conclusions: Metyrosine prevented the I/R induced oxidative stress in the gastric tissue. Metyrosine may be beneficial for gastric I/R injury.

N-acetylcysteine amid reduces pancreatic damage in a rat model of acute necrotizing pancreatitis.

BACKGROUND: Inflammatory explosion and oxidative stress are important mechanisms of injury in acute necrotizing pancreatitis (ANP). This study investigated the effects of N-acetylcysteine amid (NACA), a novel cell-permeant antioxidant with anti-inflammatory activity, on experimental ANP in rats. MATERIALS AND METHODS: Fifty-two adult male Sprague-Dawley rats were used, and ANP was induced by cerulein. The animals were divided into four groups which were sham + saline, sham + NACA, ANP + saline, and ANP + NACA. NACA (2.2 mg/kg, i.p) was administered for 6 h, after the induction of ANP. The extent of acinar cell injury, mortality, systemic cardiorespiratory variables, functional capillary density, renal/hepatic functions, and changes in some enzyme markers for pancreas and lung tissues were investigated. RESULTS: Induction of ANP increased mortality from 0% in the sham group to 43.75% in the ANP + saline group (P < 0.05), and administration of NACA significantly reduced mortality to 12.5% (P < 0.05). Induction of ANP also caused increases in pancreatic necrosis, serum amylase, alanine aminotransferase (ALT), interleukin-6, LDH in bronchoalveolar lavage fluid, serum urea, tissue myeloperoxidase in pancreas and lung tissues and malondialdehyde. There was less pronounced increase in these parameters in NACA treated group. Compared with ANP group, ANP + NACA group had lower levels of pancreatic necrosis (0.5 ± 0.2 versus 1.45 ± 0.2, P < 0.05) and inflammation (0.6 ± 0.2 versus 1.29 ± 00.3, P < 0.05) scores. CONCLUSIONS: Administration of NACA significantly decreased the ANP-induced mortality and also provided significant improvements in hemodynamic changes. The obtained positive effects of NACA on the course of pancreatitis indicates its potential usefulness in the management of ANP.

Effects of clotrimazol on the acute necrotizing pancreatitis in rats.

This study aims to investigate the influence of clotrimazol (CLTZ) on acute necrotizing pancreatitis (ANP) induced by glycodeoxycholic acid in rats. Rats were divided into five groups as sham + saline, sham + CLTZ, sham + polyethylene glycol, ANP + saline, and ANP + CLTZ. ANP in rats was induced by glycodeoxycholic acid. The extent of acinar cell injury, mortality, systemic cardiorespiratory variables, functional capillary density (FCD), renal/hepatic functions, and changes in some enzyme markers for pancreatic and lung tissue were investigated during ANP in rats. The use of CLTZ after the induction of ANP resulted in a significant decrease in the mortality rate, pancreatic necrosis, and serum activity of amylase, alanine aminotransferase, interleukin-6, lactate dehydrogenase in bronchoalveolar lavage fluid, serum concentration of urea, and tissue activity of myeloperoxidase, and malondialdehyde in the pancreas and lung and a significant increase in concentrations of calcium, blood pressure, urine output, pO2, and FCD. This study showed that CLTZ demonstrated beneficial effect on the course of ANP in rats. Therefore, it may be used in the treatment of acute pancreatitis.

Detailed dissection of hepato-caval junction and suprarenal inferior vena cava.

BACKGROUND/AIMS: There are few anatomical studies on hepatic vein compared to hepatic artery and portal vein. The aim of this study is to clarify the branching patterns of hepatic veins, supra and infra-diaphragmatic course of suprarenal inferior vena cava and its relation with the liver. METHODOLOGY: Between March and May 2008, 103 consecutive autopsy examinations were included in the study. Hepatic vein anatomy was classified according to the Broelsch classification. The anatomic relations of supra-diaphragmatic and infra-diaphragmatic (suprarenal) inferior vena cava were revealed. RESULTS: Majority of subjects have Type a (42.7%) variation. The inferior right hepatic vein was presented alone in 26 and together with middle right hepatic vein in 15 subjects. Most of the phrenic veins were drained to the right-anterior sidewall of inferior vena cava (n=21/25 above the diaphragm and, n=144/306 below the diaphragm). Drainage of the right adrenal vein directly into the right side of the inferior vena cava was found in 82 subjects (80%). Most of subjects had 2 lumbar branches in the posterior sidewall of infradiaphragmatic inferior vena cava (n=92/103). CONCLUSIONS: The proposed classification of hepatic veins and obtained anatomical details from this study provides useful assistance for hepatic surgeons in phases of operative planning and vascular control maneuvers required in liver surgery.