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Biomedical subjects

S Ozuysal

Publications and source records attributed to S Ozuysal.

6 recordsLinked to original sources
PubMed2006

Nm23 expression in node-positive and node-negative endometrial cancer.

OBJECTIVE: To examine the relationships between the expression of protein Nm23 and surgical stage, histologic grade, histopathologic findings, and survival in women with endometrial carcinoma. METHODS: 19 patients with lymph node involvement were matched with 24 patients without lymph node involvement and the best paraffin-embedded blocks were selected for Nm23 immunohistochemical staining. The slides were evaluated semiquantitatively according to their degree of cytoplasmic staining. Statistical analysis was performed to determine whether there was a relationship between Nm23 expression and surgical stage, histologic grade, depth of myometrial invasion, lymph node metastasis, and/or lymphovascular space involvement. Survival analysis was also performed. RESULTS: Slides from 15 patients (79%) with lymph node involvement and 22 patients (88%) without lymph node involvement were found to be positive for Nm23 (P=0.01). No significant relations were observed between Nm23 expression and surgical stage, histologic grade, depth of myometrial invasion, or lymphovascular space involvement. Nm23 expression was found to be significantly related to lower rates of lymph node metastasis and longer survival (P=0.02). CONCLUSION: Elevated Nm23 expression is related to lower rates of lymph node metastasis and longer survival.

Biomarkers, Tumor↗
PubMed2001

Effects of Taxol plus radiation on the apoptotic and mitotic indices of mouse intestinal crypt cells.

PURPOSE: In this study we investigated the effect of Taxol, radiation, or Taxol plus radiation on highly proliferative normal tissue--the intestinal crypt cells of Swiss albino mice. MATERIALS AND METHODS: Swiss-albino mice, 3-4 months old, were used in this study. Taxol was administered by bolus intravenously through the tail vein. Radiation was given using a linear accelerator. There were four treatment categories, which comprised a total of 34 groups. Each group consisted of five animals. The first category was a control category which comprised one group (n = 5). The second treatment category was Taxol alone which comprised three groups (n = 15). The third treatment category was radiation alone which comprised three groups (n = 15). The fourth treatment category was Taxol plus radiation which comprised 27 groups (n = 135). Mice were killed 24 h after Taxol or radiation or combined administration using ether anesthesia. Using a light microscope, apoptotic and mitotic indices were counted on jejunal crypt cells of mice that were stained with hematoxylin-eosin. Differences between groups were statistically evaluated with Student's t-test. RESULTS: Taxol caused a dose-dependent increase in apoptosis (P = 0.045) and decreased the mitotic index (P = 0.006) at high doses. Similarly, radiation caused a dose-dependent increase in apoptosis (P = 0.046) and decreased the mitotic index (P = 0.299) at higher radiation doses. Compared to radiation alone, Taxol caused a significant induction of apoptosis (P = 0.010). In combination, no significant radiosensitizing effect of Taxol was observed (enhancement ratio < 1), when compared to radiation alone. However, an increase in apoptosis was observed after 24 h of Taxol exposure when compared to 12 or 48 h of Taxol exposure (P = 0.0001 and P = 0.0001). CONCLUSION: These findings suggest that Taxol did not cause a radiosensitizing effect in intestinal crypt cells. However, a 24-hour pretreatment of Taxol exposure followed by radiation caused significant induction of apoptosis and reduction of the mitotic index when compared to other Taxol timing sequences. Thus, the lack of a radiosensitizing effect of Taxol in these proliferative cells may be due to enhanced mitotic death rather than apoptotic death.

Animals↗
PubMedDate not supplied

Primary psammocarcinoma of the peritoneum.

Psammocarcinoma is a rare type of serous carcinoma arising from the ovaries or the peritoneum. Histopathologically, it has large deposits of psammoma bodies, invasion to surrounding tissues, and low-grade cytologic atypia. Biologic behavior is similar to borderline serous tumors with a favorable survival time. Primary surgical debulking with complete resection of the tumor should be the main surgical approach, while the benefit of postoperative chemotherapy remains unknown. A new case of primary peritoneal psammocarcinoma with survival after an initial diagnosis of 5.5 years is presented with a literature review.

Adenocarcinoma↗
PubMedDate not supplied

Chloroquine in idiopathic pulmonary hemosiderosis. A case report.

This report describes an 11-year-old boy with idiopathic pulmonary hemosiderosis. His only presenting symptom was severe anemia due to iron deficiency. Idiopathic pulmonary hemosiderosis was diagnosed nine years after the onset of symptoms. During this period many invasive and non-contributory investigations were performed. This report describes the patient's diagnostic problems, clinical features and dramatic improvement with chloroquine (250 mg/day) after failing to respond to megadose methylprednisolone (30 mg/kg). One year later, chloroquine was discontinued. The patient has remained in remission since March 1994. Chloroquine should be used for this life-threatening condition since it is less toxic than other immunosuppressive drugs.

Anemia, Iron-Deficiency↗