Surgical Margins Research Articles

Prospective observational non-randomized trial protocol for surgical planner 3D image processing & reconstruction for locally advanced colon cancer

IntroductionColon cancer presents significant surgical challenges that necessitate the development of precise strategies. Standardization with complete mesocolic excision (CME) is common, but some cases require extended resections. This study investigates the use of 3D Image Processing and Reconstruction (3D-IPR) to improve diagnostic accuracy in locally advanced colon cancer (LACC) with suspected infiltration and achieve R0 surgery.MethodsSingle-center, prospective, observational, comparative, non-randomized study.•Participants: Patients aged > 18 years undergoing LACC surgery, as indicated by CT scans, confirmed via colonoscopy. Exclusion criteria include neoadjuvant therapy, suspected carcinomatosis on CT, and unresectable tumors.•Interventions: 3D-IPR models are used for surgical planning, providing detailed tumor and surrounding structure metrics. Surgical procedures are guided by CT scans and intraoperative findings, categorized by surgical margins as R0, R1, or R2.•Objective: The primary goal is to evaluate 3D-IPR’s utility in achieving R0 resection in LACC with suspected infiltration. Secondary objectives include assessing preoperative surgical strategy, comparing CT reports, detecting adenopathy, and identifying vascularization and anatomical variants.• Outcome: The main outcome is the diagnostic accuracy of 3D-IPR in determining tumor infiltration of neighboring structures compared to conventional CT scans, using definitive pathological reports as the gold standard.Results•Recruitment and Number Analyzed: The study aims to recruit about 20 patients annually over two years, focusing on preoperative 3D-IPR analysis and subsequent surgical procedures.•Outcome Parameters: These include loco-regional and distant recurrence rates, peritoneal carcinomatosis, disease-free and overall survival, and mortality due to oncologic progression.•Harms: No additional risks from CT scans, as they are mandatory for staging colon tumors. 3D-IPR is derived from these CT scans.DiscussionIf successful, this study could provide an objective tool for precise tumor extension delimitation, aiding decision-making for radiologists, surgeons, and multidisciplinary teams. Enhanced staging through 3D-IPR may influence therapeutic strategies, reduce postsurgical complications, and improve the quality of life of patients with LACC.Trial registrationTrial is registered at ISRCTN registry as ISRCTN81005215. Protocol version I (Date 29/06/2023).

Residual diabetic foot osteomyelitis after surgery leads to poor clinical outcomes: A systematic review and meta-analysis.

The aim of this meta-analysis is to compare the clinical outcomes in patients with and without residual osteomyelitis (ROM) after surgical bone resection for diabetic foot osteomyelitis (DFO). We completed a systematic literature search using PubMed, Scopus, and Embase using keywords DFO, Residual OM (ROM), and positive bone margins. The study outcomes included wound healing, antibiotic duration, amputation, and re-infection. Five hundred and thirty patients were included in the analysis; 319 had no residual osteomyelitis (NROM), and 211 had ROM. There was not a significant difference in the proportion of wounds that healed 0.6 (p = 0.1, 95% confidence intervals [95% CI] 0.3-1.3). The risk of infection was 2.0 times higher (OR = 2.0, p = 0.02, 95% CI 1.1-3.4), and the risk of amputation was 4.3 times higher (OR = 4.3, p = 0.0001, 95% CI 2.4-7.6) in patients with ROM. Patients with ROM received antibiotics significantly longer. The mean difference was 16.3 days (p = 0.02, 95% CI 11.1-21.1).

Resección pancreática por cáncer de células renales metastásico: experiencia de un hospital mexicano de alto volumen

Objective: The aim of our study was to report the oncological and surgical outcomes of the pancreatic resections due to solitary pancreatic metastasis of RCC in a tertiary care reference center for pancreatic masses in Mexico. Materials y methods: All pancreatic resections at our Institution from 2002 to 2022 were retrospectively analyzed. We only included patients treated with pancreatic resections due to metastatic RCC to the pancreas. We evaluated symptoms, time from nephrectomy to pancreatic resection, type of surgery, complications and oncological outcomes. Results: Eight pancreatic resections due to solitary metastases of RCC were performed. The median age of presentation was 69 years. The most prevalent symptom was abdominal pain (50 %). 6 pancreatoduodenectomies (Whipple procedure), 1 distal pancreatectomy and 1 total pancreatomy were done. The median time between radical nephrectomy and pancreatic resection was 122 months (8-247 months). Seven had negative surgical margins. The median follow-up time after pancreatic surgery was 42 months (1-109 months). The only case that died had pulmonary metastases and the resection was R1. Originality and value: Original study demonstrating the survival outcomes of pancreatic resection for metastatic renal cell carcinoma in a high-volume hospital in Mexico. Limitations: Retrospective study and the limited number of cases. Conclusions: Pancreatic resections due to solitary metastases from CCR could offer some advantages on survival, as long as they are done in high volume centers.

12210 Prognostic Determinants of Aggressive Histology Papillary Thyroid Carcinoma: A Pathway to Personalized Treatment

Abstract Disclosure: M. Almaghrabi: None. G. Sindi: None. H. Sasseville: None. S. Radi: None. M. Tamilia: None. Background: Papillary thyroid carcinoma (PTC), the most common form of thyroid malignancy, generally presents with a favorable prognosis. However, aggressive variants of Papillary Thyroid Carcinoma (AV-PTC), such as tall cell, hobnail, columnar, and solid forms, pose significant challenges in prognosis and treatment, due to their unique pathological behaviors and increased risks of recurrence and mortality. The management debate for AV-PTC without invasive characteristics is ongoing. It's argued that aggressive histology alone should not dictate the clinical management of PTC patients lacking aggressive features. Objectives: This study aims to investigate the prognostic impact of invasive features in AV-PTC and their implications on clinical outcomes. Methods: We conducted a retrospective cohort study of AV-PTC patients treated from 2008 to 2022, analyzing medical records to identify prognostic factors related to disease recurrence, persistence, and overall survival. This involved distinguishing between groups with invasive characteristics—identified as one of the following: extrathyroidal extension, lymphovascular invasion, the presence of positive lymph nodes, or the detection of distant metastases upon diagnosis, and non-invasive AV-PTC groups. Results: Key findings from our comparison between invasive and non-invasive groups of AV-PTC highlighted significant factors associated with poorer outcomes in the invasive group. These included multifocality (P=0.001), larger tumor size (P=0.047), extra thyroid extension (P=0.002), lymph vascular invasion (P<0.001), the presence of contralateral nodules (P=0.018), and positive surgical margins (P=0.003). Moreover, advanced tumor stage and increased lymph node involvement were more common in invasive cases (P=0.012, P=0.040). Despite no significant differences in genetic mutations between groups (P=0.396), the Ki-67 index was numerically higher in the invasive group. Hemithyroidectomy followed by completion thyroidectomy, performed in 12 patients (22.2%). Survival analysis further highlighted the significance of these invasive features, with Kaplan-Meier curves indicating a 5-year freedom from recurrence rate of 77.18% and a 10-year rate of 68.61%. Univariable Cox regression revealed that the tumor size, positive margins, and tumor stage predicted recurrence. Seven patients had distant metastasis, and all were in the invasion group (18.92%) p= 0.088. Conclusion: Our study emphasizes the critical role of certain invasive features in determining the prognosis of AV-PTC. The adoption of more extensive treatments for patients without invasive features highlights the complexity of treating AV-PTC and the importance of personalized treatment plans. This research advances our understanding of AV-PTC, advocating for individualized approaches to enhance patient outcomes. Presentation: 6/3/2024

8207 Insights From a Case of Insulinoma and Possible Genetic Variants in a Young Woman With Recurrent Hypoglycemia

Abstract Disclosure: M.A. Brandao: None. A. Bharara: None. V.I. Moncada Castro: None. T.C. Tsai: None. Y. Wu: None. S. Marquez Flores: None. K. Divari: None. Introduction: Insulinomas are neuroendocrine neoplasms causing hyperinsulinemic hypoglycemia. They are rare, with a prevalence of 1-4 people per million of the general population. Key features are symptoms of hypoglycemia, low plasma glucose, and symptom relief by correcting hypoglycemia. Here, we report a patient with recurrent hypoglycemia who was found to have insulinoma. Several variants of uncertain significance (VUS) were detected in this patient. This gives us some insights into a broader perspective. Clinical case: A 28-year-old healthy female was found unresponsive by her partner. Blood glucose (BG) was 40 mg/dL when paramedics arrived. She received dextrose and rapidly recovered. She was briefly hospitalized and received glucose infusion with improvement. Subsequently, the patient developed episodes of blurry vision and weakness. She had been eating more frequently to prevent symptoms. Her weight was stable at 65.77 kg. She had not been on any medications. She continued to experience hypoglycemic episodes with BG dropping to 30 mg/dL, so she sought evaluation from an endocrinologist. Laboratory work-up showed Proinsulin of 530.6 pmol/L, C-peptide 5 ng/ml, TSH 1.01 mciu/ml, Beta-hydroxybutyrate (BHOB) 0.7 mg/dL, hemoglobin A1c 4.7%, calcium 8.9 mg/dL, albumin 4.1. Abdominal computed tomography (CT) scan showed an 11 mm nodule anterior to the pancreatic tail. No discrete calcification was noted. Magnetic resonance imaging (MRI) of the abdomen redemonstrated the 10 x 6mm, slightly exophytic lesion in the pancreatic tail. Therefore, she underwent laparoscopic enucleation with pathology showing a 1.7cm well-differentiated grade 2 neuroendocrine tumor, with positive margins. Given its indolent nature, further surgical resection was not recommended. Germline testing showed several VUS: the AXIN2 gene (c.1822C>G), GPC3 gene (c.565G>T), NF2 gene (c.296A>G), RECQL4 gene (c.2791C>G). However, no pathogenic variants were identified. Surveillance MRI of the abdomen six months after the surgery has shown no evidence of recurrent disease. The patient has remained euglycemic and symptoms have not recurred. Conclusion: Insulinomas are typically sporadic but may occur due to an activating T372R mutation in the Yin Yang. It may also occur in the setting of multiple endocrine neoplasia type 1 (MEN-1) syndrome caused by MEN1 gene mutations. Although no pathogenic variant mutations associated with insulinoma were found, several VUS that have not yet been described as related to insulinoma were detected in this patient. Routine genetic testing in newly diagnosed patients is not always recommended. Therefore, further efforts are required to understand genetic mutations and epigenetic modifiers associated with insulinoma. Validation of identified VUS and additional genetic testing in young patients with insulinoma are crucial. Presentation: 6/2/2024

8788 Implications of NTRK gene fusion in Papillary thyroid cancer

Abstract Disclosure: W. Medina-Torres: None. L. El Musa Penna: None. J. Segarra-Villafane: None. L.R. Sepulveda-Garcia: None. Z. Maisonet -Feliciano: None. I.C. Arroyo: None. M. Ramirez: None. M. Alvarado: None. L.A. Gonzalez-Rodriguez: None. V.J. Carlo: None. Thyroid cancer (TC) is the most common endocrine cancer. Papillary thyroid carcinoma (PTC) is the predominant contributor of this occurrence, comprising approximately 80% of all thyroid carcinomas. PTC has a good prognosis with a 5-year survival rate of more than 90% after resection. Nonetheless, factors such as tumor size, multifocality, nodal and distant metastases, characterize more aggressive cases including tall cell variant, columnar cell variant, and hobnail variant Aside from staging parameters, PTC behavior is mostly determined by morphologic variant. This is the case of 31 y/o female without known past medical history who was evaluated at endocrinology clinic due to a fine needle thyroid aspiration (FNA) positive for PTC, tall cell variant. Total thyroidectomy with central compartment dissection was performed. Pathology report presented a main tumoral mass of 3 cm but permeating multinodular pattern involving the entire gland with focal extrathyroidal extension, positive margins and six level VI positive lymph nodes. As per report, the tumor presented both papillary and follicular patterns of growth and other findings including oncocytic change, foci of clear cell change, low mitotic rate, and most notably "reverse polarization”. This pattern has the pathological features suggestive of the novel NTRK gene fusion mutation. The patient was treated with radioactive iodine (RAI) and one year post treatment there was evidence of elevated Thyroglobulin level at 904 ng/mLand thyroglobulin Ab at 2.48 IU/mL. A WBS +SPECT was done resulting in small uptake at left posterior thyroid bed and pulmonary intake. A chest CT revealed multiple bilateral sub centimeter nodules. Based on this result, a second course of RAI was given. Follow up neck ultrasound and chest CT presented persistent left level VI lymph nodes, increased amount of bilateral sub-centimeter pulmonary nodules and new thoracic(T11) lesion. FNA of left neck lymph nodes were positive for metastatic PTC for which left neck dissection was performed. Evaluation for actionable somatic mutations was requested based on resistance behavior, remarkable for TRIM33-NTRK1 chromosomal rearrangement. Patient was evaluated by Oncology service who started Larotrectinib treatment since it was approved for NTRK driven malignancies. Six-month post therapy patient achieved clinical and biochemical improvement. In the thyroid, NTRK-driven malignancies are rare and aggressive but treatable, in the evolving genomic era. As reviewed in the literature, NTRK fusion-positive TC exhibits distinctive clinicopathological features that could aid in identifying potential patients. Thus, in such patients who have PTC with non-classic pathologic patterns, specific molecular profile of the main tumor may have significant prognostic value that must be integrated into stratification system in order to provide target therapy on time. Presentation: 6/3/2024

7147 A Retrospective Evaluation of Biochemical and Clinical Criteria of Permanent Hypoparathyroidism After Total Thyroidectomy and Their Associated Outcomes

Abstract Disclosure: D.G. Su: None. S. Tsou: None. W. Shen: None. Q. Duh: None. C. Graves: None. I. Suh: None. Background: Postoperative hypoparathyroidism (hypoPT) is the most common complication of total thyroidectomy and carries long-term morbidity. However, reported incidences vary widely due to nonstandardized measurement practices and absence of a universally accepted definition. This study aims to evaluate various definitions of hypoPT and to identify influencing factors such as diagnosis and operative duration. Methods: We performed a retrospective analysis of patients with a diagnosis of hypoPT (ICD-9: E20, E20.0, E20.8, E20.9, E89.2) between January 2012 and January 2019 at a single large academic institution, and only included those who had underwent a total thyroidectomy six months prior. Definitions based on low parathyroid hormone (PTH) values (PTH < 10 pg/mL), low calcium levels (corrected calcium [Ca] < 8.5 mg/dL or ionized Ca [iCa] < 1.1 mmol/L), and postoperative supplementation (elemental calcium or vitamin D) were evaluated at 6 and 12 months postoperatively. Postoperative hypocalcemic symptoms were graded by disease severity (based on the presence of numbness/paresthesia, muscle spasms/aches, and Chvostek/Trousseau signs). Patient demographics, operative and pathological characteristics, and use of parathyroid autotransplantation were recorded. Results: Of 879 patients with hypoPT ICD-9 diagnoses, 124 (14%) underwent a total thyroidectomy and were included. Our cohort was 64% female with a median age of 52.9 years. Fifty-one patients (41%) had low PTH levels, 49 (39%) had low calcium levels, and only 26 (21%) had both low PTH and calcium. Of 94 patients (76%) with hypocalcemic symptoms, 68 (73%) required long-term calcium or vitamin D supplementation. Twenty-eight (22.6%) patients had either an ED visit or readmission for hypocalcemia postoperatively. One hundred seven patients (86%) had a pathologic diagnosis of malignancy, of which 37% had extrathyroidal extension, 25% vascular invasion, and 36% positive margins. Those who underwent parathyroid autotransplantation (33%) were less likely to meet biochemical definition of hypoPT (p = 0.0312). Dosage of calcium/vitamin D supplementation did not correlate with symptom grade. Conclusions: Postoperative hypocalcemic symptoms and long-term calcium/vitamin D supplementation were the most common characteristics found in our permanent hypoPT cohort. However, substantial heterogeneity in defining postoperative hypoPT exists, with no definition capturing the full spectrum of affected patients. Further research is necessary to develop reliable diagnostic criteria or biomarkers for hypoPT prediction and management. Presentation: 6/2/2024

7305 Pheochromocytoma Presenting With Resistant Hyperglycemia

Abstract Disclosure: M. Economou: None. A. Devine: None. Background: Pheochromocytoma is a rare catecholamine producing tumor arising from the adrenal gland. Impaired glucose tolerance is a well-recognized hormonal and metabolic manifestation of pheochromocytoma caused by catecholamine excess [1]. Insulin resistance requiring very high doses of insulin in association with pheochromocytoma is, however, rare. Here we report a case of pheochromocytoma in a woman with diabetes mellitus that proved difficult to control despite high-dose insulin therapy. Case presentation: A 72-year-old woman with a longstanding history of type 2 diabetes mellitus, uncontrolled hypertension, hyperlipidemia and CVA presented to the hospital after she was found to have a hemoglobin of 7.0 ng/mL on routine labs. Notably, over the past 4 years, her insulin requirement gradually increased from 20 units/day to 50 units/day despite an A1c level of 6.1%. On presentation, our patient was hypertensive to 170/90 with limited response to multiple antihypertensive medications. Additionally, her glucose was severely uncontrolled, fluctuating between 200-500 mg/dL. Within days, the patient’s total daily insulin requirement increased tremendously to as much as 300 units/day. As part of her anemia workup, she underwent a contrast-enhanced CT abdomen & pelvis which identified a left adrenal mass measuring 2.2 x 2.8 x 2.9 cm. Further evaluation with MRI confirmed an adrenal mass suspicious for pheochromocytoma. Evaluation of plasma hormone levels revealed an elevated normetanephrine level of 7.10 nmol/L (normal: less than 0.89 nmol/L). Furthermore, the 24-h urinary normetanephrine level and chromogranin A levels were elevated to 145 mcg/day and 1203 ng/mL, respectively. Initial treatment with alpha and beta blockade improved blood pressure but glucose levels remained persistently elevated. The patient underwent left laparoscopic adrenalectomy and pathology revealed pheochromocytoma, measuring, 3.2 cm in diameter, with stains positive for CD56, synaptophysin and chromogranin. Surgical resection margins were negative for tumor. Postoperatively, insulin requirements returned to roughly that of her baseline, 40 units/day. Conclusion: Impaired glucose tolerance is a known phenomenon associated with pheochromocytoma. Despite this, it is unusual to see an insulin requirement rise as abruptly and drastically as seen in this case. Our patient, with relatively controlled diabetes had an enormous increase in her insulin requirement during her hospital course as evidenced by her insulin regimen which increased sixfold. This case highlights the importance of maintaining a high degree of suspicion for pheochromocytoma in patients with a sudden rise in insulin requirement and uncontrolled hypertension. Reference: (1) Ronen JA, Gavin M, Ruppert MD, Peiris AN. Glycemic Disturbances in Pheochromocytoma and Paraganglioma. Cureus. 2019 Apr 27;11(4): e4551. Presentation: 6/3/2024

12556 Medullary Thyroid Cancer With Persistent Elevation Of Carcinoembryonic Antigen: Case Report

Abstract Disclosure: M.S. Campana: None. Introduction: Medullary thyroid Cancer (MTC) is a rare neuroendocrine tumor that originates from thyroid parafollicular C-cells and represents 5 % of all thyroid cancers. MTC can be sporadic (75%) or hereditary (25%) associated with multiple endocrine neoplasia type 2 syndrome (MEN2). Serum calcitonin (Ctn) and carcinoembryonic antigen (CEA) are its tumor markers. We report a case of persistently elevated CEA levels despite an undetectable Ctn in a patient with MTC after initial thyroid lobectomy. Description of the case: A 42-year-old woman self-identified a neck lump after intentional weight loss. A neck US showed a right lobe thyroid nodule which resulted as suspicious for malignancy (Bethesda V) with subsequent right lobectomy. Pathology reported a 2.6 cm unexpected MTC with negative surgical margins, extrathyroidal extension, angioinvasion, and lymphatic invasion. No cervical lymph nodes (LNs) were removed. Immunohistochemistry was positive for CEA, chromogranin A, synaptophysin, and Ctn. T2 Nx. One month after lobectomy, the Ctn was 10.5 (0-3.0 pg/mL) and CEA 205.2 (0-3.0 ng/mL Non-smoker; 0-5.0 ng/mL smoker). The patient was then referred to our clinic for further management. Laboratories showed normal serum calcium, PTH, and fractionated plasma metanephrine/normetanephrine. A 2-month post-operative Ctn was undetectable, but CEA was elevated at 24.5. Subsequently, we broaden imaging studies to include neck US, CT neck /chest with contrast, and MRI abdomen pelvis with contrast. The only remarkable finding was a 6.7 cm pelvic mass with normal Ca-125. Genetic testing was negative for germline RET, ruling out MEN2. Patient underwent completion left lobectomy with prophylactic bilateral central neck dissection. Pathology showed benign thyroid parenchyma with multinodular hyperplasia and 0/12 LNs. Because of concerning pelvic mass, the patient was referred to OB/GYN. She underwent a laparoscopic bilateral salpingo-oophorectomy. Pathology showed a follicular ovarian cyst, negative for malignancy. A year post-completion total thyroidectomy Ctn remains undetectable, and a CEA is normal at 1.3. Discussion: Because Ctn was already undetectable 1 month after lobectomy with persistent elevated CEA a complete total thyroidectomy with prophylactic bilateral central neck dissection was indicated to achieve operative cure. Ctn is specific to MTC but variable. CEA is more reproducible with less variability; however, it is not specific to MTC and can also be elevated in smokers, benign breast and genitourinary disease, emphysema, cirrhosis, and cancer of colon, rectum, liver, genitourinary, and lung. If residual disease is present, Ctn tends to be proportionally more elevated than CEA. When the opposite occurs, poorly differentiated MTC with possibility of distant metastases vs. a second primary malignancy vs. a distant benign neoplasm known to elevate CEA need to be ruled out. Presentation: 6/2/2024

8769 A Case of Metastatic and Catecholamine Producing Bilateral Pheochromocytoma in a Patient with RET Gene Mutation

Abstract Disclosure: R.A. Mayers: None. A. Szafran-Swietlik: None. RET mutation, observed in multiple endocrine neoplasia type 2 syndromes, is implicated in the development of pheochromocytomas of the kinase signaling cluster. Such tumors have lower metastatic risk and adrenergic production compared to the ones from the other clusters. We present a case of a metastatic, bilateral, small and biochemically active pheochromocytoma .This is the case of a 27-year-old man diagnosed with MEN 2A. He underwent total thyroidectomy due to medullary thyroid carcinoma at 2 years old. He was deemed cured and started on levothyroxine replacement. Since then, his plasma metanephrines by liquid chromatography-mass spectrometry and urine metanephrines done in a yearly basis as screening, were always within range of normality. Over the years, he developed substance abuse disorder with use of Kratom and methamphetamines and was admitted in a rehabilitation center multiple times in the last three years. During this time, the patient was reported to be slightly tachycardiac which was initially attributed to the use of substances. On the last year, an echocardiogram done as evaluation of his tachycardia showed an ejection fraction of 35%. Later, his annual metanephrine levels were markedly elevated (free metanephrine: 137 pg/mL and free normetanephrine : 157 pg/mL, normal ranges reported as less than 57 pg/mL and less than 148 pg/mL respectively). Abdominal tomography showed a right adrenal nodule of 1.2 cm and a left adrenal nodule of 1.6 cm, both with more than 10 Hounsfield Units. A Metaiodobenzylguanidine scan revealed a left adrenal nodule of 1.8 cm with diffuse radiotracer uptake, a right adrenal nodule of 1.2 cm with radiotracer activity and 3 subtle areas of focally increased radiotracer activity in the liver, two in left hepatic lobe and other in posterior right upper lobe. He underwent bilateral adrenalectomy with cortical sparring. Pathology results evidenced a left adrenal with a unifocal mass of 1.8 cm and a right adrenal with a mass of 1.2 cm , both without lymphovascular, capsular, local invasion or necrosis, a mitotic rate of 1-2 without atypical mitosis, not encapsulated with clean margins and positive for synaptophysin , chromogranin and S100 stains. An additional mass of 0.7 cm on the right adrenal gland was described with similar characteristics to the described before except for the involvement of the surgical margins. Currently on the literature there are different opinions regarding screening approach for pheochromocytomas in the presence of RET mutations. There are not strong recommendations regarding the use of imaging as a screening tool in this group of patients. It is important to consider that there are cases, as the one described in this report, that might present metastatic disease even with the presence of small pheochromocytomas that belong to the cluster of kinase signaling. Presentation: 6/3/2024

Survival impact of treatment utilization and margin status after resection of adrenocortical carcinoma

BackgroundThis study examines the combined impact of margin status and adjuvant therapy utilization on overall survival (OS) for adrenocortical carcinoma (ACC) patients undergoing surgery with curative intent. MethodsThe 2004–2020 National Cancer Database (NCDB) was queried for ACC patients ≥18yrs undergoing curative surgery (no debulking), subdivided into R0 and R1/R2-groups, and analyzed using inverse-probability-weighted Cox Proportional Hazard-model. ResultsOf 5023 ACC patients, 3193 underwent curative surgery, 2213 (69 ​%) had R0 margins. Compared to the R0, the R1/R2 group had a decreased OS by 15.6 months (HR ​= ​1.89, p ​= ​0.002). While there has been no significant improvement in margin status over the years studied (2008–2017), there has been an overall increase in the proportion of patients receiving adjuvant therapy regardless of margin status, and the adverse impact of a positive margin on survival has decreased [HR 2.20 vs 1.76] ConclusionsR1/R2 margins are associated with decreased OS. The adverse impact of R1/R2 margins on OS decreased over time while adjuvant therapy utilization increased for all patients.

Transperineal minimally invasive surgery during laparoscopic abdominoperineal resection for low rectal cancer could improve short-term outcomes: A single-institution retrospective cohort study.

Transperineal minimally invasive surgery (TpMIS) during laparoscopic abdominoperineal resection (APR) is an emerging approach that allows for the precise treatment of lower rectal cancer. However, evidence regarding the efficacy of TpMIS is insufficient. This study evaluated the efficacy of TpMIS during laparoscopic APR for patients with lower rectal cancer. Patients who underwent laparoscopic APR with TpMIS (TpMIS group; n = 12) and those who underwent conventional laparoscopic APR for low rectal cancer (conventional group; n = 13) were enrolled consecutively in this retrospective study. Standardized TpMIS was performed at our institution. Patient and tumor characteristics and intraoperative, postoperative, and pathological outcomes were compared between groups. The primary outcome was postoperative perineal wound infection. No patients in the TpMIS group experienced postoperative perineal wound infection; however, five (38.5%) patients in the conventional group experienced postoperative perineal wound infection (significant difference; p = 0.016). The estimated blood loss (median, 81mL vs. 463mL) and incidence of postoperative urinary dysfunction (8.3% vs. 46.1%) were significantly lower in the TpMIS group than in the conventional group. The postoperative hospital stay (median, 13 vs. 20days) of the TpMIS group was significantly shorter than that of the conventional group. Pathological outcomes did not differ between groups. The positive circumferential resection margin rates of the TpMIS and conventional groups were 8.3% and 15.4%, respectively. TpMIS during laparoscopic APR was associated with significant improvements in the postoperative outcomes of patients with low rectal cancer.

The clinical outcomes and prognostic factors of dedifferentiated central chondrosarcoma in extremities

ObjectiveThis study was to analyze the clinical outcomes and prognostic factors of dedifferentiated central chondrosarcomas (DCCS) in extremities.MethodsA retrospective study was conducted on 49 patients (27 males, 22 females) who underwent surgical treatment between January 2001 and March 2023 in our institution. All patients were diagnosed with dedifferentiated central chondrosarcomas by needle biopsy or postoperative histopathological examination. The general characters, treatment and clinical outcomes were recorded in the follow-up and all surgical-related complications that occurred were recorded in this study. Overall, these data were used to analyse the prognostic factors of DCCS.Results49 patients were included in this retrospective study and there were no patients lost in the follow-up period. The median diagnosis age of all patients was 57 years old (ranging from 17 to 87) and the median follow-up time was 34 months (range, 1-289). The average tumor size was 9.6 ± 2.4 cm (3.0-15.5). Median overall survival (OS) and progression-free survival (PFS) were 34 and 23 months, respectively. The 1-year, 2-year, 5-year, and 10-year OS were 87.8% (95% CI 77.6%-98.0%), 71.4% (35/49), 28.6% (14/49) and 18.4% (9/49). And the 1-year, 2-year, 5-year, and 10-year PFS were 75.5% (95% CI 63.6%-87.4%), 49.0% (35/49), 26.5% (14/49) and 16.3% (9/49). Multiple variate analyses indicated metastasis, pathological fracture, Enneking staging and surgical margin were independent prognostic factors in extremity dedifferentiated central chondrosarcomas.ConclusionsDedifferentiated central chondrosarcomas in extremities still had a grave prognosis. Metastasis, pathological fracture, Enneking staging, and surgical margin were independent risk factors for prognosis.Evidence levelIV Therapic.

Spinal chordoma and chondrosarcoma treatment experiences - a 20-year retrospective study from databases of two medical centers

The research retrospectively analyzed cases of spinal chordoma and chondrosarcoma involving patients who received treatment at the two hospitals between 2001 and 2023. Among the 48 patients studied (39 chordoma and 9 chondrosarcoma cases), the average age was 53.9 ± 15.8 years, with a range of 17 to 86 years. Out of these patients, 43 underwent excision surgery and were categorized based on tumor margin into negative (R0) or microscopically positive (R1) margin (n = 14) and macroscopically positive (R2) margin (n = 29) groups. The mean overall survival (OS) for R0/R1 and R2 groups was 156.5 ± 19.3 and 79.2 ± 11.9 months, respectively (p value = 0.012). The mean progression-free survival (PFS) for R0/R1 and R2 was 112.9 ± 24.4 and 25.5 ± 5.5 months (p value < 0.001). The study showed that regardless of whether patients in the R0/R1 or R2 groups received radiation therapy (RT) or not, there was no significant improvement in OS or PFS. Specifically, the OS and PFS for the RT only group were 75.9 ± 16.6 and 73.3 ± 18.0 months. In conclusion, the recommended treatment approach for spinal chordoma and chondrosarcoma remains en bloc resection surgery with an appropriate margin. Patients who are unsuitable for or decline surgery may find a beneficial disease control rate with traditional external beam photon/proton therapy.

Surgical Reconstruction in Malignant Eyelid Tumors.

To report the histopathological subtypes of malignant eyelid tumors treated surgically in the author's clinic and to present the author's graft and flap preferences in the reconstruction of the eyelid defect after surgical excision. This retrospective study included 33 patients who underwent malignant eyelid tumor excision, followed by eyelid reconstruction. A frozen section was performed during surgery to assess surgical margins in all patients. Demographic characteristics, histological classification, localization, and size of the tumor, postoperative defect size, follow-up period, complications, and recurrence rate were recorded. Of the patients with a mean age of 66.6 ± 15.3 (range: 23-94), 15 (45.5%) were females and 18 (54.5%) were males. The lower eyelid was the most commonly involved site in 27 (81.8%) patients. Basal cell carcinoma was the most frequently diagnosed type of malignant cancer in 81.8% (n = 27) of the cases. Among the tumor subtypes, nodular type basal cell carcinoma was the most frequently observed subtype in 10 (30.3%) patients. Wide excision with different flap and graft techniques was performed in 26 (78.8%) patients with defect sizes of 40% or larger. In the author's study, the most preferred flap technique for anterior lamella reconstruction was the Tenzel semicircular flap (30.3% n = 10). The most frequently preferred flap for posterior lamella reconstruction was the Hughes tarsoconjunctival flap (30.3% n = 10). There were no flap or graft failures in any of the author's cases. In the treatment of malignant eyelid tumors, different local flap and graft techniques selected according to the size of the defect have successful anatomical results in reconstructive surgery after frozen section controlled excision.

The impact of surgical technique on very early functional outcomes after radical prostatectomy.

To determine the very early functional as well as oncological outcomes after robot-assisted radical prostatectomy (RARP) and open radical prostatectomy (ORP) at a single institution. We identified patients who underwent RARP or ORP at our institution between August 2021 and July 2023. The main criterion for surgical technique selection was patient preference. Primary endpoints included anastomosis leakage rate, very early continence rate reported by standardized pad-test, and positive surgical margin rate. Furthermore, we analyzed operation time, hospital stay, postoperative analgesia, and complication rates. In this prospective study, we analyzed data from 222 radical prostatectomies (111 RARP and 111 ORP). There were no significant differences in preoperative age, prostate size, and risk stratification among the groups. Patients who underwent RARP had lower anastomosis leakage rates (8.1% vs. 18.9%) and slightly lower early continence rates (76.6% vs. 78.4%) when compared to patients who underwent ORP. Positive surgical margin rates were similar, and complication rates were also comparable. Operation time was similar for both techniques, but the hospital stay was significantly shorter in the RARP group (6.3 vs. 9.1 days, p=0.03). The ORP group experienced significantly higher opioid administration postoperatively (p<0.001). From a functional and oncological point of view, both techniques are safe and provide excellent outcomes when performed by experienced surgeons. Nevertheless, patients are likely to benefit from a shortened hospital stay and reduced postoperative pain after RARP.

B-332 Use of urinary volatile organic compounds in monitoring prostate cancer after radical prostatectomy

Abstract Background Prostate cancer (PCa) is the most commonly diagnosed non-cutaneous cancer among males and the second cause of cancer-related deaths. PCa treatment involves different methods, and most common is radical prostatectomy (RP), which entails removal of prostate-gland from men who have been diagnosed with PCa. Prostatic-specific-antigen (PSA) has been used for detection of recurrent disease for years. After its introduction as biochemical recurrence (BCR) marker, men with distinct diseases were treated similarly. Overtime, it has been observed that PSA relapse presents several meanings according to clinicopathological features, like Gleason score, PSA-doubling-time, clinical stage, surgical margin status. Despite this, PSA remains main tool to assess disease progression after RP. RP remains primary treatment for localized PCa and has been performed for years with excellent oncologic control. However, approximately 20-40% of patients with clinically localized PCa will present biochemical-recurrence (BCR) after RP, while some with recurrent-metastasis. The study aims to investigate potential volatile organic compounds (VOCs) associated with men who have undergone RP but still abhor the disease. Methods Urine samples were collected from 110 male adults with biopsy-proven PCa-positive results before and after RP. VOCs in urine were extracted by stir-bar-sorptive-extraction and analyzed using thermal-desorption with gas chromatography-mass spectrometry. Metabolomics and machine-learning tools used to develop and evaluate models for PCa diagnosis before and after RP. Results PLS-DA and VIP loading plots identified potential VOC panels that could be used to differentiate PCa patients before and after RP and those with BCR and recurrent metastasis. Furthermore, logistic-regression results with validation provide a promising diagnostic model for PCa diagnosis after RP. Conclusions This novel method using urinary VOCs was developed to fill gaps in PCa monitoring after RP. These research findings could aid and fast-track the provision of rapid point of care to the treated PCa patients who still abhor the disease.

Visual pathology reports for communication of final margin status in laryngeal cancer surgery

BackgroundPositive margins are frequently observed in total laryngectomy (TL) specimens. Effective communication of margin sampling sites and final margin status between surgeons and pathologists is crucial. In this study, we evaluate the utility of multimedia visual pathology reports to facilitate interdisciplinary discussion of margin status in laryngeal cancer surgery. MethodsEx vivo laryngeal cancer surgical specimens were three-dimensional (3D) scanned before standard of care pathological analysis. Using computer-aided design software, the 3D model was annotated to reflect inking, sectioning, and margin sampling sites, generating a visual pathology report. These reports were distributed to head and neck surgeons and pathologists postoperatively. ResultsFifteen laryngeal cancer surgical specimens were 3D scanned and virtually annotated from January 2022 to December 2023. Most specimens (73.3%) were squamous cell carcinomas (SCCs). Among the cases, 26.7% had final positive surgical margins, whereas 13.3% had close margins, defined as <5 mm. The visual pathology report demonstrated sites of close or positive margins on the 3D specimens and was used to facilitate postoperative communication between surgeons and pathologists in 85.7% of these cases. Visual pathology reports were presented in multidisciplinary tumor board discussions (20%), email correspondences (13.3%), and teleconferences (6.7%), and were referenced in the final written pathology reports (26.7%). Conclusions3D scanning and virtual annotation of laryngeal cancer specimens for the creation of visual pathology reports is an innovative approach for postoperative pathology documentation, margin analysis, and surgeon–pathologist communication.

Tumor involvement of the trigone and urethra at the time of robot-assisted radical cystectomy is associated with adverse oncological outcomes

IntroductionThe trigone/urethra (T/U) has a distinct embryologic origin and a different histologic morphology compared to the rest of the urinary bladder. We sought to determine the association between tumors involved in the T/U and the presence of variant histology, pathologic, and oncologic outcomes in patients who underwent robot-assisted radical cystectomy (RARC). MethodsTumor location was classified into 2 groups: tumors in the bladder walls only, or tumors in the T/U area, with or without involvement of other bladder walls. Univariable and multivariable Cox regression models were used to determine the association between T/U with recurrence-specific (RSS), cancer-specific (CSS), and overall survival (OS). Results608 patients who underwent RARC were identified, T/U involvement occurred in 191 (31%). Patients in the T/U group were more likely to have pT3/pT4 (57% vs. 42%, P < 0.01), positive surgical margins (21% vs. 9%, P < 0.01), and received salvage chemotherapy more frequently (16% vs. 8%, P < 0.01). Squamous variant histology was more frequent in the T/U group (25% vs. 17%, P = 0.02). On multivariable analysis, T/U location was independently associated with RSS (HR1.63, 95% CI 1.23–2.16, P < 0.01) and CSS (HR1.50, 95% CI 1.04–2.16, P = 0.02) but not OS. ConclusionResidual T/U tumor involvement was associated with a higher risk of an advanced tumor stage, positive margin, cancer recurrence, and cancer-specific death.

Postoperative surgical margin results of the phyllodes tumors from a tertiary hospital.

Phyllodes tumors in the breast are exceptionally uncommon fibroepithelial tumors. In the literature, they are typically categorized as benign phyllodes tumor, borderline phyllodes tumor, and malignant phyllodes tumor. This study aims to assess and present the clinical and surgical outcomes of patients diagnosed with phyllodes tumor. The outcomes of patients aged 18 years and above diagnosed with phyllodes tumor between 2006 and 2023 were retrospectively reviewed. Patients were grouped as benign phyllodes tumor and borderline/malignant phyllodes tumor and compared by clinical and surgical results. Of all 57 patients with phyllodes tumor, 64.9% (n=37) were benign phyllodes tumor and 35.1% (n=20) were borderline/malignant phyllodes tumor [22.8% (n=13) borderline phyllodes tumor and 12.3% (n=7) malignant phyllodes tumor]. When the patients were divided into two groups as benign phyllodes tumor and borderline/malignant phyllodes tumor and compared, our cumulative (total) recurrence rate was 14.0%, with final surgical margin width between groups [(0<final surgical margin<2 mm vs final surgical margin≥2 mm) (p=0.154)] and recurrence [(8.1% benign phyllodes tumor vs 25.0% borderline/malignant phyllodes tumor) (p=0.080)]; there was no significant difference between our rates. Phyllodes tumors of the breast can be followed up with a narrow negative surgical margin (0 mm<final surgical margin<2 mm). However, after the initial surgery, re-excision is recommended for positive margins, while a wider surgical margin (≥10 mm) is not necessary for excision.