South Dakota is currently home to 329 active clinical trials, seeking participants for engagement in research studies. These trials take place at a variety of cities in the state, including Sioux Falls, Rapid City, Aberdeen and Watertown. Whether you're a healthy volunteer interested in paid medical research or someone seeking trials related to a specific condition, the state offers a diverse array of opportunities in your vicinity.
A Study of Vedolizumab With and Without Upadacitinib in Adults With Crohn's Disease
Recruiting
The main aim of this study is to learn whether vedolizumab and upadacitinib given together (also called dual targeted therapy or DTT) reduces bowel inflammation and ulcers in the bowel compared to vedolizumab only (also called monotherapy) in adults with moderately or severely active Crohn's Disease (CD) after 12 weeks of treatment. Other aims are to learn how safe and effective DTT is compared to monotherapy for these participants. All participants will receive DTT (either vedolizumab and upad... Read More
Gender:
ALL
Ages:
Between 18 years and 65 years
Trial Updated:
05/28/2025
Locations: Rapid City Medical Center, Rapid City, South Dakota
Conditions: Crohn's Disease
Rare Disease Patient Registry & Natural History Study - Coordination of Rare Diseases at Sanford
Recruiting
CoRDS, or the Coordination of Rare Diseases at Sanford, is based at Sanford Research in Sioux Falls, South Dakota. It provides researchers with a centralized, international patient registry for all rare diseases. This program allows patients and researchers to connect as easily as possible to help advance treatments and cures for rare diseases. The CoRDS team works with patient advocacy groups, individuals and researchers to help in the advancement of research in over 7,000 rare diseases. The re... Read More
Gender:
ALL
Ages:
All
Trial Updated:
05/22/2025
Locations: Sanford Health, Sioux Falls, South Dakota
Conditions: Rare Disorders, Undiagnosed Disorders, Disorders of Unknown Prevalence, Cornelia De Lange Syndrome, Prenatal Benign Hypophosphatasia, Perinatal Lethal Hypophosphatasia, Odontohypophosphatasia, Adult Hypophosphatasia, Childhood-onset Hypophosphatasia, Infantile Hypophosphatasia, Hypophosphatasia, Kabuki Syndrome, Bohring-Opitz Syndrome, Narcolepsy Without Cataplexy, Narcolepsy-cataplexy, Hypersomnolence Disorder, Idiopathic Hypersomnia Without Long Sleep Time, Idiopathic Hypersomnia With Long Sleep Time, Idiopathic Hypersomnia, Kleine-Levin Syndrome, Kawasaki Disease, Leiomyosarcoma, Leiomyosarcoma of the Corpus Uteri, Leiomyosarcoma of the Cervix Uteri, Leiomyosarcoma of Small Intestine, Acquired Myasthenia Gravis, Addison Disease, Hyperacusis (Hyperacousis), Juvenile Myasthenia Gravis, Transient Neonatal Myasthenia Gravis, Williams Syndrome, Lyme Disease, Myasthenia Gravis, Marinesco Sjogren Syndrome(Marinesco-Sjogren Syndrome), Isolated Klippel-Feil Syndrome, Frasier Syndrome, Denys-Drash Syndrome, Beckwith-Wiedemann Syndrome, Emanuel Syndrome, Isolated Aniridia, Axenfeld-Rieger Syndrome, Aniridia-intellectual Disability Syndrome, Aniridia - Renal Agenesis - Psychomotor Retardation, Aniridia - Ptosis - Intellectual Disability - Familial Obesity, Aniridia - Cerebellar Ataxia - Intellectual Disability, Aniridia - Absent Patella, Aniridia, Peters Anomaly - Cataract, Peters Anomaly, Potocki-Shaffer Syndrome, Silver-Russell Syndrome Due to Maternal Uniparental Disomy of Chromosome 11, Silver-Russell Syndrome Due to Imprinting Defect of 11p15, Silver-Russell Syndrome Due to 11p15 Microduplication, Syndromic Aniridia, WAGR Syndrome, Wolf-Hirschhorn Syndrome, 4p16.3 Microduplication Syndrome, 4p Deletion Syndrome, Non-Wolf-Hirschhorn Syndrome, Autosomal Recessive Stickler Syndrome, Stickler Syndrome Type 2, Stickler Syndrome Type 1, Stickler Syndrome, Mucolipidosis Type 4, X-linked Spinocerebellar Ataxia Type 4, X-linked Spinocerebellar Ataxia Type 3, X-linked Intellectual Disability - Ataxia - Apraxia, X-linked Progressive Cerebellar Ataxia, X-linked Non Progressive Cerebellar Ataxia, X-linked Cerebellar Ataxia, Vitamin B12 Deficiency Ataxia, Toxic Exposure Ataxia, Unclassified Autosomal Dominant Spinocerebellar Ataxia, Thyroid Antibody Ataxia, Sporadic Adult-onset Ataxia of Unknown Etiology, Spinocerebellar Ataxia With Oculomotor Anomaly, Spinocerebellar Ataxia With Epilepsy, Spinocerebellar Ataxia With Axonal Neuropathy Type 2, Spinocerebellar Ataxia Type 8, Spinocerebellar Ataxia Type 7, Spinocerebellar Ataxia Type 6, Spinocerebellar Ataxia Type 5, Spinocerebellar Ataxia Type 4, Spinocerebellar Ataxia Type 37, Spinocerebellar Ataxia Type 36, Spinocerebellar Ataxia Type 35, Spinocerebellar Ataxia Type 34, Spinocerebellar Ataxia Type 32, Spinocerebellar Ataxia Type 31, Spinocerebellar Ataxia Type 30, Spinocerebellar Ataxia Type 3, Spinocerebellar Ataxia Type 29, Spinocerebellar Ataxia Type 28, Spinocerebellar Ataxia Type 27, Spinocerebellar Ataxia Type 26, Spinocerebellar Ataxia Type 25, Spinocerebellar Ataxia Type 23, Spinocerebellar Ataxia Type 22, Spinocerebellar Ataxia Type 21, Spinocerebellar Ataxia Type 20, Spinocerebellar Ataxia Type 2, Spinocerebellar Ataxia Type 19/22, Spinocerebellar Ataxia Type 18, Spinocerebellar Ataxia Type 17, Spinocerebellar Ataxia Type 16, Spinocerebellar Ataxia Type 15/16, Spinocerebellar Ataxia Type 14, Spinocerebellar Ataxia Type 13, Spinocerebellar Ataxia Type 12, Spinocerebellar Ataxia Type 11, Spinocerebellar Ataxia Type 10, Spinocerebellar Ataxia Type 1 With Axonal Neuropathy, Spinocerebellar Ataxia Type 1, Spinocerebellar Ataxia - Unknown, Spinocerebellar Ataxia - Dysmorphism, Non Progressive Epilepsy and/or Ataxia With Myoclonus as a Major Feature, Spasticity-ataxia-gait Anomalies Syndrome, Spastic Ataxia With Congenital Miosis, Spastic Ataxia - Corneal Dystrophy, Spastic Ataxia, Rare Hereditary Ataxia, Rare Ataxia, Recessive Mitochondrial Ataxia Syndrome, Progressive Epilepsy and/or Ataxia With Myoclonus as a Major Feature, Posterior Column Ataxia - Retinitis Pigmentosa, Post-Stroke Ataxia, Post-Head Injury Ataxia, Post Vaccination Ataxia, Polyneuropathy - Hearing Loss - Ataxia - Retinitis Pigmentosa - Cataract, Muscular Atrophy - Ataxia - Retinitis Pigmentosa - Diabetes Mellitus, Non-hereditary Degenerative Ataxia, Paroxysmal Dystonic Choreathetosis With Episodic Ataxia and Spasticity, Olivopontocerebellar Atrophy - Deafness, NARP Syndrome, Myoclonus - Cerebellar Ataxia - Deafness, Multiple System Atrophy, Parkinsonian Type, Multiple System Atrophy, Cerebellar Type, Multiple System Atrophy, Maternally-inherited Leigh Syndrome, Machado-Joseph Disease Type 3, Machado-Joseph Disease Type 2, Machado-Joseph Disease Type 1, Leigh Syndrome, Late-onset Ataxia With Dementia, Infection or Post Infection Ataxia, GAD Ataxia, Hereditary Episodic Ataxia, Gliadin/Gluten Ataxia, Friedreich Ataxia, Fragile X-associated Tremor/Ataxia Syndrome, Familial Paroxysmal Ataxia, Exposure to Medications Ataxia, Episodic Ataxia With Slurred Speech, Episodic Ataxia Unknown Type, Episodic Ataxia Type 7, Episodic Ataxia Type 6, Episodic Ataxia Type 5, Episodic Ataxia Type 4, Episodic Ataxia Type 3, Episodic Ataxia Type 1, Epilepsy and/or Ataxia With Myoclonus as Major Feature, Early-onset Spastic Ataxia-neuropathy Syndrome, Early-onset Progressive Neurodegeneration - Blindness - Ataxia - Spasticity, Early-onset Cerebellar Ataxia With Retained Tendon Reflexes, Early-onset Ataxia With Dementia, Childhood-onset Autosomal Recessive Slowly Progressive Spinocerebellar Ataxia, Dilated Cardiomyopathy With Ataxia, Cataract - Ataxia - Deafness, Cerebellar Ataxia, Cayman Type, Cerebellar Ataxia With Peripheral Neuropathy, Cerebellar Ataxia - Hypogonadism, Cerebellar Ataxia - Ectodermal Dysplasia, Cerebellar Ataxia - Areflexia - Pes Cavus - Optic Atrophy - Sensorineural Hearing Loss, Brain Tumor Ataxia, Brachydactyly - Nystagmus - Cerebellar Ataxia, Benign Paroxysmal Tonic Upgaze of Childhood With Ataxia, Autosomal Recessive Syndromic Cerebellar Ataxia, Autosomal Recessive Spastic Ataxia With Leukoencephalopathy, Autosomal Recessive Spastic Ataxia of Charlevoix-Saguenay, Autosomal Recessive Spastic Ataxia - Optic Atrophy - Dysarthria, Autosomal Recessive Spastic Ataxia, Autosomal Recessive Metabolic Cerebellar Ataxia, Autosomal Dominant Spinocerebellar Ataxia Due to Repeat Expansions That do Not Encode Polyglutamine, Autosomal Recessive Ataxia, Beauce Type, Autosomal Recessive Ataxia Due to Ubiquinone Deficiency, Autosomal Recessive Ataxia Due to PEX10 Deficiency, Autosomal Recessive Degenerative and Progressive Cerebellar Ataxia, Autosomal Recessive Congenital Cerebellar Ataxia Due to MGLUR1 Deficiency, Autosomal Recessive Congenital Cerebellar Ataxia Due to GRID2 Deficiency, Autosomal Recessive Congenital Cerebellar Ataxia, Autosomal Recessive Cerebellar Ataxia-pyramidal Signs-nystagmus-oculomotor Apraxia Syndrome, Autosomal Recessive Cerebellar Ataxia-epilepsy-intellectual Disability Syndrome Due to WWOX Deficiency, Autosomal Recessive Cerebellar Ataxia-epilepsy-intellectual Disability Syndrome Due to TUD Deficiency, Autosomal Recessive Cerebellar Ataxia-epilepsy-intellectual Disability Syndrome Due to KIAA0226 Deficiency, Autosomal Recessive Cerebellar Ataxia-epilepsy-intellectual Disability Syndrome, Autosomal Recessive Cerebellar Ataxia With Late-onset Spasticity, Autosomal Recessive Cerebellar Ataxia Due to STUB1 Deficiency, Autosomal Recessive Cerebellar Ataxia Due to a DNA Repair Defect, Autosomal Recessive Cerebellar Ataxia - Saccadic Intrusion, Autosomal Recessive Cerebellar Ataxia - Psychomotor Retardation, Autosomal Recessive Cerebellar Ataxia - Blindness - Deafness, Autosomal Recessive Cerebellar Ataxia, Autosomal Dominant Spinocerebellar Ataxia Due to a Polyglutamine Anomaly, Autosomal Dominant Spinocerebellar Ataxia Due to a Point Mutation, Autosomal Dominant Spinocerebellar Ataxia Due to a Channelopathy, Autosomal Dominant Spastic Ataxia Type 1, Autosomal Dominant Spastic Ataxia, Autosomal Dominant Optic Atrophy, Ataxia-telangiectasia Variant, Ataxia-telangiectasia, Autosomal Dominant Cerebellar Ataxia, Deafness and Narcolepsy, Autosomal Dominant Cerebellar Ataxia Type 4, Autosomal Dominant Cerebellar Ataxia Type 3, Autosomal Dominant Cerebellar Ataxia Type 2, Autosomal Dominant Cerebellar Ataxia Type 1, Autosomal Dominant Cerebellar Ataxia, Ataxia-telangiectasia-like Disorder, Ataxia With Vitamin E Deficiency, Ataxia With Dementia, Ataxia - Oculomotor Apraxia Type 1, Ataxia - Other, Ataxia - Genetic Diagnosis - Unknown, Acquired Ataxia, Adult-onset Autosomal Recessive Cerebellar Ataxia, Alcohol Related Ataxia, Multiple Endocrine Neoplasia, Multiple Endocrine Neoplasia Type II, Multiple Endocrine Neoplasia Type 1, Multiple Endocrine Neoplasia Type 2, Multiple Endocrine Neoplasia, Type IV, Multiple Endocrine Neoplasia, Type 3, Multiple Endocrine Neoplasia (MEN) Syndrome, Multiple Endocrine Neoplasia Type 2B, Multiple Endocrine Neoplasia Type 2A, Atypical Hemolytic Uremic Syndrome, Atypical HUS, Wiedemann-Steiner Syndrome, Breast Implant-Associated Anaplastic Large Cell Lymphoma, Autoimmune/Inflammatory Syndrome Induced by Adjuvants (ASIA), Hemophagocytic Lymphohistiocytosis, Alagille Syndrome, Inclusion Body Myopathy With Early-onset Paget Disease and Frontotemporal Dementia (IBMPFD), Lowe Syndrome, Pitt Hopkins Syndrome, 1p36 Deletion Syndrome, Jansen Type Metaphyseal Chondrodysplasia, Cockayne Syndrome, Chronic Recurrent Multifocal Osteomyelitis, CRMO, Malan Syndrome, Hereditary Sensory and Autonomic Neuropathy Type Ie, VCP Disease, Hypnic Jerking, Sleep Myoclonus, Mollaret Meningitis, Recurrent Viral Meningitis, CRB1, Leber Congenital Amaurosis, Retinitis Pigmentosa, Rare Retinal Disorder, KCNMA1-Channelopathy, Primary Biliary Cirrhosis, ZMYND11, Transient Global Amnesia, Glycogen Storage Disease, Alstrom Syndrome, White Sutton Syndrome, DNM1, EIEE31, Myhre Syndrome, Recurrent Respiratory Papillomatosis, Laryngeal Papillomatosis, Tracheal Papillomatosis, Refsum Disease, Nicolaides Baraitser Syndrome, Leukodystrophy, Tango2, Cauda Equina Syndrome, Rare Gastrointestinal Disorders, Achalasia-Addisonian Syndrome, Achalasia Cardia, Achalasia Icrocephaly Syndrome, Anal Fistula, Congenital Sucrase-Isomaltase Deficiency, Eosinophilic Gastroenteritis, Idiopathic Gastroparesis, Hirschsprung Disease, Rare Inflammatory Bowel Disease, Intestinal Pseudo-Obstruction, Scleroderma, Short Bowel Syndrome, Sacral Agenesis, Sacral Agenesis Syndrome, Caudal Regression, Scheuermann Disease, SMC1A Truncated Mutations (Causing Loss of Gene Function), Cystinosis, Juvenile Nephropathic Cystinosis, Nephropathic Cystinosis, Kennedy Disease, Spinal Bulbar Muscular Atrophy, Warburg Micro Syndrome, Mucolipidoses, Mitochondrial Diseases, Mitochondrial Aminoacyl-tRNA Synthetases, Mt-aaRS Disorders, Hypertrophic Olivary Degeneration, Non-Ketotic Hyperglycinemia, Fish Odor Syndrome, Halitosis, Isolated Congenital Asplenia, Lambert Eaton (LEMS), Biliary Atresia, STAG1 Gene Mutation, Coffin Lowry Syndrome, Borjeson-Forssman-Lehman Syndrome, Blau Syndrome, Arginase 1 Deficiency, HSPB8 Myopathy, Beta-Mannosidosis, TBX4 Syndrome, DHDDS Gene Mutations, MAND-MBD5-Associated Neurodevelopmental Disorder, Constitutional Mismatch Repair Deficiency (CMMRD), SPATA5 Disorder, SPATA5L1 Related Disorder, Behcet's Disease, Acrodysostosis, Multi-systematic Smooth Muscle Dysfunction Syndrome, CRELD1 (Cysteine Rich With EGF Like Domains 1), GNB1 Syndrome, Pyruvate Dehydrogenase Complex Deficiency Disease, Beta Mannosidosis, Kbg Syndrome, Labrune Syndrome, Metachromatic Leukodystrophy (MLD), Moyamoya Disease, OPHN1 Syndrome, Oculopharyngeal Muscular Dystrophy (OPMD), TUBB3 Mutation, WOREE (WWOX-related Epileptic Encephalopathy, SCAR12, Skraban-Deardorff Syndrome, Hereditary Myopathy With Early Respiratory Failure
To Evaluate Efficacy and Safety of Serplulimab + Chemotherapy (Carboplatin- Etoposide) in US Patients With ES-SCLC
Recruiting
This is a randomized, open-label study of Serplulimab plus chemotherapy (Carboplatin-Etoposide) in comparison with Atezolizumab plus chemotherapy in previously untreated US patients with ES-SCLC. Subjects in this study will be randomized to arm A or B at 1:1 ratio as follows: * Arm A (Serplulimab): Serplulimab + chemotherapy (carboplatin-etoposide) * Arm B (control): Atezolizumab + chemotherapy (carboplatin-etoposide)
Gender:
ALL
Ages:
18 years and above
Trial Updated:
05/22/2025
Locations: Monument Health, Rapid City, South Dakota
Conditions: Extensive Stage Small Cell Lung Cancer
S1827 (MAVERICK) Testing Whether the Use of Brain Scans Alone Instead of Brain Scans Plus Preventive Brain Radiation Affects Lifespan in Patients With Small Cell Lung Cancer
Recruiting
This phase III trial studies magnetic resonance imaging (MRI) surveillance and prophylactic cranial irradiation (PCI) to see how well they work compared to MRI surveillance alone in treating patients with small cell lung cancer. MRI scans are used to monitor the possible spread of the cancer with an MRI machine over time. PCI is radiation therapy that is delivered to the brain in hopes of preventing spread of cancer into the brain. The use of brain MRI alone may reduce side effects of receiving... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
05/20/2025
Locations: Avera Cancer Institute at Pierre, Pierre, South Dakota
Conditions: Extensive Stage Lung Small Cell Carcinoma, Limited Stage Lung Small Cell Carcinoma, Lung Small Cell Carcinoma
A Study to Compare Two Surgical Procedures in Individuals With BRCA1 Mutations to Assess Reduced Risk of Ovarian Cancer
Recruiting
This clinical trial evaluates how well two surgical procedures (bilateral salpingectomy and bilateral salpingo-oophorectomy) work in reducing the risk of ovarian cancer for individuals with BRCA1 mutations. Bilateral salpingectomy involves the surgical removal of fallopian tubes, and bilateral salpingo-oophorectomy involves the surgical removal of both the fallopian tubes and ovaries. This study may help doctors determine if the two surgical procedures are nearly the same for ovarian cancer risk... Read More
Gender:
FEMALE
Ages:
Between 35 years and 50 years
Trial Updated:
05/15/2025
Locations: Sanford Cancer Center Oncology Clinic, Sioux Falls, South Dakota
Conditions: Ovarian Carcinoma
Testing Olaparib for One or Two Years, With or Without Bevacizumab, to Treat Ovarian Cancer
Recruiting
This phase III trial compares the effect of olaparib for one year versus two years, with or without bevacizumab, for the treatment of BRCA 1/2 mutated or homologous recombination deficient stage III or IV ovarian cancer. Olaparib is a polyadenosine 5'-diphosphoribose polymerase (PARP) enzyme inhibitor and may stop the growth of tumor cells by blocking some of the enzymes needed for cell growth. Bevacizumab is in a class of medications called antiangiogenic agents. It works by stopping the format... Read More
Gender:
ALL
Ages:
18 years and above
Trial Updated:
05/15/2025
Locations: Avera Cancer Institute-Aberdeen, Aberdeen, South Dakota
Conditions: Fallopian Tube Endometrioid Adenocarcinoma, Fallopian Tube High Grade Serous Adenocarcinoma, FIGO Stage III Ovarian Cancer 2014, FIGO Stage IV Ovarian Cancer 2014, Ovarian Carcinoma, Primary Peritoneal Endometrioid Adenocarcinoma, Primary Peritoneal High Grade Serous Adenocarcinoma, Ovarian High Grade Serous Adenocarcinoma, Ovarian High Grade Endometrioid Adenocarcinoma
S1501 Carvedilol in Preventing Cardiac Toxicity in Patients With Metastatic HER-2-Positive Breast Cancer
Recruiting
This phase III trial studies how well carvedilol works in preventing cardiac toxicity in patients with human epidermal growth factor receptor (HER)-2-positive breast cancer that has spread to other places in the body. A beta-blocker, such as carvedilol, is used to treat heart failure and high blood pressure, and it may prevent the heart from side effects of chemotherapy.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
05/12/2025
Locations: Sanford Cancer Center Oncology Clinic, Sioux Falls, South Dakota
Conditions: Cardiotoxicity, HER2/Neu Positive, Metastatic Malignant Neoplasm in the Brain, Recurrent Breast Carcinoma, Stage IV Breast Cancer AJCC v6 and v7
A Phase 1-2 of ST316 With Selected Advanced Unresectable and Metastatic Solid Tumors
Recruiting
This is an open-label, two-part, phase 1-2 study designed to determine the safety, tolerability, PK, pharmacodynamics (PD), and proof-of-concept efficacy of ST316 administered IV in subjects with selected advanced solid tumors likely to harbor abnormalities of the WNT/β-catenin signaling pathway. The study consists of two phases: a phase 1 dose escalation/regimen exploration phase and a phase 2 expansion phase.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
05/06/2025
Locations: Sanford Cancer Center, Sioux Falls, South Dakota
Conditions: Colon Cancer, Metastatic Colon Cancer
Cognitive Training for Cancer Related Cognitive Impairment in Breast Cancer Survivors
Recruiting
This Phase III trial will examine the efficacy of computerized cognitive training methods on perceived cognitive impairment in breast cancer survivors.
Gender:
ALL
Ages:
Between 18 years and 100 years
Trial Updated:
05/01/2025
Locations: Rapid City Regional Hospital, Rapid City, South Dakota
Conditions: Breast Cancer, Cognitive Impairments
Pounce™ Thrombectomy System Retrospective Registry
Recruiting
The PROWL registry is an open-label retrospective, multi-center, US study of the Surmodics™ Pounce™ Thrombectomy System for the non-surgical removal of emboli and thrombi in the peripheral arterial vasculature.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
04/29/2025
Locations: North Central Heart, Sioux Falls, South Dakota
Conditions: Peripheral Arterial Disease, Acute Limb Ischemia
A Study to Investigate the Efficacy and Safety of Subcutaneous Lunsekimig (SAR443765) Compared With Placebo in Adult Participants With Moderate-to-severe Atopic Dermatitis
Recruiting
This is a parallel, Phase 2b, randomized, double-blind, placebo-controlled, multicenter study to assess the efficacy, safety, and tolerability of lunsekimig monotherapy in adult participants (aged 18 to 80 years, inclusive) with moderate-to-severe atopic dermatitis (AD). This study explores the efficacy and safety of 3 subcutaneous (SC) dose regimens of lunsekimig in adult participants with moderate-to-severe AD who have a documented history, within 6 months prior to baseline, of an inadequate... Read More
Gender:
ALL
Ages:
Between 18 years and 80 years
Trial Updated:
04/21/2025
Locations: Health Concepts-Site Number: 8400025, Rapid City, South Dakota
Conditions: Dermatitis Atopic
Trial to Evaluate Safety and Efficacy of KPI-012 Ophthalmic Solution in Participants With PCED
Recruiting
The primary objective of the study is to investigate the safety and efficacy of KPI-012 compared to vehicle in participants who have a documented clinical diagnosis of PCED.
Gender:
ALL
Ages:
18 years and above
Trial Updated:
04/18/2025
Locations: Principal Investigator, Rapid City, South Dakota
Conditions: Persistent Corneal Epithelial Defect