Item analysis: the impact of distractor efficiency on the difficulty index and discrimination power of multiple-choice items.

BACKGROUND: Distractor efficiency (DE) of multiple-choice questions (MCQs) responses is a component of the psychometric analysis used by the examiners to evaluate the distractors' credibility and functionality. This study was conducted to evaluate the impact of the DE on the difficulty and discrimination indices. METHODS: This cross-sectional study was conducted from April to June 2023. It utilizes the final exam of the Principles of Diseases Course with 45 s-year students. The exam consisted of 60 type A MCQs. Item analysis (IA) was generated to evaluate KR20, difficulty index (DIF), discrimination index (DIS), and distractor efficiency (DE). DIF was calculated as the percentage of examinees who scored the item correctly. DIS is an item's ability to discriminate between higher and lower 27% of examinees. For DE, any distractor selected by less than 5% is considered nonfunctional, and items were classified according to the non-functional distractors. The correlation and significance of variance between DIF, DI, and DE were evaluated. RESULTS: The total number of examinees was 45. The KR-20 of the exam was 0.91. The mean (M), and standard deviation (SD) of the DIF of the exam was 37.5(19.1), and the majority (69.5%) were of acceptable difficulty. The M (SD) of the DIS was 0.46 (0.22), which is excellent. Most items were excellent in discrimination (69.5%), only two were not discriminating (13.6%), and the rest were of acceptable power (16.9%). Items with excellent and good efficiency represent 37.3% each, while only 3.4% were of poor efficiency. The correlation between DE and DIF (p = 0.000, r= -0.548) indicates that items with efficient distractors (low number of NFD) are associated with those having a low difficulty index (difficult items) and vice versa. The correlation between DE and DIS is significantly negative (P = 0.0476, r=-0.259). In such a correlation, items with efficient distractors are associated with low-discriminating items. CONCLUSIONS: There is a significant moderate negative correlation between DE and DIF (P = 0.00, r = -0.548) and a significant weak negative correlation between DE and DIS (P = 0.0476, r = -0.259). DIF has a non-significant negative correlation with DIS (P = 0.7124, r = -0.0492). DE impacts both DIF and DIS. Items with efficient distractors (low number of NFD) are associated with those having a low difficulty index (difficult items) and discriminating items. Improving the quality of DE will decrease the number of NFDs and result in items with acceptable levels of difficulty index and discrimination power.

Primary hyperparathyroidism associated with colorectal cancer: case report.

The association between colorectal cancer and primary hyperparathyroidism has been reported as case reports in the literature. There are few data regarding the molecular explanation of such coexistence. Here we report a case with synchronous pathologies of primary hyperparathyroidism and colorectal cancer. Furthermore, the patient has a positive family history of the same two pathologies in one of his first-degree relatives. We reviewed the literature to clarify and explain the relationship between these two diseases. We aimed to shed light on the coexistence of such conditions and to clarify if there is a relation between them or if it is just a coincidence.

Ganetespib (STA-9090) augments sorafenib efficacy via necroptosis induction in hepatocellular carcinoma: Implications from preclinical data for a novel therapeutic approach.

Sorafenib, a multikinase inhibitor, is a first-line treatment for advanced hepatocellular carcinoma, but its long-term effectiveness is limited by the emergence of resistance mechanisms. One such mechanism is the reduction of microvessel density and intratumoral hypoxia caused by prolonged sorafenib treatment. Our research has demonstrated that HSP90 plays a critical role in conferring resistance to sorafenib in HepG2 cells under hypoxic conditions and N-Nitrosodiethylamine-exposed mice as well. This occurs through the inhibition of necroptosis on the one hand and the stabilization of HIF-1α on the other hand. To augment the effects of sorafenib, we investigated the use of ganetespib, an HSP90 inhibitor. We found that ganetespib activated necroptosis and destabilized HIF-1α under hypoxia, thus enhancing the effectiveness of sorafenib. Additionally, we discovered that LAMP2 aids in the degradation of MLKL, which is the mediator of necroptosis, through the chaperone-mediated autophagy pathway. Interestingly, we observed a significant negative correlation between LAMP2 and MLKL. These effects resulted in a reduction in the number of surface nodules and liver index, indicating a regression in tumor production rates in mice with HCC. Furthermore, AFP levels decreased. Combining ganetespib with sorafenib showed a synergistic cytotoxic effect and resulted in the accumulation of p62 and inhibition of macroautophagy. These findings suggest that the combined therapy of ganetespib and sorafenib may offer a promising approach for the treatment of hepatocellular carcinoma by activating necroptosis, inhibiting macroautophagy, and exhibiting a potential antiangiogenic effect. Overall, continued research is critical to establish the full therapeutic potential of this combination therapy.

Rare Cystic Hygroma of the Axilla and Breast in Adults, Case Report, Long-Term Follow-Up and Literature Review: An Experience from Saudi Arabia.

Introduction: Cystic hygroma (CH) in adults is a rare condition. Most CH cases are diagnosed at birth or during the first two years of life. Head and neck are the most common sites. There is scanty information about the natural history and follow-up of adult patients with axillary and breast CH. Hence, we present this case to shed some light on the natural history, complications, and a new suggested modality of treatment to deal with the complications. Case Presentation: We report a case of a 39-year-old female who presented after ten years of excision of the right axillary CH with massive breast edema and recurrence of cysts in the ipsilateral breast and axilla. The insertion treated the edema of a breast-peritoneal shunt. Discussion: The procedure was performed by inserting a normal V-P shunt catheter without a reservoir through a small incision in the inframammary fold toward the breast and another tiny incision at 10 of the clock in the right breast for fixation in the breast parenchyma. A catheter was inserted through a small incision on the right lumbar spine without intraperitoneal fixation after the catheter was inserted subcutaneously. Conclusion: This case report shows that adult CH can reoccur. To our knowledge, this is the second case of CH concomitantly involving the breast and axilla. The shunt of the edematous fluid to the peritoneal cavity can give hope for intractable breast edema treatment.

Assessment of the Quality of Multiple-Choice Questions in the Surgery Course for an Integrated Curriculum, University of Bisha College of Medicine, Saudi Arabia.

INTRODUCTION: Multiple-choice questions (MCQs) have been recognized as reliable assessment tools, and incorporating clinical scenarios in MCQ stems has enhanced their effectiveness in evaluating knowledge and understanding. Item analysis is used to assess the reliability and consistency of MCQs, indicating their suitability as an assessment tool. This study aims to ensure the competence of graduates in serving the community and establish an examination bank for the surgery course. OBJECTIVE: This study aims to assess the quality and acceptability of MCQs in the surgery course at the University of Bisha College of Medicine (UBCOM). METHODS: A psychometric study evaluated the quality of MCQs used in surgery examinations from 2019 to 2023 at UBCOM in Saudi Arabia. The MCQs/items were analyzed and categorized for their difficulty index (DIF), discrimination index (DI), and distracter efficiency (DE) Fifth-year MBBS students undergo a rotation in the department and are assessed at the end of 12 weeks. The assessment includes 60 MCQs/items and written items. Data was collected and analyzed using SPSS version 24. RESULTS: A total of 189 students were examined across five test sessions, with 300 MCQ items. Student scores ranged from 28.33% to 90.0%, with an average score of 64.6%±4.35. The 300 MCQ items had a total of 900 distractors. The DIF was 75.3% for the items, and 63.3% of the items showed good discrimination. No items had negative points in terms of biserial correlation. The mean number of functional distractors per test item was 2.19±1.007, with 34% of the items having three functional distractors. CONCLUSION: The psychometric indices used to evaluate the MCQs in this study were encouraging, with acceptable DIF, distractor efficiencies, and item reliability. Providing robust faculty training and capacity-building is recommended to enhance item development skills.

An Unusual Solitary Fibrous Tumor of the Ischiorectal Region.

Solitary fibrous tumors (SFTs) are rare fibroblastic/myofibroblastic proliferations that occur in a wide range of anatomical sites. These tumors have nonspecific clinical presentations often with unpredictable biological behavior. SFTs can be slow growing low-risk tumors or rapidly growing high-risk tumors. They show a wide variety of histological features and typically are characterized by NAB2-STAT6 fusion. SFTs of the ischiorectal fossa are rare, with few studies reported in the literature to date. Here, we report a 90-year-old male who had a road traffic accident in October 2018. A pelvic computed tomography (CT) revealed a mass measuring 3.5 × 2.5 cm in the right ischiorectal fossa. Histopathology of the CT-guided biopsies confirmed the diagnosis of low-grade SFT. No surgical intervention was needed since the patient was asymptomatic. In January 2022, a follow-up CT showed a gradual increase in tumor size (5 × 3.5 × 3 cm), but not infiltrating the surrounding structures. However, the patient complained of constipation, which warranted a surgical excision of the mass. Subsequently, immunohistological examination reconfirmed the diagnosis of low-risk SFT. Here, we discussed the clinicopathological features of the case and the relevant literature about pelvic SFTs. In conclusion, SFTs should be considered in the differential diagnosis of any ischiorectal mass. It is recommended that tissue samples be obtained, and immunohistology should be performed.