6 results on '"Ravichandran, Nadarajah"'
Search Results
2. A machine learning approach to identify predictive molecular markers for cisplatin chemosensitivity following surgical resection in ovarian cancer
- Author
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Ravichandran Nadarajah, Laura Ling Ying Tan, Qiu Xuan Tan, Jolene Si Min Wong, Melissa Ching Ching Teo, Xing-Yi Sarah Ong, Joey Wee-Shan Tan, Wai Har Ng, Chin-Ann Johnny Ong, Nicholas B. Shannon, Claramae Shulyn Chia, Gillian Ng, Khee Chee Soo, Josephine Hendrikson, Ying Liu, and Grace Hwei Ching Tan
- Subjects
Oncology ,medicine.medical_specialty ,Microarray ,Science ,Genomics ,Article ,Machine Learning ,chemistry.chemical_compound ,Inhibitory Concentration 50 ,Internal medicine ,Cell Line, Tumor ,Biomarkers, Tumor ,Medicine ,Humans ,Stage (cooking) ,Cancer ,Cisplatin ,Ovarian Neoplasms ,Multidisciplinary ,business.industry ,Gene Expression Profiling ,Gene signature ,medicine.disease ,Carboplatin ,Gene Expression Regulation, Neoplastic ,chemistry ,Drug Resistance, Neoplasm ,Female ,business ,Ovarian cancer ,Biomarkers ,medicine.drug - Abstract
Ovarian cancer is associated with poor prognosis. Platinum resistance contributes significantly to the high rate of tumour recurrence. We aimed to identify a set of molecular markers for predicting platinum sensitivity. A signature predicting cisplatin sensitivity was generated using the Genomics of Drug Sensitivity in Cancer and The Cancer Genome Atlas databases. Four potential biomarkers (CYTH3, GALNT3, S100A14, and ERI1) were identified and optimized for immunohistochemistry (IHC). Validation was performed on a cohort of patients (n = 50) treated with surgical resection followed by adjuvant carboplatin. Predictive models were established to predict chemosensitivity. The four biomarkers were also assessed for their ability to prognosticate overall survival in three ovarian cancer microarray expression datasets from The Gene Expression Omnibus. The extreme gradient boosting (XGBoost) algorithm was selected for the final model to validate the accuracy in an independent validation dataset (n = 10). CYTH3 and S100A14, followed by nodal stage, were the features with the greatest importance. The four gene signature had comparable prognostication as clinical information for two-year survival. Assessment of tumour biology by means of gene expression can serve as an adjunct for prediction of chemosensitivity and prognostication. Potentially, the assessment of molecular markers alongside clinical information offers a chance to further optimise therapeutic decision making.
- Published
- 2021
3. Relevance of enlarged cardiophrenic lymph nodes in determining prognosis of patients with advanced ovarian cancer
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Hasan Shahriar Md Nuruzzaman, Ravichandran Nadarajah, Melissa Ching Ching Teo, and Grace Hwei Ching Tan
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Adult ,medicine.medical_specialty ,medicine.medical_treatment ,Diaphragm ,Disease ,Carcinoma, Ovarian Epithelial ,03 medical and health sciences ,0302 clinical medicine ,Peritoneum ,Surgical oncology ,medicine ,Humans ,Neoplasms, Glandular and Epithelial ,Stage (cooking) ,Prospective cohort study ,Peritoneal Neoplasms ,Novel Treatment (New Drug/Intervention ,Established Drug/Procedure in New Situation) ,Neoplasm Staging ,Ovarian Neoplasms ,Chemotherapy ,030219 obstetrics & reproductive medicine ,business.industry ,General Medicine ,Cytoreduction Surgical Procedures ,medicine.disease ,Prognosis ,Neoadjuvant Therapy ,medicine.anatomical_structure ,Cardiophrenic Lymph Node ,030220 oncology & carcinogenesis ,Abdominal Neoplasms ,Lymph Node Excision ,Female ,Radiology ,Lymph Nodes ,business ,Ovarian cancer ,Pericardium - Abstract
Ovarian cancer often presents at an advanced stage with widespread peritoneal and/or extra-abdominal metastases. Complete cytoreduction is the mainstay of treatment for disease confined to peritoneum. But in patients with distant metastases, the role and rationale is less obvious. One of the the most common sites of extra-abdominal disease is the cardiophrenic lymph node (CPLN). In this paper, we described the management of a patient with International Federation of Gynecology and Obstetrics (FIGO) stage IVB epithelial ovarian carcinoma and widespread peritoneal and extra-abdominal metastases to the CPLN, who underwent complete cytoreduction including excision of enlarged CPLN, following neoadjuvant chemotherapy. We examined the literature to determine the prognostic value of enlarged CPLN and their relevance in managing patients with advanced ovarian cancer and found it as an adverse prognostic factor. Transdiaphragmatic excision of CPLN is feasible without major complications. But as its correlation with overall or progression-free survival is not yet evident, large-scale prospective studies are warranted.
- Published
- 2018
4. Novel management of a giant cervical myoma in a premenopausal patient
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Grace Hwei Ching Tan, Melissa Ching Ching Teo, Jolene Wong, and Ravichandran Nadarajah
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Infertility ,Adult ,medicine.medical_specialty ,medicine.medical_treatment ,Trachelectomy ,Uterine Cervical Neoplasms ,03 medical and health sciences ,0302 clinical medicine ,Obstetrics and gynaecology ,Uterine Myomectomy ,medicine ,Humans ,Novel Treatment (New Drug/Intervention ,Established Drug/Procedure in New Situation) ,Gynecology ,Cervical cancer ,030219 obstetrics & reproductive medicine ,Uterine leiomyoma ,Leiomyoma ,business.industry ,Pelvic pain ,Fertility Preservation ,Myoma ,General Medicine ,medicine.disease ,Premenopause ,030220 oncology & carcinogenesis ,Endometrial ablation ,Female ,medicine.symptom ,business - Abstract
Cervical myomas are rare and account for
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- 2017
5. A randomised controlled trial of expectant management versus surgical evacuation of early pregnancy loss
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Shu Yuan Woon, Kaliammah Kuppannan, Ravichandran Nadarajah, Yek Song Quek, and Ravichandran Jeganathan
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Adult ,medicine.medical_specialty ,Early Pregnancy Loss ,medicine.medical_treatment ,Dilatation and Curettage ,Miscarriage ,law.invention ,Randomized controlled trial ,Pregnancy ,law ,medicine ,Humans ,Watchful Waiting ,Expectant management ,Ultrasonography ,Obstetrics ,business.industry ,Obstetrics and Gynecology ,medicine.disease ,Abortion, Incomplete ,Curettage ,Abortion, Spontaneous ,Pregnancy Trimester, First ,Treatment Outcome ,Reproductive Medicine ,Products of conception ,Gestation ,Female ,business ,Complication - Abstract
Objective To show whether a clinically significant difference in success rates exists between expectant and surgical management of early pregnancy loss. Study design Randomised controlled trial comparing expectant versus surgical management of early pregnancy loss over a 1-year period from 1st January to 31st December 2009 at Sultanah Aminah Hospital, Johor Bahru. Pregnant women with missed or incomplete miscarriages at gestations up to 14 weeks were recruited in this study. The success rate in the surgical group was measured as curettage performed without any complications during or after the procedure, while the success rate in the expectant group was defined as complete spontaneous expulsion of products of conception within 6 weeks without any complication. Results A total of 360 women were recruited and randomised to expectant or surgical management, with 180 women in each group. There was no statistically significant difference in the success rate between the groups and between the different types of miscarriage. With expectant management, 131 (74%) patients had a complete spontaneous expulsion of products of conception, of whom 106 (83%) women miscarried within 7 days. However, the rates of unplanned admissions (18.1%) and unplanned surgical evacuations (17.5%) in the expectant group were significantly higher than the rates (7.4% and 8% respectively) in the surgical group. The complications in both groups were similar.
- Published
- 2014
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6. Live birth rates and safety profile using dydrogesterone for luteal phase support in assisted reproductive techniques
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Ravichandran Nadarajah, Fazlin Faisal, Ker Yi Wong, Su Ling Yu, and Hemashree Rajesh
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Adult ,medicine.medical_specialty ,Reproductive Techniques, Assisted ,medicine.medical_treatment ,Fertilization in Vitro ,Luteal phase ,Dydrogesterone ,Luteal Phase ,Intracytoplasmic sperm injection ,Miscarriage ,03 medical and health sciences ,Young Adult ,0302 clinical medicine ,medicine ,Humans ,030212 general & internal medicine ,Birth Rate ,Retrospective Studies ,Pregnancy ,Fetus ,030219 obstetrics & reproductive medicine ,In vitro fertilisation ,business.industry ,Obstetrics ,General Medicine ,Middle Aged ,medicine.disease ,Treatment Outcome ,Female ,Original Article ,Progestins ,business ,Live birth ,medicine.drug - Abstract
Introduction Assisted reproductive techniques (ARTs) result in a deficient luteal phase, requiring the administration of intramuscular, intravaginal or oral exogenous progesterone. Dydrogesterone, an oral retroprogesterone with good bioavailability, has been used in assisted reproductive cycles with outcomes that are comparable to those of vaginal or intramuscular progesterone. However, there are limited reviews on its use for luteal phase support in ARTs, in terms of pregnancy outcomes and associated fetal anomalies. This study aimed to review the live birth rates and associated fetal anomalies of women who were given dydrogesterone for luteal phase support in assisted reproductive cycles at a tertiary hospital in Singapore. Methods This retrospective descriptive study included 1,050 women who underwent in vitro fertilisation/intracytoplasmic sperm injection at the Centre for Assisted Reproduction of Singapore General Hospital between 2000 and 2011. The women were given dydrogesterone for luteal phase support. The main outcome measures were rates of pregnancy, live birth, miscarriage and fetal anomalies. Results The pregnancy and live birth rates were 34.7% and 27.7%, respectively. Among those who achieved pregnancy, 17.0% miscarried, 0.8% had ectopic pregnancies and 0.3% had molar pregnancies. Fetal anomalies were detected in 1.9% of pregnancies, all of which were terminated by choice. Conclusion Since the outcomes of dydrogesterone are comparable to those of intramuscular and vaginal progesterone, it is a reasonable option to provide luteal phase support for women who are uncomfortable with injections or vaginal insertions. Randomised controlled studies are needed to determine the optimal dosage of dydrogesterone for luteal phase support in ARTs.
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- 2016
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