Successful completion of large, low-cost randomized cancer trials at an academic cancer center.

BACKGROUND: Concerns about low accrual have long been a standard part of the discourse on cancer clinical trials, reaching even as far as the news media. Indeed, so many trials are closed before completing accrual that a cottage industry has recently developed creating statistical models to predict trial failure. We previously proposed four methodologic fixes for the current crisis in clinical trials: (1) dramatically reducing the number of eligibility criteria, (2) using data routinely collected in clinical practice for trial endpoints; then lowering barriers to accrual by (3) cluster randomization or (4) staged consent. METHODS: We report our practical experience of applying these fixes to randomized trials at Memorial Sloan Kettering Cancer Center. RESULTS: We have completed seven single-center randomized trials, with several more underway and accruing rapidly, with a total accrual approaching 10,000. Many of the trials have compared surgical interventions, an area where trials have traditionally been hard to complete. Only one of these trials was externally funded. While low costs were possible due to the existing research infrastructure at our institution, such infrastructure is common at major cancer centers. CONCLUSIONS: Further research on innovative clinical trial designs is warranted, particularly in higher-stakes settings, and in trials of medical and radiotherapy interventions.

Pelvic Lymph Node Dissection in Prostate Cancer: Update from a Randomized Clinical Trial of Limited Versus Extended Dissection.

BACKGROUND AND OBJECTIVE: Lymph node dissection (LND) has been standard in cancer surgery for more than a century, yet evidence from randomized trials showing a benefit is scarce. We conducted a clinically integrated randomized trial comparing limited versus extended pelvic LND (PLND) during radical prostatectomy and previously reported comparable biochemical recurrence (BCR) rates. We report updated BCR rates and compare rates of metastasis between the study arms. METHODS: Between October 2011 and March 2017, 1432 patients undergoing radical prostatectomy were enrolled at a single center. Surgeons were cluster randomized to perform limited (external iliac nodes) or extended PLND (external iliac, obturator, and hypogastric nodes) with crossover for 3-mo periods. Cox proportional-hazards regression with robust standard errors clustered by surgeon was used to assess whether the PLND template affected BCR or distant or locoregional metastasis. KEY FINDINGS AND LIMITATIONS: There were 452 BCR events at median follow-up of 4.2 yr for participants who did not develop BCR. The results confirm our previous finding of comparable BCR rates between the arms (hazard ratio [HR] 1.05, 95% confidence interval [CI] 0.97-1.13; p = 0.3). However, with 123 metastasis events and median follow-up of 5.4 yr for patients without metastasis, we found a clinically and statistically significant protective effect of extended PLND against metastasis (any metastasis: HR 0.82, 95% CI 0.71-0.93; p = 0.003; distant metastasis: HR 0.75, 95% CI 0.64-0.88; p < 0.001). CONCLUSIONS AND CLINICAL IMPLICATIONS: Patients undergoing radical prostatectomy should receive extended PLND that includes the external iliac, obturator, and hypogastric nodes. Further research should examine biological mechanisms regarding the anatomic location of affected nodes. Trials of LND for other cancers are warranted and should consider our clinically integrated design. This trial is registered on ClinicalTrials.gov as NCT01407263.

Testosterone Therapy in Men After Radical Prostatectomy for Organ-Confined, Low-Intermediate Prostate Cancer.

PURPOSE: Testosterone therapy (TTh) in men with T deficiency who have undergone radical prostatectomy (RP) for prostate cancer remains controversial. We aimed to assess the impact of TTh on biochemical recurrence (BCR) rates after RP in men with low-intermediate organ-confined disease. MATERIALS AND METHODS: This study included men who underwent an RP at our institution for organ-confined prostate cancer and had grade groups 1 to 3 on RP pathology. A Cox model was created for time to BCR with T use included as a time-dependent covariate, adjusted for age, preoperative PSA, grade group at RP, and the presence of comorbidities. A landmark analysis was used: Patients were included in the analysis if their last PSA in the 18 weeks postoperatively was undetectable and they had not had BCR or been lost to follow-up by that point, and follow-up for BCR began at 18 weeks. BCR was defined as a PSA ≥ 0.1 ng/mL after RP with a second confirmatory rise ≥ 0.1 ng/mL. RESULTS: The study population included 5199 men after RP, with 198 patients receiving T at any point after RP and 5001 not receiving T. The median age was 59 (IQR, 55-65) and 61 (IQR, 56-66) years, respectively. Men in the T group tended to present with more vascular comorbidities. For those receiving T, clomiphene citrate was prescribed in 49% of men, 32% received transdermal T, and 19% intramuscular T. We found a nonsignificantly decreased risk of BCR associated with the use of T after RP (HR, 0.84; 95% CI, 0.48-1.46; P = .5), and overall rates of BCR were low, with probability of BCR at 5 years less than 2% in both groups. CONCLUSIONS: TTh can be given to select men after RP. We found no evidence that administration of TTh after RP causes BCR.

Transperineal vs Transrectal Prostate Biopsy-The PREVENT Randomized Clinical Trial.

This randomized clinical trial compares the effect of transperineal vs transrectal prostate biopsy on infection rates after biopsy.

Oncologic Outcomes of Incidental Versus Biopsy-diagnosed Grade Group 1 Prostate Cancer: A Multi-institutional Study.

Background and objective: Patients diagnosed with grade group (GG) 1 prostate cancer (PCa) following treatment for benign disease ("incidental" PCa) are typically managed with active surveillance (AS). It is not known how their outcomes compare with those observed in patients diagnosed with GG1 on biopsy. We aimed at determining whether long-term oncologic outcomes of AS for patients with GG1 PCa differ according to the type of diagnosis: incidental versus biopsy detected. Methods: A retrospective, multi-institutional analysis of PCa patients with GG1 on AS at eight institutions was conducted. Competing risk analyses estimated the incidence of metastases, PCa mortality, and conversion to treatment. As a secondary analysis, we estimated the risk of GG ≥2 on the first follow-up biopsy according to the type of initial diagnosis. Key findings and limitations: A total of 213 versus 1900 patients with incidental versus biopsy-diagnosed GG1 were identified. Patients with incidental cancers were followed with repeated biopsies and multiparametric magnetic resonance imaging less frequently than those diagnosed on biopsy. The 10-yr incidence of treatment was 22% for incidental cancers versus 53% for biopsy (subdistribution hazard ratio [sHR] 0.34, 95% confidence interval [CI] 0.26-0.46, p < 0.001). Distant metastases developed in one patient with incidental cancer versus 17 diagnosed on biopsy and were diagnosed with molecular imaging in 13 (72%) patients. The 10-yr incidence of metastases was 0.8% for patients with incidental PCa and 2% for those diagnosed on biopsy (sHR 0.35, 95% CI 0.05-2.54, p = 0.3). The risk of GG ≥2 on the first follow-up biopsy was low if the initial diagnosis was incidental (7% vs 22%, p < 0.001). Conclusions and clinical implications: Patients with GG1 incidental PCa should be evaluated further to exclude aggressive disease, preferably with a biopsy. If no cancer is found on biopsy, then they should receive the same follow-up of a patient with a negative biopsy. Further research should confirm whether imaging and biopsies can be avoided if postoperative prostate-specific antigen is low (<1-2 ng/ml). Patient summary: We compared the outcomes of patients with low-grade prostate cancer on active surveillance according to the type of their initial diagnosis. Patients who have low-grade cancer diagnosed on a procedure to relieve urinary symptoms (incidental prostate cancer) are followed less intensively and undergo curative-intended treatment less frequently. We also found that patients with incidental prostate cancer are more likely to have no cancer on their first follow-up biopsy than patients who have low-grade cancer initially diagnosed on a biopsy. These patients have a more favorable prognosis than their biopsy-detected counterparts and should be managed the same way as patients with negative biopsies if they undergo a subsequent biopsy that shows no cancer.

Quantification of Gleason Pattern 4 Metrics Identifies Pathologic Progression in Patients With Grade Group 2 Prostate Cancer on Active Surveillance.

BACKGROUND: During active surveillance (AS) for Grade Group (GG) 2 prostate cancer, pathologic progression to GG3 on surveillance biopsy is a trigger for intervention. However, this ratio of GP3:GP4, may be obscured by increases of relatively indolent disease. We aimed to explore changes in GP4 quantity during AS and propose alternative definitions for progression based on GP4 changes. DESIGN, SETTING, AND PARTICIPANTS: We assessed patients enrolled on AS between November 2014 and March 2020 with GG2 disease on diagnostic biopsy and subsequent surveillance biopsy approximately 1 year later. Outcome measures included change in overall %GP4 and total length GP4 (mm). RESULTS AND LIMITATIONS: 61 patients met the inclusion criteria, the median change in total length of GP4 and %GP4 was -0.12 mm (IQR -0.31, 0.09) and -2.5% (IQR -8.6, 0.0), respectively. Excluding the 35 patients with no evidence of GP4 on surveillance biopsy, median change in total GP4 length and %GP4 was 0.19 mm (IQR -0.04, 0.67) and 1.2% (IQR -1.6, 6.6), respectively. Three patients progressed to GG3 disease on surveillance biopsy, one of whom had only a small increase in %GP4. Conversely, an additional 2 patients who did not meet the criterion for GG3 had a large increase (> 1 mm) in total GP4 length. CONCLUSIONS: Presence of GG3 disease on surveillance biopsy as a trigger for treatment in men on AS is of questionable use alone; we suggest including other measures that do not depend on a ratio, such as an increase in total GP4 length.

Clinical utility of an artificial intelligence radiomics-based tool for risk stratification of pulmonary nodules.

BACKGROUND: Clinical utility data on pulmonary nodule (PN) risk stratification biomarkers are lacking. We aimed to determine the incremental predictive value and clinical utility of using an artificial intelligence (AI) radiomics-based computer-aided diagnosis (CAD) tool in addition to routine clinical information to risk stratify PNs among real-world patients. METHODS: We performed a retrospective cohort study of patients with PNs who underwent lung biopsy. We collected clinical data and used a commercially available AI radiomics-based CAD tool to calculate a Lung Cancer Prediction (LCP) score. We developed logistic regression models to evaluate a well-validated clinical risk prediction model (the Mayo Clinic model) with and without the LCP score (Mayo vs Mayo + LCP) using area under the curve (AUC), risk stratification table, and standardized net benefit analyses. RESULTS: Among the 134 patients undergoing PN biopsy, cancer prevalence was 61%. Addition of the radiomics-based LCP score to the Mayo model was associated with increased predictive accuracy (likelihood ratio test, P = .012). The AUCs for the Mayo and Mayo + LCP models were 0.58 (95% CI = 0.48 to 0.69) and 0.65 (95% CI = 0.56 to 0.75), respectively. At the 65% risk threshold, the Mayo + LCP model was associated with increased sensitivity (56% vs 38%; P = .019), similar false positive rate (33% vs 35%; P = .8), and increased standardized net benefit (18% vs -3.3%) compared with the Mayo model. CONCLUSIONS: Use of a commercially available AI radiomics-based CAD tool as a supplement to clinical information improved PN cancer risk prediction and may result in clinically meaningful changes in risk stratification.

A Novel Frailty Index Can Predict the Short-Term Outcomes of Esophagectomy in Older Patients with Esophageal Cancer.

Background: Frailty, rather than age, is associated with postoperative morbidity and mortality. We sought to determine whether preoperative frailty as defined by a novel scoring system could predict the outcomes among older patients undergoing esophagectomy. Methods: We identified patients 65 years or older who underwent esophagectomy between 2011 and 2021 at our institution. Frailty was assessed using the MSK-FI, which consists of 1 component related to functional status and 10 medical comorbidities. We used a multivariable logistic regression model to test for the associations between frailty and short-term outcomes, with continuous frailty score as the predictor and additionally adjusted for age and Eastern Cooperative Oncology Group performance status. Results: In total, 447 patients were included in the analysis (median age of 71 years [interquartile range, 68-75]). Most of the patients underwent neoadjuvant treatment (81%), an Ivor Lewis esophagectomy (86%), and minimally invasive surgery (55%). A total of 22 patients (4.9%) died within 90 days of surgery, 144 (32%) had a major complication, 81 (19%) were readmitted, and 31 (7.2%) were discharged to a facility. Of the patients who died within 90 days, 19 had a major complication, yielding a failure-to-rescue rate of 13%. The risk of 30-day major complications (OR, 1.24 [95% CI, 1.09-1.41]; p = 0.001), readmissions (OR, 1.31 [95% CI, 1.13-1.52]; p < 0.001), and discharge to a facility (OR, 1.86 [95% CI, 1.49-2.37]; p < 0.001) increased with increasing frailty. Frailty and 90-day mortality were not associated. Conclusions: Frailty assessment during surgery decision-making can identify patients with a high risk of morbidity.

Randomized Trial of Transverse vs Vertical Extraction Site Incision After Robotic Radical Prostatectomy.

PURPOSE: Incisional hernias are a frequent complication following robotic radical prostatectomy. Observational data in men undergoing robotic prostatectomy suggest that transverse closure resulted in lower hernia rates than vertical closure. We sought to compare the incidence of incisional hernia after robotic radical prostatectomy after vertical and transverse extraction site closure. MATERIALS AND METHODS: We conducted a clinically integrated, crossover, cluster randomized trial at a single tertiary referral center (January 2016-September 2021) comparing the rate of hernia after transverse vs vertical extraction site excision in 1356 patients treated with minimally invasive radical prostatectomy. The primary outcome was between-group incidence of incisional hernia within 15 months of prostatectomy defined by physical examination and self-reported patient surveys. RESULTS: Overall, 197 (20%) patients developed an incisional hernia within 15 months, 797 did not have an incisional hernia within this period, and 362 had missing outcome data regarding incisional hernia. We found no significant difference in hernia rates between the 2 incision types (absolute between-group difference 1.8%; 95% CI -3.4%, 6.6%; P = .5) in the primary analysis or in the 3 sensitivity analyses. Notably, because of the inclusive definition of hernia used, these data cannot be used as an estimate of the true prevalence of incisional hernia. CONCLUSIONS: Surgeons should choose the incision and closure approach they are most comfortable with when extracting specimens. Studies of modifications to the surgical technique are best conducted as randomized comparisons, and the clinically integrated, crossover, cluster randomized trial allows large trials to be completed at a single center and at low cost. TRIAL REGISTRATION: ClinicalTrials.gov: NCT01407263.

Association between objective measures of oral health and salivary gland irradiation with patient-reported outcomes following head and neck radiation therapy.

PURPOSE: To determine whether objective measures of oral health and salivary gland irradiation correlates with subjective measures of eating, drinking, and salivation in patients following head and neck radiation therapy (HNRT). METHODS: This cross-sectional study included 112 patients following HNRT with a completed patient-reported outcome (PRO) scale. Objective measures at post-HNRT visit included decayed-missing-filled teeth (DMFT) scores, periodontal disease condition, oral hygiene status, dental prosthesis use, and prescribed radiation dose to salivary glands. Data were collected and statistical analysis was performed. RESULTS: There was no significant association between PRO scales and dental prosthesis use, periodontal disease, and oral hygiene. Although some significant findings were seen with DMFT and prescribed radiation dose to salivary glands, this explained only very small amounts of the variation in eating, drinking, and salivation measures in these patients. CONCLUSION: PRO measures should be integrated in the routine care of patients with head and neck cancer.

Optimizing accrual to a large-scale, clinically integrated randomized trial in anesthesiology: A 2-year analysis of recruitment.

BACKGROUND: Performing large randomized trials in anesthesiology is often challenging and costly. The clinically integrated randomized trial is characterized by simplified logistics embedded into routine clinical practice, enabling ease and efficiency of recruitment, offering an opportunity for clinicians to conduct large, high-quality randomized trials under low cost. Our aims were to (1) demonstrate the feasibility of the clinically integrated trial design in a high-volume anesthesiology practice and (2) assess whether trial quality improvement interventions led to more balanced accrual among study arms and improved trial compliance over time. METHODS: This is an interim analysis of recruitment to a cluster-randomized trial investigating three nerve block approaches for mastectomy with immediate implant-based reconstruction: paravertebral block (arm 1), paravertebral plus interpectoral plane blocks (arm 2), and serratus anterior plane plus interpectoral plane blocks (arm 3). We monitored accrual and consent rates, clinician compliance with the randomized treatment, and availability of outcome data. Assessment after the initial year of implementation showed a slight imbalance in study arms suggesting areas for improvement in trial compliance. Specific improvement interventions included increasing the frequency of communication with the consenting staff and providing direct feedback to clinician investigators about their individual recruitment patterns. We assessed overall accrual rates and tested for differences in accrual, consent, and compliance rates pre- and post-improvement interventions. RESULTS: Overall recruitment was extremely high, accruing close to 90% of the eligible population. In the pre-intervention period, there was evidence of bias in the proportion of patients being accrued and receiving the monthly block, with higher rates in arm 3 (90%) compared to arms 1 (81%) and 2 (79%, p = 0.021). In contrast, in the post-intervention period, there was no statistically significant difference between groups (p = 0.8). Eligible for randomization rate increased from 89% in the pre-intervention period to 95% in the post-intervention period (difference 5.7%; 95% confidence interval = 2.2%-9.4%, p = 0.002). Consent rate increased from 95% to 98% (difference of 3.7%; 95% confidence interval = 1.1%-6.3%; p = 0.004). Compliance with the randomized nerve block approach was maintained at close to 100% and availability of primary outcome data was 100%. CONCLUSION: The clinically integrated randomized trial design enables rapid trial accrual with a high participant compliance rate in a high-volume anesthesiology practice. Continuous monitoring of accrual, consent, and compliance rates is necessary to maintain and improve trial conduct and reduce potential biases. This trial methodology serves as a template for the implementation of other large, low-cost randomized trials in anesthesiology.

Gabapentin and Rapidity of Recovery Among Patients Undergoing Minimally Invasive Ambulatory Uro-Oncologic Surgeries.

INTRODUCTION: Gabapentin has been used in enhanced recovery after surgery (ERAS) pathways for pain control for patients undergoing ambulatory uro-oncologic surgery; however, it may cause undesirable side effects. We studied the causal association between gabapentin and rapidity of recovery and perioperative pain management after minimally invasive uro-oncologic surgery. METHODS: We identified 2397 patients ≤ 65 years undergoing prostatectomies or nephrectomies between 2018 and 2022; 131 (5.5%) did not receive gabapentin. We tested the effect of gabapentin use on time of discharge and perioperative opioid consumption, respectively, using multivariable linear regression adjusting for potential confounders including age, gender, BMI, American Society of Anesthesiologists score, and surgery type. RESULTS: On adjusted analysis, we found no evidence of a difference in discharge time among those who did vs did not receive gabapentin (adjusted difference 0.07 hours shorter on gabapentin; 95% CI -0.17, 0.31; P = .6). There was no evidence of a difference in intraoperative opioid consumption by gabapentin receipt (adjusted difference -1.5 morphine milligram equivalents; 95% CI -4.2, 1.1; P = .3) or probability of being in the top quartile of postoperative opioid consumption within 24 hours (adjusted difference 4.2%; 95% CI -4.8%, 13%; P = .4). We saw no important differences in confounders by gabapentin receipt suggesting causal conclusions are justified. CONCLUSIONS: Our confidence intervals did not include clinically meaningful benefits from gabapentin, when used with an ERAS protocol, in terms of length of stay or perioperative opioid use. These results support the omission of gabapentin from ERAS protocols for minimally invasive uro-oncologic surgeries.

Comparing Clinician Estimates versus a Statistical Tool for Predicting Risk of Death within 45 Days of Admission for Cancer Patients.

OBJECTIVES: While clinical practice guidelines recommend that oncologists discuss goals of care with patients who have advanced cancer, it is estimated that less than 20% of individuals admitted to the hospital with high-risk cancers have end-of-life discussions with their providers. While there has been interest in developing models for mortality prediction to trigger such discussions, few studies have compared how such models compare with clinical judgment to determine a patient's mortality risk. METHODS: This study is a prospective analysis of 1,069 solid tumor medical oncology hospital admissions (n = 911 unique patients) from February 7 to June 7, 2022, at Memorial Sloan Kettering Cancer Center. Electronic surveys were sent to hospitalists, advanced practice providers, and medical oncologists the first afternoon following a hospital admission and they were asked to estimate the probability that the patient would die within 45 days. Provider estimates of mortality were compared with those from a predictive model developed using a supervised machine learning methodology, and incorporated routine laboratory, demographic, biometric, and admission data. Area under the receiver operating characteristic curve (AUC), calibration and decision curves were compared between clinician estimates and the model predictions. RESULTS: Within 45 days following hospital admission, 229 (25%) of 911 patients died. The model performed better than the clinician estimates (AUC 0.834 vs. 0.753, p < 0.0001). Integrating clinician predictions with the model's estimates further increased the AUC to 0.853 (p < 0.0001). Clinicians overestimated risk whereas the model was extremely well-calibrated. The model demonstrated net benefit over a wide range of threshold probabilities. CONCLUSION: The inpatient prognosis at admission model is a robust tool to assist clinical providers in evaluating mortality risk, and it has recently been implemented in the electronic medical record at our institution to improve end-of-life care planning for hospitalized cancer patients.

CD4 T cells and CD8α+ lymphocytes are necessary for intravenous BCG-induced protection against tuberculosis in macaques.

Tuberculosis (TB) is a major cause of morbidity and mortality worldwide despite widespread intradermal (ID) BCG vaccination in newborns. We previously demonstrated that changing the route and dose of BCG vaccination from 5×105 CFU ID to 5×107 CFU intravenous (IV) resulted in prevention of infection and disease in a rigorous, highly susceptible non-human primate model of TB. Identifying the immune mechanisms of protection for IV BCG will facilitate development of more effective vaccines against TB. Here, we depleted select lymphocyte subsets in IV BCG vaccinated macaques prior to Mtb challenge to determine the cell types necessary for that protection. Depletion of CD4 T cells or all CD8α expressing lymphoycytes (both innate and adaptive) resulted in loss of protection in most macaques, concomitant with increased bacterial burdens (~4-5 log10 thoracic CFU) and dissemination of infection. In contrast, depletion of only adaptive CD8αß+ T cells did not significantly reduce protection against disease. Our results demonstrate that CD4 T cells and innate CD8α+ lymphocytes are critical for IV BCG-induced protection, supporting investigation of how eliciting these cells and their functions can improve future TB vaccines.

Identification of bacterial determinants of tuberculosis infection and treatment outcomes: a phenogenomic analysis of clinical strains.

BACKGROUND: Bacterial diversity could contribute to the diversity of tuberculosis infection and treatment outcomes observed clinically, but the biological basis of this association is poorly understood. The aim of this study was to identify associations between phenogenomic variation in Mycobacterium tuberculosis and tuberculosis clinical features. METHODS: We developed a high-throughput platform to define phenotype-genotype relationships in M tuberculosis clinical isolates, which we tested on a set of 158 drug-sensitive M tuberculosis strains sampled from a large tuberculosis clinical study in Ho Chi Minh City, Viet Nam. We tagged the strains with unique genetic barcodes in multiplicate, allowing us to pool the strains for in-vitro competitive fitness assays across 16 host-relevant antibiotic and metabolic conditions. Relative fitness was quantified by deep sequencing, enumerating output barcode read counts relative to input normalised values. We performed a genome-wide association study to identify phylogenetically linked and monogenic mutations associated with the in-vitro fitness phenotypes. These genetic determinants were further associated with relevant clinical outcomes (cavitary disease and treatment failure) by calculating odds ratios (ORs) with binomial logistic regressions. We also assessed the population-level transmission of strains associated with cavitary disease and treatment failure using terminal branch length analysis of the phylogenetic data. FINDINGS: M tuberculosis clinical strains had diverse growth characteristics in host-like metabolic and drug conditions. These fitness phenotypes were highly heritable, and we identified monogenic and phylogenetically linked variants associated with the fitness phenotypes. These data enabled us to define two genetic features that were associated with clinical outcomes. First, mutations in Rv1339, a phosphodiesterase, which were associated with slow growth in glycerol, were further associated with treatment failure (OR 5·34, 95% CI 1·21-23·58, p=0·027). Second, we identified a phenotypically distinct slow-growing subclade of lineage 1 strains (L1.1.1.1) that was associated with cavitary disease (OR 2·49, 1·11-5·59, p=0·027) and treatment failure (OR 4·76, 1·53-14·78, p=0·0069), and which had shorter terminal branch lengths on the phylogenetic tree, suggesting increased transmission. INTERPRETATION: Slow growth under various antibiotic and metabolic conditions served as in-vitro intermediate phenotypes underlying the association between M tuberculosis monogenic and phylogenetically linked mutations and outcomes such as cavitary disease, treatment failure, and transmission potential. These data suggest that M tuberculosis growth regulation is an adaptive advantage for bacterial success in human populations, at least in some circumstances. These data further suggest markers for the underlying bacterial processes that contribute to these clinical outcomes. FUNDING: National Health and Medical Research Council/A∗STAR, National Institutes of Allergy and Infectious Diseases, National Institute of Child Health and Human Development, and the Wellcome Trust Fellowship in Public Health and Tropical Medicine.

Transfers and anesthesia-related postoperative outcomes after 3361 same-day cancer surgeries at a freestanding surgery center: An observational retrospective study.

BACKGROUND AND OBJECTIVES: Expanding outpatient surgery to the increasing number of procedures and patient populations warrants continuous evaluation of postoperative outcomes to ensure the best care and safety. We describe adverse postoperative outcomes and transfer rates related to anesthesia in a large sample of patients who underwent same-day cancer surgery at a freestanding ambulatory surgery center. METHODS: Between January 2017 and June 2021, 3361 cancer surgeries, including breast and plastic, head and neck, gynecology, and urology, were performed. The surgeries were indicated for diagnosis, staging, and/or treatment. We report the incidence of transfers and adverse postoperative outcomes related to anesthesia. RESULTS: Breast and plastic surgeries were the most common (1771, 53%), followed by urology (1052, 31%), gynecology (410, 12%), and head and neck surgeries (128, 4%). Based on patients' first procedure, comorbidity levels were highest for urology (75% American Society of Anesthesiologists physical status score 3, 1.7% score 4) and lowest for breast surgeries (31% score 3, 0.2% score 4). Most gynecology surgeries used general anesthesia (97.6%), whereas breast surgeries used the least (38%). A total of seven patients (0.2%; 95% CI: 0.08%-0.4%) were immediately transferred to an outside hospital; four due to anesthesia-related reasons. Only 7 (0.2%) patients needed additional postoperative care related to anesthesia-related adverse events, specifically cardiac events (4), difficult intubations (2), desaturation (1), and agitation, nausea, and headache (1). CONCLUSIONS: The incidence of anesthesia-related adverse postoperative outcomes is low in cancer patients undergoing outpatient surgeries at our freestanding ambulatory surgery center. This suggests that carefully selected cancer patients, including patients with metastatic cancer, can undergo anesthesia for same-day surgery, making cancer care accessible locally and reducing stress associated with travel for treatment. More research investigating complication rates related to surgery and to cancer disease trajectory are needed to establish a complete evaluation of safety for outpatient cancer surgery.