Biomedical subjects

Y Onaran

Publications and source records attributed to Y Onaran.

4 recordsLinked to original sources

PubMed1999

The value of DNA content in predicting the prognosis of thyroid carcinoma in an endemic iodine deficiency region.

DNA content of tumour was found to correlate with various prognostic factors and survival, especially in well differentiated thyroid carcinoma. The aim of this investigation was to evaluate the correlation between the DNA ploidy and the prognosis as well as the survival in thyroid carcinoma in our country, being an endemic iodine deficiency region. DNA flowcytometry was performed on paraffin embedded archival tissue blocs of 74 patients with thyroid carcinoma (70 well differentiated, 3 anaplastic and Hurthle cell carcinoma) and 12 patients with multinodular goitre. DNA ploidy was defined as diploidy or aneuploidy. Aneuploidy was detected in 5 (6.8%) patients with thyroid carcinoma (3 anaplastic, 1 papillary and 1 Hurthle cell carcinoma). Aneuploidy was significantly more frequent in patients with anaplastic carcinoma (n: 3/3, 100%) compared to well differentiated thyroid carcinoma (n: 1/70, 1.4%) (p < 0.0001). Aneuploid DNA content significantly correlated with advanced age (p < 0.01), large tumour size (p < 0.001), and low survival (p < 0.01). Mean survival period of patients with anaplastic carcinoma in whom aneuploidy was frequently encountered, was shorter compared to patients with diploid well differentiated tumours (p < 0.01). In conclusion, although anaplastic and follicular carcinoma are more frequently diagnosed in endemic areas, the rate on aneuploidy was found to be lower in thyroid carcinoma in our country compared to data reported to nonendemic areas. As the prognostic predictive value of DNA ploidy is reliable in well differentiated thyroid carcinoma, DNA measurement of FNA biopsy may influence the extent of surgery. Thyroid carcinoma, other than well differentiated types, require radical operations independent of the DNA content. However, adjunctive treatment methods may be used earlier postoperatively according to quantitative DNA measurement.

Adult↗

PubMed1998

Great cervical vein invasion of thyroid carcinoma.

Intraluminal tumor thrombus in great cervical veins as a result of thyroid carcinoma is extremely rare. Three patients (2 Hürthle cell, 1 papillary carcinoma) were surgically treated for thyroid carcinoma associated with tumor thrombus in the great cervical veins. Tumor thrombus in the internal jugular vein due to extension of thyroid carcinoma was found in these 3 patients. Segmental resection of the internal jugular vein was performed in all cases and a tumor thrombectomy from subclavian vein was accomplished in 1 patient. Histological examination verified intraluminal tumor thrombus resulting from invasion of thyroid carcinoma in all patients. The postoperative follow-up period ranged from 1 to 2 years. Of 2 patients undergoing completion thyroidectomy, 1 died of distant metastasis, the other underwent reoperation for local recurrence. The patient who had a definitive primary surgical procedure is free of recurrence. Appropriate initial surgical procedure in rare cases of thyroid carcinoma associated with intraluminal tumor thrombus in great cervical veins seems to improve the clinical outcome of the disease.

Adenocarcinoma↗

PubMed1998

The use of laparoscopy as a primary diagnostic and therapeutic method in penetrating wounds of lower thoracal region.

Diagnostic laparoscopy (DL) was found to be a sensitive and specific method that reduced the incidence of negative or nontherapeutic laparotomy in patients having penetrating abdominal trauma. Twenty-two patients with penetrating trauma of the lower thoracal region were evaluated by DL at the Emergency Department of the Istanbul Medical Faculty to decide on either laparotomy or conservative treatment. There were 7 (31.8%) female and 15 (68.2%) male patients. Mean age was 26.5 (2146) years. Three (13.6%) patients had gunshot wounds and 19 (86.4%) stab injuries. No peritoneal penetration was detected by DL in 11 (50%) patients, and none of these patients later required laparotomy. Of the remaining 11 patients who had peritoneal penetration, diaphragmatic laceration was detected in 9 (81.8%). Nineteen patients (86.4%) avoided nontherapeutic laparotomy. The specificity and sensitivity of DL were 100% in lower thoracal penetrating trauma. The positive diagnostic value and negative predictive value for peritoneal penetration were found to be 100%. The positive predictive value for therapeutic laparotomy and negative predictive value for nontherapeutic laparotomy were 100% as well. All patients who underwent only DL was discharged within 24 hours. There were no mortality or morbidity. Mean follow-up period was 13 months, and no associated complication was encountered during this time.

Abdominal Injuries↗

PubMed1993

Concurrent hyperthyroidism and thyroid carcinoma.

Between 1986 and 1991, thyroidectomy was performed on 138 patients with hyperthyroidism. Thyroid carcinoma was found in eight patients (5.8 per cent). Eighty (58.0 per cent) of the 138 patients had toxic nodular goitre, 33 (23.9 per cent) toxic diffuse goitre and 25 (18.1 per cent) toxic adenoma. Concurrent carcinoma was more frequent in patients with toxic adenoma (8 per cent) than in those with Graves' disease (6 per cent) and toxic nodular goitre (5 per cent). Papillary carcinoma was found in seven patients and follicular carcinoma in one. Three papillary carcinomas were occult with a diameter less than 1.5 cm. Five patients received 100 mCi 131I after operation. There was no morbidity. During follow-up of 10-45 months, there was neither death nor recurrence.

Adenocarcinoma, Follicular↗