Surgical Skills Research Articles

Training in cardiothoracic surgery: The role for simulation.

Adequate cardiothoracic surgical training is essential for provision of quality care to patients. In recent years, simulation-based training has been advocated as an adjunct to traditional surgical training. Advances in simulation technology has resulted in many low- and highfidelity simulators being employed in cardiothoracic surgical training. Such models allow trainees to practice an array of realistic full-length procedures in a safe and controlled environment, with the window to make mistakes and consider them learning points. There is significant evidence to demonstrate the effectiveness of cardiothoracic surgery simulation in improving surgical skills and operating room performances in addition to building confidence among trainees. However, owing to the high financial cost of arranging it, simulation-based training is not widespread in low- and middle-income countries, including Pakistan. More work is warranted on the cost effectiveness of implementing simulation-based learning, which, in turn, would increase the uptake of simulation to enhance cardiothoracic surgical training in Pakistan.

DS22 Enhancing dermatology surgical skills through simulation training

DS22 Enhancing dermatology surgical skills through simulation training

A Randomized Crossover Trial Evaluating the Impact of Cultural Dexterity Training on Surgical Residents' Knowledge, Cross-Cultural Care, Skills, and Beliefs: The Provider Awareness and Cultural Dexterity Training for Surgeons (PACTS) Trial.

This trial examines the impact of the Provider Awareness and Cultural dexterity Toolkit for Surgeons (PACTS) curriculum on surgical residents' knowledge, cross-cultural care, skills, and beliefs. Cross-cultural training of providers may reduce health care outcome disparities, but its effectiveness in surgical trainees is unknown. PACTS focuses on developing skills needed for building trust, working with patients with limited English proficiency, optimizing informed consent, and managing pain. The PACTS trial was a randomized crossover trial of 8 academic general surgery programs in the United States: The Early group ("Early") received PACTS between periods 1 and 2, while the Delayed group ("Delayed") received PACTS between periods 2 and 3. Residents were assessed preintervention and postintervention on Knowledge, Cross-Cultural Care, Self-Assessed Skills, and Beliefs. χ 2 and Fisher exact tests were conducted to evaluate within-intervention and between-intervention group differences. Of 406 residents enrolled, 315 were exposed to the complete PACTS curriculum. Early residents' Cross-Cultural Care (79.6%-88.2%, P <0.0001), Self-Assessed Skills (74.5%--85.0%, P <0.0001), and Beliefs (89.6%-92.4%, P =0.0028) improved after PACTS; knowledge scores (71.3%-74.3%, P =0.0661) were unchanged. Delayed resident scores pre-PACTS to post-PACTS showed minimal improvements in all domains. When comparing the 2 groups in period 2, Early residents had modest improvement in all 4 assessment areas, with a statistically significant increase in Beliefs (92.4% vs 89.9%, P =0.0199). The PACTS curriculum is a comprehensive tool that improved surgical residents' knowledge, preparedness, skills, and beliefs, which will help with caring for diverse patient populations.

Practice guidelines on endoscopic surgery for qualified surgeons by the endoscopic surgical skill qualification system: Introduction.

Practice guidelines on endoscopic surgery for qualified surgeons by the endoscopic surgical skill qualification system: Introduction.

The Effect of a Short Training Course of Hysteroscopic Myoma Resection on the Non-Technical Skills of Gynecologic Surgeons.

To assess the impact of a hysteroscopic myoma resection (HMR) two-day training course on non-technical (cognitive) surgical skills among gynecologists. A 2-day educational course was held in which 95 consultant gynecologic surgeons and beginner infertility fellowship residents took part. Among all 80 participants (84.2%) had ever performed diagnostic hysteroscopy and 30 (31.3%) had performed non-resectoscopic operative hysteroscopy. The training program included instructive speeches, simulated surgical presentations, and a live hands-on myomectomy workshop. Non-technical skills were assessed two times, once before and the other after the course through two written tests with 10 multiple-choice questions for each. Concerning the 95 participants, 43 (47.3%) took the pre-course test and all of them (100%) took the post-course one. The mean score improved significantly from 3 (interquartile range [IQR], 0-4.0) to 7 (IQR, 5.0- 8.0) [bootstrap p<0.0001] for each of the randomly chosen pairings. The majority of candidates showed significantly improved cognitive skills after the HMR course despite their poor cognitive skills before the course. According to further analysis, there were significant enhancements in grades for all topics, especially regarding the basic principles of the procedure and management of complications (bootstrap p<0.0001). The odds ratio for the pre- versus post-course mean test results was 5.23. Due to the confidentiality stipulation, the pre- and post-course scores were not matched. A two-day continuing medical educational course could be efficient in improving the nontechnical (cognitive) skills for HMR.

A surgical instrument motion measurement system for skill evaluation in practical laparoscopic surgery training.

This study developed and validated a surgical instrument motion measurement system for skill evaluation during practical laparoscopic surgery training. Owing to the various advantages of laparoscopic surgery including minimal invasiveness, this technique has been widely used. However, expert surgeons have insufficient time for providing training to beginners due to the shortage of surgeons and limited working hours. Skill transfer efficiency has to be improved for which there is an urgent need to develop objective surgical skill evaluation methods. Therefore, a simple motion capture-based surgical instrument motion measurement system that could be easily installed in an operating room for skill assessment during practical surgical training was developed. The tip positions and orientations of the instruments were calculated based on the marker positions attached to the root of the instrument. Because the patterns of these markers are individual, this system can track multiple instruments simultaneously and detect exchanges. However due to the many obstacles in the operating room, the measurement data included noise and outliers. In this study, the effect of this decrease in measurement accuracy on feature calculation was determined. Accuracy verification experiments were conducted during wet-lab training to demonstrate the capability of this system to measure the motion of surgical instruments with practical accuracy. A surgical training experiment on a cadaver was conducted, and the motions of six surgical instruments were measured in 36 cases of laparoscopic radical nephrectomy. Outlier removal and smoothing methods were also developed and applied to remove the noise and outliers in the obtained data. The questionnaire survey conducted during the experiment confirmed that the measurement system did not interfere with the surgical operation. Thus, the proposed system was capable of making reliable measurements with minimal impact on surgery. The system will facilitate surgical education by enabling the evaluation of skill transfer of surgical skills.

Influence of proficiency in conventional laparoscopic surgery in colorectal cancer on the introduction of robotic surgery.

Although there have been many reports on learning curves for robotic surgery, it is unclear how surgeons' conventional laparoscopic surgical skills influence their ability in performing robotic surgery for colorectal cancer (CRC). The aim of this study was to determine the surgical outcomes of robotic surgery for CRC during the induction phase by skilled laparoscopic surgeons. Surgical outcomes of consecutive CRC cases between January 2021 and March 2023 following the skilled phase of laparoscopic surgery and introductory phase of robotic surgery performed by three skilled laparoscopic surgeons were compared. Overall, 77 consecutive patients diagnosed with sigmoid colon or rectosigmoid cancer were analysed, including 50 in the laparoscopy group (LAP) and 27 in the robotic group (Ro). Patient characteristics, including age, sex, body mass index, and tumour progression, did not differ between the groups. The median operation time was 204min in the robotic group and 170min in the laparoscopic group (p < 0.001). Blood loss was significantly lower in the robotic group (p = 0.0059). The incidence of grade 2 or higher complications did not differ between the two groups (LAP, 10.0% vs. Ro, 7.4%, p = 1). In the robotic group, the time required for lymph node dissection had a greater impact on operative duration. Skills acquired from performing conventional laparoscopic surgery may contribute to the safe and reliable performance of robotic surgery for CRC. UMIN000050923.

Persistent unmet need for surgical care in Western Uganda.

Treatable surgical diseases account for a significant proportion of the global burden of disease, particularly in low- and middle-income communities. The number of deaths owing to poor surgical care or its non-availability has been reported to exceed those from HIV/AIDS, tuberculosis and malaria combined. The Ugandan government and its development partners aim to put in place measures to achieve universal health coverage for all communities. These include construction and equipping health facilities, training of health workers, opening up road networks, and poverty alleviation programmes. However, these efforts have, as yet, fallen short as evidenced by external hernias remaining the leading cause of intestinal obstruction for more than 40 years. We recommend establishment of global surgery collaborations with rural-based medical training schools and other health facilities, essential surgical skills training for medical students, task shifting in surgical care and integration of regular surgical camps in the Uganda's healthcare delivery model.

Virtual reality simulation to enhance advanced trauma life support trainings – a randomized controlled trial

BackgroundAdvanced Trauma Life Support (ATLS) is the gold standard of initial assessment of trauma patients and therefore a widely used training program for medical professionals. Practical application of the knowledge taught can be challenging for medical students and inexperienced clinicians. Simulation-based training, including virtual reality (VR), has proven to be a valuable adjunct to real-world experiences in trauma education. Previous studies have demonstrated the effectiveness of VR simulations for surgical and technical skills training. However, there is limited evidence on VR simulation training specifically for trauma education, particularly within the ATLS curriculum. The purpose of this pilot study is to evaluate the feasibility, effectiveness, and acceptance of using a fully immersive VR trauma simulation to prepare medical students for the ATLS course.MethodsThis was a prospective randomised controlled pilot study on a convenience sample of advanced medical students (n = 56; intervention group with adjunct training using a commercially available semi-automated trauma VR simulation, n = 28, vs control group, n = 28) taking part in the ATLS course of the Military Physician Officer School.Feasibility was assessed by evaluating factors related to technical factors of the VR training (e.g. rate of interruptions and premature termination). Objective and subjective effectiveness was assessed using confidence ratings at four pre-specified points in the curriculum, validated surveys, clinical scenario scores, multiple choice knowledge tests, and ATLS final clinical scenario and course pass rates. Acceptance was measured using validated instruments to assess variables of media use (Technology acceptance, usability, presence and immersion, workload, and user satisfaction).ResultsThe feasibility assessment demonstrated that only one premature termination occurred and that all remaining participants in the intervention group correctly stabilised the patient. No significant differences between the two groups in terms of objective effectiveness were observed (p = 0.832 and p = 0.237 for the pretest and final knowledge test, respectively; p = 0.485 for the pass rates for the final clinical scenario on the first attempt; all participants passed the ATLS course). In terms of subjective effectiveness, the authors found significantly improved confidence post-VR intervention (p < .001) in providing emergency care using the ATLS principles. Perceived usefulness in the TEI was stated with a mean of 4 (SD 0.8; range 0–5). Overall acceptance and usability of the VR simulation was rated as positive (System Usability Scale total score mean 79.4 (SD 11.3, range 0–100).ConclusionsThe findings of this prospective pilot study indicate the potential of using VR trauma simulations as a feasible and acceptable supplementary tool for the ATLS training course. Where objective effectiveness regarding test and scenario scores remained unchanged, subjective effectiveness demonstrated improvement.Future research should focus on identifying specific scenarios and domains where VR can outperform or enhance traditional learning methods in trauma simulation.

Hirase technique: A step-by-step procedure for fingertip sub/amputation in children with cooling composite graft

Fingertip partial or complete amputations are the most common hand injuries among pediatric population. Different treating options are nowadays available, with microsurgery that has been pushing further and further its technical limits; nevertheless it requires extraordinary surgical skills and experience. We present our step-by-step technique according to Hirase’s composite cooling graft principles as an effective alternative to more complex solutions. This procedure showed excellent results in children, with promising results even in young adults.

Comparison of Patients' and Surgeons' Expectations before Shoulder Arthroplasty.

Background: Patients suffering from osteoarthritis particularly complain about pain during day and night as well as loss of function. This consequently leads to impaired quality of life and therefore psychological stress. The surgical therapy of choice is joint replacement. Regarding the outcome after operation, expectations might differ between the patient and the surgeon. This can lead to dissatisfaction on both sides. This study aimed to document patients' expectations of a planned shoulder joint replacement. The results were compared with assessments made by shoulder surgeons. Methods: In total, 50 patients scheduled for operative shoulder joint replacement were included in this study, as well as 10 shoulder surgeons. Patients were requested to fill out questionnaires preoperatively to provide sociodemographic data, PROMS (Patient-Reported Outcome Measures) with regard to the pathology and their expectations about surgery in terms of pain relief, gain of range of motion, strength as well as the impact on activities of daily and professional life and sports. In addition, surgeons were asked what they thought their patients expect. Results: The most important goal to achieve for patients was to relieve daytime pain, followed by improvement of self-care and the ability to reach above shoulder level. The most important factors for patients to achieve after operation were 'pain relief' in first place, 'movement' in second and 'strength' in third. This also applied to shoulder surgeons, who ranked 'pain relief' first, followed by 'movement' and 'strength'. When patients where asked what is most important when it comes to choosing their surgeon, 68% voted for 'surgical skills', 28% for 'age/experience', followed by 'empathy', 'sympathy' and 'appearance'. For surgeons, 'age/experience' obtained rank one, 'surgical skills' was ranked second, followed by 'sympathy', 'empathy' and 'appearance'. Surgeons significantly underrated the factor 'empathy' in favor of 'sympathy'. Conclusions: This study shows that patients' expectations for shoulder joint replacement and surgeons' assessments do not differ significantly. Relief from pain and better shoulder movement were crucial for patients to achieve after operation, which was in line with surgeons' expectations. The most important factor for choosing the surgeon was 'surgical skills' for patients, while surgeons thought they would care more about 'age and experience'. This underlines that patients' expectations should be taken into account within the preoperative medical interview. This might allow an optimization of compliance of the patients and lead to a better satisfaction on both sides.

Skill assessment based on clutch use in cross-platform robot-assisted surgery.

Many studies have investigated the transfer of skills between laparoscopic and robot-assisted surgery (RAS). These studies have considered time, error, and clinical outcomes in the assessment of skill transfer. However, little is known about the specific operations of the surgeon. Clutch control use is an important skill in RAS. Therefore, the present study aimed to propose a novel objective algorithm based on computer vision that can automatically evaluate a surgeon's clutch use. Additionally, the study aimed to evaluate the correlation between clutch metrics and surgical skill on different surgical robot platforms. The robotic surgery training center of Wuhan University trained 30 laparoscopic surgeons as the study group between 2023 and 2024. Laparoscopic surgeons were trained by combining robotic simulator exercises and RAS animal experiments. During the training, video and hand movement data were collected. Hand movements identified by a skin-color model were combined with labeling information to classify clutch use. The metrics were validated on different robotic platforms (dv-Trainer, EDGE MP1000, Toumai™ MT1000, and DaVinci Xi system) and among surgeons with different surgical skill levels. On the robotic simulator, clutch accuracy in the expert group was significantly higher than in the study group for all tasks. No significant differences were observed in the number of clutches between the expert and study groups. In the RAS experiment, the number of clutches decreased significantly for both study and expert groups. The accuracy was maintained at a high level in the expert group but decreased rapidly in the study group. We proposed a new objective assessment of surgical skills, clutch use metrics, in cross-platform RAS. Additionally, we verified that the metrics significantly correlated with the surgical skill levels of the surgeons.

The PLET (Portable Laparoscopic Endo-Trainer) study: a randomized controlled trial of home- versus hospital-based surgical training

PurposeThe purpose of this study was to assess the effect of training with a personal, portable laparoscopic endo-trainer (PLET) on residents’ laparoscopic skills.MethodsThe study took place at a tertiary-care academic university hospital in Switzerland. All participants were randomized to either a home- or hospital-based PLET training group, and surgical skill performance was assessed using five laparoscopic exercises. 24 surgical residents, 13 females and 11 males, were enrolled at any training stage. Nine residents completed the assessments. Endpoints consisted of subjective and objective assessment ratings as well as exercise time and qualitative data up to 12 weeks. The primary outcome was the difference in exercise time and secondary outcomes included performance scores as well as qualitative data.ResultsThe hospital-based training group performed exercises number 1, 3 and 4 faster at 12 weeks than at baseline (p = .003, < 0.001 and 0.024). Surgical skill performance was not statistically significantly different in any of the endpoints between the hospital- and home-based training groups at 12 weeks. Both the subjective and objective assessment ratings significantly improved in the hospital-based training group between baseline and 12 weeks (p = .006 and 0.003, respectively). There was no statistically significant improvement in exercise time as well as subjective and objective assessment ratings over time in the home-based training group. The qualitative data suggested that participants who were randomized to the hospital-based training group wished to have the PLET at home and vice versa. Several participants across groups lacked motivation because of their workload or time constraints, though most believed the COVID-19 pandemic had no influence on their motivation or the time they had for training.ConclusionThe PLET enhances laparoscopic surgical skills over time in a hospital-based training setting. In order to understand and optimize motivational factors, further research is needed.Trial registrationThis trial was retrospectively registered on clinicaltrials.gov (NCT06301230).

Stakeholder perspectives on scaling robotic surgery in India: qualitative research.

Robotic surgery (RS) is a milestone in minimally invasive surgery. More than 500 surgeons are trained in RS in India, and more than 100 robotic systems have been installed across various centers. RS offers various benefits to patients and surgeons. Although it is rapidly advancing and has several advantages, a robotic system is a complex system that is equipped with complex instruments. Qualitative research aims to take a broad view of the perceptions of stakeholders of RS and to synthesize their views to gain insight into scaling RS. This qualitative study aimed to explore the perspectives of relevant stakeholders on RS to learn how to develop the field and make it more affordable. This study is based on grounded theory methodology and uses the standards for reporting qualitative research (SRQR) guidelines for reporting. Three premier hospitals that are pioneers in RS in India served as the study locations. Purposive sampling was used to collect data from surgeons, nurses, and insurance staff. The surgeons interviewed have national and international exposure and are consulting and performing robotic surgeries across India and internationally. We conducted one-on-one interviews and wrote memos to gather further information before approaching each stakeholder. Samples were determined based on theoretical saturation. Fellowship training, which includes simulation, bedside assistance, and individual cases under supervision, was found to be the standard training method. The stakeholders mentioned a few prerequisites for performing RS, such as prior laparoscopic experience, passion for surgical knowledge and skill, and proper case selection. The surgeons discussed some technical considerations of RS, such as medico-legal issues and mechanical faults associated with it. Although there is increased scope for establishing robotic surgery, surgeons feel that the cost of RS is high. From the interactions with the stakeholders, it is understood that robotic surgeons are the most significant players in RS. Robotic surgery demands more skills and more trained professionals to scale up. Key findings highlight the importance of fellowship training, prior laparoscopic experience, and proper case selection. While RS has potential for growth, high costs, and technical issues remain concerns. Insurance companies include robotic surgery in their policies under the category of "modernized medicine." Depending on the insurance plan that the patient selects, the necessity of the robotic surgery, and the surgeon's justification, the insurance company will pay for the patient's robotic surgery. To make it affordable for patients, complete insurance coverage is mandatory along with creating more awareness among patients. The growth of RS is inevitable in the future with other robotic companies emerging which will ultimately reduce the capital cost and robotic surgeons are pivotal in advancing RS.

A structured curriculum for the acquisition of basic surgical endoscopic skills for surgical residents and quantification of skills improvement

IntroductionNew strategies and methods are needed to ensure that new generations can train and acquire surgical skills in a safe environment. Materials and methodsFrom January 2020 to October 2020, we performed a single centre, prospective observational cohort study. 19 participants (15 students, 4 residents) enrolled and 16 participants (13 students, 3 residents) successfully completed the curriculum. We performed a quantitative data analysis to evaluate its effectiveness in gaining and improving basic surgical endoscopic skills. ResultsThe time for single knot tying pre-, mid-, and post-training was reduced significantly, the average time (sec) decreased by 79.5 % (p < 0.001), the total linear distance (cm) by 74.5 % (p < 0.001) and the total angular distance (rad) by 71.7 % (p < 0.001). The average acceleration (mm/s2) increased by 20 % (p = 0.041). Additionally, the average speed increased by 23.5 % (p < 0.001), while motion smoothness (m/s3) increased by 20.4 % (p = 0.02). ConclusionThe obtained performance scores showed a significant increase in participants improving their basic surgical performance skills on the endoscopic simulator. This curriculum can be easily implemented in any surgical specialty as part of the residency training curriculum before first exposure in the operation room. All 16 participants recommended the implementation of such simulator training in their surgical training curriculum.

Placement of a drainage tube in the ileac lumen following laparoscopic appendectomy: A case report and literature review.

Ileal perforation caused by the insertion of a drainage tube is a rare complication. Hence, the utilization of surgical drains in abdominal surgery remains controversial. At present, there is a trend to reduce the utilization of drains in abdominal surgery, although certain situations may necessitate their application. A 25-year-old Chinese woman presented with a history of right lower abdominal pain persisting for 10 days. Imaging examinations, including abdominal computed tomography and ultrasound, identified low-density lesions measuring 10 × 8 × 8cm3 in the right lower abdomen, which are consistent with perforated appendicitis complicated by a peri-appendiceal abscess. A laparoscopic appendectomy was carried out. On the 5th postoperative day, the drainage fluid changed to a grass-green color (80mL). Imaging with retrograde contrast through the drainage tube revealed that the 26 Fr silicon rubber drainage tube tip was positioned 50cm away from the ileocecal junction within the ileum. Both the ileal and ileocecal regions appeared well-developed. Oral intake was suspended, and the patient received antacids, somatostatin, antibiotics, and total parenteral nutrition. On the 19th postoperative day, a follow-up imaging procedure using retrograde contrast through the drainage tube indicated that the tube tip was sealed. The treatment concluded on day 33 postoperatively, and the patient was discharged. Ileal perforation due to an abdominal drainage tube following laparoscopic appendectomy constitutes a rare but serious complication. However, due to the adhesion and inflammatory changes around the abscess, laparoscopic dissection becomes a challenging and risky process, and the surgical skills and experiences are particularly important. Removing the abdominal drainage tube promptly based on the characteristics of the drainage fluid is recommended. The findings provide valuable insights for surgeons navigating similar challenges.

Virtual Reality vs Phantom Model: Benefits and Drawbacks of Simulation Training in Neurosurgery.

Traditional neurosurgical education has relied heavily on the Halstedian "see one, do one, teach one" approach which is increasingly perceived as inefficient in contemporary settings marked by a steady decline in surgical caseload. In recent years, simulation training has emerged as an effective and accessible training alternative. To date, however, there is no standardized criterion pertaining to the quality and implementation of simulators in neurosurgical education and training. This research aims to compare the efficacy of virtual reality (VR) and Phantom-based simulation training in the context of neurosurgical skill acquisition, with a focus on middle cerebral artery aneurysm clipping. An immersive VR clipping tool and a haptic clipping simulator incorporating 3-dimensional printing, additive manufacturing, and rheological analyses were developed. Twenty-two participants, comprising 12 medical students, 6 neurosurgical residents, and 4 experienced neurosurgeons, tested and evaluated both simulators for face and content validity. Construct and predictive validity of the simulators were assessed using an objective structured assessment scale for aneurysm clipping, measuring participants' performances and progress. Both modalities were deemed highly advantageous for educational purposes. Objective evaluations, however, revealed measurable differences in usability, efficacy, and transferability of the learned skills with VR excelling in procedural planning and visualization while Phantom simulation being noticeably superior in conveying surgical skills. Simulation training can accelerate the neurosurgical learning curve. The results of this study highlight the importance of establishing standardized criteria for the implementation and assessment of simulation modalities, ensuring consistent quality and efficacy in neurosurgical education.

The use of additive 3D printing technologies in the training of vertebrologists

Additive technologies (3D printing) can be used in teaching surgical treatment of diseases and injuries of the spinal column due to the ability to produce both standard anatomical models and models based on patient imaging data. The presented opportunities allow you to practice and maintain manual surgical skills, choose the most appropriate surgical treatment tactics at the preoperative stage, taking into account the individual anatomical characteristics of the patients and the characteristics of the pathological process.

Effect of Self-Training Using Virtual Reality Head-Mounted Display Simulator on the Acquisition of Holmium Laser Enucleation of the Prostate Surgical Skills.

We aimed to evaluate the effect of self-training using a virtual reality head-mounted display simulator on the acquisition of surgical skills for holmium laser enucleation surgery. Thirteen medical students without surgical skills for holmium laser enucleation of the prostate were trained using multimedia to learn the technique via simulator manipulation. Thereafter, participants performed the technique on a virtual benign prostatic hyperplasia model A (test A). After a 1-week wash-out period, they underwent self-training using a simulator and performed the technique on model B (test B). Subsequently, participants were asked to respond to Training Satisfaction Questions. Video footage of hand movements and endoscope view were recorded during tests A and B for later review by 2 expert surgeons. A 20-step Assessment Checklist, 6-domain Global Rating Scale, and a Pass Rating were used to compare performance on tests A and B. Thirteen participants completed both tests A and B. The 20-step Assessment Checklist and 6-domain Global Rating Scale evaluation results showed significantly improved scores in test B than in test A (P<0.05). No evaluator rated participants as passed after test A, but 11 participants (84.6%) passed after test B. Ten participants (76.9%) indicated that the simulator was helpful in acquiring surgical skills for holmium laser enucleation of the prostate. The virtual reality head-mounted display holmium laser enucleation of the prostate simulator was effective for surgical skill training. This simulator may help to shorten the learning curve of this technique in real clinical practice in the future.

Tailored axillary surgery with or without axillary lymph node dissection followed by radiotherapy in patients with clinically node-positive breast cancer (OPBC-03/SAKK 23/16/IBCSG 57-18/ABCSG-53/GBG-101-TAXIS).

TPS611 Background: Axillary lymph node dissection (ALND) is standard of care for most patients with clinically node-positive breast cancer (cN+BC), either in the adjuvant setting or in case of residual nodal disease after neoadjuvant chemotherapy (NACT). At least one quarter of patients with breast cancer experience long term morbidity after ALND. The TAXIS trial was designed to investigate if axillary radiotherapy (ART) can replace ALND in patients with cN+ BC who underwent tailored axillary surgery (TAS), which is recognized as one of the most important uncertainties and controversies in axillary management of patients with breast cancer. Methods: To test the remaining indications for ALND in clinical practice, we designed the international, multicenter, phase-III, non-inferiority, randomized controlled TAXIS trial to be pragmatic (average PRECIS-2 score of 4.44). Accordingly, most study domains follow usual care conditions, including eligibility (following routine indications for ALND in clinical practice), surgical skills and techniques, and follow up. The radiation oncology protocol included detailed recommendations and an extensive quality assurance program, which was developed to address the limitations of prior landmark trials and increase acceptability among recruiters. The main objective of the trial is to demonstrate that treatment with TAS and ART is non-inferior to TAS and ALND in terms of disease-free survival (DFS) of patients with cN+ BC detected by imaging or palpation in the upfront surgery setting or in case of residual disease after NACT. Randomization at a 1:1 ratio is mainly performed intraoperatively to either use TAS followed by ALND and regional nodal irradiation excluding the dissected axilla as a target volume (arm A) or to use TAS followed by regional nodal irradiation including the full axilla (arm B). The sample size is based on the primary endpoint DFS. With a type I error of 5% and a power of 80%, 385 events will be needed to show non-inferiority of TAS and axillary RT in comparison to ALND with a non-inferiority hazard ratio of 1.289 (corresponding to a DFS at 5 years of 80% in the ALND arm and 75% in the TAS and axillary RT arm). The sample size was calculated to be 1500 patients (750 per arm). Enrolment started in July 2018 and will stop after reaching 1500 patients, which is expected to be completed by Q4/2025. With currently 51 active sites from Europe, Canada and Korea within the network of the Oncoplastic Breast Consortium (OPBC), &gt;950 patients were randomized by January 2024. Another 14 sites in Europe, USA, and South America will join the trial in 2024. The interim analysis (after 20% of the required events) is expected for Q4/2024 and will be reviewed by the IDMC. The primary endpoint analysis is planned in Q4/2030. Clinical trial information: NCT03513614 .