Keen F, Williams DM, Essame J, Udiawar M, Nagarajah K, Witczak J, Mitchem K, Kalhan A. Isolated central hypothyroidism: Underlying pathophysiology and relation to antidepressant and antipsychotic medications-A multi-centre South Wales study. Clin Endocrinol (Oxf). 2024 Mar;100(3):245-250. doi: 10.1111/cen.14977. Epub 2023 Sep 25. PMID: 37749919.

John R, Witczak J, Rees A, Hayhurst C, Lansdown A. FRI110 Prevalence Of Thromboembolic Events In 51 Patients Treated For Cushing’s Disease With Pituitary Surgery At University Hospital Of Wales Over A 15-year Period. J Endocr Soc. 2023 Oct 5;7(Suppl 1):bvad114.623. doi: 10.1210/jendso/bvad114.623. PMCID: PMC10553514.

Taylor PN, Lansdown A, Witczak J, Khan R, Rees A, Dayan CM, Okosieme O. Age-related variation in thyroid function - a narrative review highlighting important implications for research and clinical practice. Thyroid Res. 2023 Apr 3;16(1):7. doi: 10.1186/s13044-023-00149-5. Erratum in: Thyroid Res. 2023 May 30;16(1):20. doi: 10.1186/s13044-023-00163-7. PMID: 37009883; PMCID: PMC10069079

Ravindran R, Witczak JK, Bahl S, Premawardhana L, Adlan MA. Myositis, rhabdomyolysis and severe hypercalcaemia in a body builder. Endocrinol Diabetes Metab Case Rep. 2020 Jul 5;2020. Epub 2020 Jul 5. DOI: https:10.1530/EDM-20-0032

Witczak JK, Ubaysekara N, Ravindran R, Rice S, Yousef Z, Premawardhana LD. Significant cardiac disease complicating Graves' disease in previously healthy young adults. Endocrinol Diabetes Metab Case Rep. 2020;2020:19-0132. doi:10.1530/EDM-19-0132

Kamath C, Witczak J, Adlan MA, Premawardhana LD. Managing thymic enlargement in Graves’ disease. Endocrinol Diabetes Metab Case Rep. 2019 Jan 31;2019. pii: EDM180119. doi: 10.1530/EDM-18-0119

Witczak JK, Min T, Prior S, Stephens JW, James PE, Rees DA. Bariatric surgery is accompanied by changes in extracellular vesicle-associated and plasma Fatty Acid Binding Protein 4. Obes Surg. 2017 Aug 19. doi: 10.1007/s11695-017-2879-z

Witczak J, Taylor P, Chai J, Amphlett B, Soukias JM, Das G, Tennant BP, Geen J, Okosieme OE. Predicting malignancy in thyroid nodules: feasibility of a predictive model integrating clinical, biochemical, and ultrasound characteristics. Thyroid Res. 2016 May 25;9:4. doi: 10.1186/s13044-016-0033-y. eCollection 2016.

Witczak JK, Obuobie K. Reply: A unique manifestation of primary adrenal insufficiency or a miss after all? QJM. 2015 Jul 29. pii:hcv139

Witczak JK, Obuobie K. Reply: Reversible cerebral vasoconstriction syndrome might account for the headaches simulating subarachnoid haemorrhage. QJM. 2015 Jul 29. pii: hcv140.

Witczak JK, Williams O, Shekaraiah T, Obuobie K. A near miss: fake tan saved her life! QJM. 2014 Jul 4. pii: hcu144

Witczak JK, Davies R, Okosieme OE. An unusual case of pituitary apoplexy. QJM. 2013 Sep;106(9):861-3. doi: 10.1093/qjmed/hct094. Epub 2013 Apr 25.

Khan I, Witczak JK, Hadjieconomou S, Okosieme OE. Preconception thyroid-stimulating hormone and pregnancy outcomes in women with hypothyroidism. Endocr Pract. 2013 Jul-Aug;19(4):656-62. doi: 10.4158/EP12421.OR

British Endocrine Society Meeting- Diddhenipothage S , Beck K , Amiyangoda C, Bryce B , Cima J , De Groote K , Deyanova Y , Globa E, Herrmann G , Juul A , Kjaer A, Tønnes Pedersen A, Poyrazoglu S , Probst-Scheidegger U , Sas T, Fica S, Seneviratne S, Witczak JK, Orchard E, Tomlinson JW, Ahmed F, Turner HE. Are we giving enough attention to blood pressure control in Turner syndrome? : Data from the international turner syndrome (I-TS) registry. British Endocrine Society Meeting, Glasgow UK

SfE Clinical Update- Yin W, Taylor P, Witczak JK A challenging case of hypogonadism

Welsh Endocrine and Diabetes Society Meeting- Lau J, Witczak JK. Monitoring for The Long-term Metabolic Complications in Patients with Subclinical Cushing’s Syndrome

Welsh Endocrine and Diabetes Society Meeting- Witczak JK, Rees DA, Premawardhana LDKE. Paraganglioma of seminal vesicle

ABCD Autumn Meeting- Witczak JK, Adlan M, Premawardhana LDKE. Mitochondrial diabetes- don't ignore clinical clues (top 4 scoring SpR abstract, 2nd award for oral presentation)

Welsh Endocrine and Diabetes Society Meeting- Witczak JK, Rees DA. Cushing’s syndrome: when should you start hunting for zebras?

Welsh Endocrine and Diabetes Society Meeting- Witczak JK, Adlan M, Premawardhana LDKE. Mitochondrial diabetes- don't ignore clinical clues

Welsh Endocrine and Diabetes Society Meeting- Witczak JK, James P, Rees DA. Cell-derived extracellular vesicles as important intercellular messengers in obesity

Diabetes UK Professional Conference- Witczak JK, Min T, Prior S, Stephens JW, James PE, Rees DA. Changes in adipocyte-derived extracellular vesicles following bariatric surgery- abstract nominated for Young Diabetologist and Endocrinologist Travel Award, Manchester, UK

5th European Young Endocrine Scientists Meeting- Witczak JK, James P, Rees DA. Differences in Circulating Extracellular Vesicles Between Morbidly Overweight Individuals and Healthy Volunteers, Porto, Portugal

Clinical Update, SfE. Witczak JK, Rees DA. Multiple endocrine neoplasia type 1 presenting with acute abdominal pain, Manchester

Diabetes UK Professional Conference- Witczak JK, Mcclatchey M, Evans P, Okosieme OE, Agarwal N. Improving transition from paediatric to adult diabetes services: an audit of changingmodels of care in a district general hospital, Liverpool ACC

Welsh Endocrine and Diabetes Society Meeting-Witczak JK, Page M.Tertiary hyperparathyroidism. A long term complication of pseudohypoparathyroidism type 1b? Newport, Gwent

Welsh Endocrine and Diabetes Society Meeting- Witczak JK, Hadjieconomou S, Okosieme OE. Management of gestational hypothyroidism: are TSH targets realised in practice? Newport, Gwent

Roxas A, Gihawi A, Makarchuk M, Bryce J, Chen M, Ahmed S.F, Ali S.R, Drake A, Groves L, Idkowiak J, Krone R, Flueck C, Nordenström A, Reisch N, Claahsen H, Adriaansen B, Birkebaek N.H, Hannema S, O Reilly M.W, Zaric S.P, Neumann U, Baronio F, Vieites A, Alonso G.F, Elsedfy H, Mazen I, Thankamony A, Witczak J, Rees A, Atapattu N, Seneviratne S.N, Cools M, Guven A, Poyrazoglu S, Fu A, Janus D, Globa E, Shenoy S, de Bruin C, Korbonits M, Adam S, Wasniewska M, Russo G, Phan-Hug F, Bonfig W, Salerno M, Tomlinson J.W, Leka S, de Vries L, Yarhere I, Filho G.G, van Eck J, Bachega T.A.S.S, Krone N, De Bono M, Davies J, Segev-Becker A, Iotova V, Lenherr N, German A, Giordano R, De Sanctis L, Probst U, Markosyan R, Webb E. Glucocorticoid prescribing trends for congenital adrenal hyperplasia over the last 6 years. 9th International Symposium in Disorders/Differences of Sex Development, Stockholm , Sweden

Nagarajah K, Jones E, Witczak JK, Taylor P, Lansdown AJ. Radioiodine therapy outcomes in benign thyroid disease at the University Hospital of Wales, UK. European Congress of Endocrinology, Istanbul, Turkey

Nagarajah K, Lansdown AJ, Witczak JK. A case of Kikuchi-Fujimoto disease with fluctuating thyroid autoantibodies. European Congress of Endocrinology, Istanbul, Turkey

Iqbal F, Yin W, Nijith L, Lansdown A, Taylor P, Witczak J. Cholestyramine as monotherapy for thyrotoxicosis: experience at a tertiary care centre during COVID-19 pandemic. Featured Clinical Case Posters, British Endocrine Society Meeting, Harrogate, UK

Gray H, Witczak J. The screening and management of diabetes mellitus type 2 in patients with acromegaly- a tertiary centre service evaluation. European Congress of Endocrinology, Milan, Italy.

Yau J, Witczak J. Monitoring for the long-term metabolic complications in patients with subclinical Cushing’s syndrome: service evaluation. European Congress of Endocrinology, Milan, Italy.

Iqbal F, Witczak J. Noninsulinoma pancreatogenous hypoglycemia syndrome (NIPHS)- a therapeutic challenge. SfE National Clinical Cases- 2nd place award, London, UK

Giannopolou A, Surya A, Nidumolu R, Witczak J, Kumar N, Rees A. Challenging hypoglycaemia management in a patient with metastatic insulinoma. Endocrine Abstracts (2020) 70 AEP505 | DOI: 10.1530/endoabs.70.AEP505

Nana M, Witczak JK, Ravindran R, Rees DA. Transient Diabetes Insipidus following aortic valve replacement: a case report. BES 2019 Meeting, Brighton, UK

Witczak JK, Ravindran R, Adlan M, Lansdown A, Premawardhana L. Paraganglioma of seminal vesicle. National Clinical Cases, London, UK

Witczak JK, Datta D, James P, Rees DA. : Guided Poster Tour: Cell-derived extracellular vesicles as important intercellular messengers in obesity. European Congress of Endocrinology, Barcelona, Spain

Witczak JK, Ravindran R, Yousef Z, Rice S, Premawardhana LDKE. Significant cardiac disease complicating Graves’ disease in the young. European Congress of Endocrinology, Barcelona, Spain

Ravindran R, Witczak JK, Premawardhana LDKE, Adlan MA. Isolated FSH deficiency. Clinical Cases, London, UK

Ravindran R, Witczak JK, Premawardhana LDKE, Adlan MA. Hypercalcaemia in a body builder. Clinical Cases, London, UK

Witczak JK, Datta D, James P, Rees DA. Effects of a multidisciplinary lifestyle management programme on circulating extracellular vesicles: implications for cardiovascular risk, Diabetes UK Professional Conference, London, UK

Witczak JK, Datta D, James P, Rees DA. Alterations in concentration and characteristics of circulating extracellular vesicles in morbid obesity. British Endocrine Society Meeting, Harrogate, UK

Witczak JK, Min T, Prior S, Stephens J, James P, Rees A. Fatty Acid Binding Protein (FABP4) concentration in plasma is an important early biomarker of metabolic dysfunction, Diabetes UK, Manchester, UK

Witczak JK, Min T, Prior S, Stephens J, James P, Rees A. Extracellular Vesicles (EVs)-associated and plasma FABP4 fluctuations following bariatric surgery, International Society of Extracellular Vesicles Conference , Toronto, Canada

Witczak JK, Burnley-Hall N, Abdul F, Andrschchuk V, Ossei-Gerning N, Anderson R, Rees DA, James P. Extracellular vesicles in erectile dysfunction patients compared to healthy volunteers: Do endothelial extracellular vesicles play an ambivalent role? UKEV, Cardiff

Witczak JK, James P, Rees DA. Gender-related differences in circulating microparticles characteristics- implications for cardiovascular risks? BES Meeting, Edinburgh

Witczak JK, Evans PJ. Does pancreatic enzyme supplementation improve glycaemic control in patients with pancreatic exocrine insufficiency secondary to diabetes? Diabetes UK, London

Witczak JK, Taylor PN, Chai JK, Amphlett B, Soukias J and Okosieme OE. A predictive model for thyroid cancer in patients with thyroid nodules. British Thyroid Association Meeting, London

Witczak JK, Mcclatchey M, Evans P, Okosieme OE, Agarwal N. Improving young diabetic adults metabolic control by changing the transitional care structure. 74th Scientific Sessions, ADA, San Francisco

Witczak JK, Owen PJ, Page M. Tertiary hyperparathyroidism. A long term complication of pseudohypoparathyroidism type 1b? British Endocrine Society Meeting, Liverpool

Witczak JK, Owen PJ. Liraglutide as an effective therapeutic agent in a patient with Prader-Willi Syndrome and type 2 diabetes. British Endocrine Society Meeting, Liverpool

Witczak JK, Mcclatchey M, Mumford B, Oldham V, Okosieme OE, Agarwal N. Improving transition from paediatric to adult diabetes services: an audit of changing models of care in a district general hospital. Diabetes UK Professional Conference, Liverpool

Witczak JK, Owen PJ. An alternative therapy for thyrotoxicosis. Welsh Endocrine and Diabetes Society Meeting, Newport

Witczak JK, Tilsley O. Improvement in survival of newly diagnosed glioblastoma multiforme patients treated with radiotherapy plus concomitant and adjuvant temozolomide at Velindre Cancer Centre. Late Effects in Cancer Survivors Biennial Meeting, Sheffield

Witczak JK, Jones S, Riley S, Fraser D. Study of the potential for an evidence-based quality improvement programme to improve care in patients with diabetes mellitus attending the general nephrology clinic. British Renal Society Meeting, Birmingham