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Biomedical subjects

A Ayhan

Publications and source records attributed to A Ayhan.

At least 127 records · Page 7Linked to original sources
PubMed1993

Risk factors for groin node metastasis in squamous carcinoma of the vulva: a multivariate analysis of 39 cases.

This study includes 39 patients with squamous carcinoma of the vulva subjected to radical surgery. Stage, tumor description, cell type, lesion localization, lesion size, depth of invasion, grade, lymphovascular space invasion, number of mitoses, degree of stromal inflammatory reaction, and tumors in surgical margins were analyzed for groin metastasis. Of the factors analyzed, stage (P = 0.018), grade (P = 0.007) and depth of invasion (P = 0.001) were found to be the most important predictors of node metastasis. While a combination of factors permitted to define a low-risk group with 0% node metastasis, it seems hard to identify preoperatively those patients with no risk of nodal metastasis.

Adult↗
PubMed1993

Expression of amphiregulin, a novel gene of the epidermal growth factor family, in human gastric carcinomas.

The expression of mRNA for amphiregulin (AR), a novel gene of the epidermal growth factor family, was examined in 8 human gastric carcinoma cell lines and 32 gastric carcinoma tissues as well as corresponding normal mucosa. Of the 8 gastric carcinoma cell lines, 7 expressed 1.4 kb AR mRNA at various levels. The expression of AR mRNA by TMK-1 and MKN-28 cells was increased by treatment with epidermal growth factor or transforming growth factor a. In surgical cases, all the gastric carcinoma tissues and their adjacent normal mucosa expressed AR mRNA. Interestingly, 20 (62.5%) out of 32 tumors expressed AR mRNA at higher levels than their corresponding normal mucosas (tumor/normal > or = 1.2). No obvious correlation was observed between the AR mRNA levels and the histological types or tumor staging of gastric carcinoma. Immunohistochemically, AR protein was localized to the cytoplasm and/or nucleus in tumor cells. These results suggest that AR produced by tumor cells may be involved in the pathogenesis and/or progression of human gastric carcinoma.

Adult↗
PubMed1993

Activated protein C levels in patients with gynecologic tumors.

Activated protein C (APC) levels were measured in the plasma of patients with benign and malignant gynecologic tumors preoperatively, and on postoperative days 1 and 7. Preoperative levels of APC were found to be significantly low in both groups of patients compared to a group of healthy subjects. On postoperative day 1, levels of APC decreased significantly in both groups of patients compared to preoperative levels. By the 7th postoperative day, levels of APC in patients with benign tumors had increased significantly compared to postoperative day 1; levels in patients with malignant tumors, however, remained low. Our findings imply that there is a substantive correlation between gynecologic tumors, gynecologic surgery and the coagulation inhibitor, APC, which, in turn, can presumably be used to identify gynecologic patients who are at high risk for venous thrombosis.

Adult↗
PubMed1993

Primary carcinoid tumor of the ovary. A case report.

The clinicopathologic features of a patient with primary carcinoid tumor of the ovary who presented with the signs of cardiac failure are described. The patient underwent total abdominal hysterectomy + bilateral salpingo-oophorectomy + omentectomy + bilateral pelvic lymphadenectomy + appendectomy; and she is alive with no evidence of recurrent disease one year after surgery.

Appendectomy↗
PubMed1993

Immature teratoma of the ovary.

The clinicopathologic experience of 10 patients with immature ovarian teratoma is presented. The mean age of the patients was 22.1. Abdominopelvic mass was the presenting symptom in the majority of cases. Immature ovarian teratomas accounted for 4.0% of germ cell tumors and 2.1% of all ovarian neoplasms diagnosed in our institution. Of the patients, 6 had Stage I disease and 7 had grade I tumor. Unilateral tumor was encountered in the majority of patients. Adequate primary surgical-pathologic staging and multiagent chemotherapy seem to be the treatment of choice.

Adolescent↗
PubMed1992

Synchronous primary malignancies of the female genital tract.

This study includes 29 patients with synchronous primary malignancies of the female genital tract. These patients constituted 1.7% of all genital malignancies. The most frequently observed synchronous neoplasms were those of the ovary together with the endometrium (51.7%). Most patients had early-stage and low-grade disease. Stage I disease was observed in 68.1% of patients with ovarian cancer. Patients with synchronous ovarian and endometrial cancer had a 73.3% 5-year survival rate, suggesting a favorable prognosis.

Adult↗
PubMed1992

Complications of radical vulvectomy and inguinal lymphadenectomy for the treatment of carcinoma of the vulva.

Forty-two patients with invasive carcinoma of the vulva, subjected to radical vulvectomy and inguinal lymphadenectomy, were evaluated retrospectively. The mean age of patients was 61.6 years. Fifteen patients (35.7%) had complicating medical diseases, the histopathological diagnoses were squamous carcinoma (n = 39), undifferentiated carcinoma (n = 1), and malignant melanoma (n = 2). The postoperative morbidity and mortality rates were found to be 73.8% and 11.6%, respectively.

Adult↗
PubMed1992

p53 point mutations in primary human gastric carcinomas.

p53 point mutations in primary gastric carcinomas were analyzed by performing cDNA deoxynucleotide sequencing of the gene. Out of 16, 9 (56.3%) primary gastric carcinoma cases, including early cancer, showed one or more p53 point mutations in their open-reading frame, and 4 out of 9 cases had a p53 point mutation within highly conserved domains. The characteristics of the p53 mutation spectrum observed in primary tumors were (a) frequent mutation at an A:T pair (50%, 7 out of 14 mutations), (b) high transversion incidence (29%, 4 out of 14 mutations), (c) no transition at CpG, and (d) no G:C to T:A transversion. Our results suggest that p53 mutation is a common event in gastric carcinoma occurring from the early stage of progression with its specific mutation spectrum.

Adult↗
PubMed1992

Expression of transforming growth factor alpha in human tissues: immunohistochemical study and northern blot analysis.

The expression of transforming growth factor alpha (TGF-alpha) was examined in various human tissues and the fetus, using immunohistochemistry and Northern blot analysis. TGF-alpha immunoreactivity was detected mainly in the epithelial cells of the digestive tract, liver, pancreas, kidney, thyroid, adrenal, skin, mammary gland and genital organs. In the digestive tract, epithelial cells with regenerative change or hyperplastic change showed strong immunoreactivity to TGF-alpha. Peripheral nerve, vessels, megakaryocytes and macrophages in the lung and spleen were also positive for TGF-alpha. By Northern blot analysis the expression of TGF-alpha mRNA was confirmed in the digestive tract, salivary gland, thyroid, kidney and mammary gland. In the human fetus, the nerve tissues, liver, adrenal and kidney were positive for TGF-alpha. Strong immunoreactivity to TGF-alpha was observed in the hepatocytes of the fetus. These findings indicate that TGF-alpha is produced by a variety of non-neoplastic cells in both adult and fetal tissues.

Adrenal Glands↗
PubMed1992

Reproductive performance after conventional metroplasty: an evaluation of 102 cases.

OBJECTIVE: To evaluate the influence of conventional metroplasty on reproductive performance of symmetric uterine anomalies and determine the complications of these procedures. DESIGN: A retrospective clinical analysis of consequently operated 102 women. SETTING: Institutional. PATIENTS AND PARTICIPANTS: One hundred two patients with bicornuate and septate uterus and a history of late recurrent abortion and/or preterm delivery were included in this study. INTERVENTIONS: Jones, Strassman, and Tompkins procedures for metroplasty and McDonald operation for cervical cerclage. MAIN OUTCOME MEASURE: The fetal survival rate has increased from 3.7% before operation to 75.0% afterwards. In only two patients uterine rupture was observed. RESULTS: Conventional metroplasty improves the fetal survival rate in women with symmetric uterine anomalies. CONCLUSIONS: Our results confirm the view that conventional metroplasty seems to be an operation of choice in women with symmetric uterine anomalies and a history of recurrent late abortion and preterm delivery. However, uterine rupture and postoperative infertility may be potential complications.

Adult↗
PubMed1992

Tyrosine kinase activity of epidermal growth factor receptor in human gastric carcinomas.

We examined tyrosine kinase activity of epidermal growth factor (EGF) receptor in a total of 34 human gastric carcinomas as well as in non-neoplastic gastric mucosa from the same patients. EGF receptor kinase activity of the carcinoma tissues and the non-neoplastic mucosa were 1.28 +/- 1.00 (Mean +/- S.E.) and 0.16 +/- 0.04 respectively, if the EGF receptor kinase activity of human placenta is 10. Twenty-one (62%) carcinoma tissues showed higher EGF receptor kinase activity than corresponding non-neoplastic mucosa, while in 6 cases (18%) the kinase activity was higher in the non-neoplastic mucosa than in the tumor tissues. No obvious correlation was observed between the increased kinase activity in the tumors and histological type or tumor staging. One tumor showed extremely high receptor kinase activity with ERBB gene amplification. This tumor showed strong immunoreactivity to EGF itself.

ErbB Receptors↗
PubMed1992

Remission rates and significance of prognostic factors in gestational trophoblastic tumors.

The clinical courses of 82 women with gestational trophoblastic tumors were evaluated in accordance with International Federation of Gynecologists and Obstetricians staging, traditional criteria and the modified World Health Organization prognostic scoring system. The overall remission rate was 79.3% (65/82), and the mortality rate was 20.7% (17/82). All the patients with nonmetastatic stage I disease and all with prognostic scores less than or equal to 4 attained remission, whereas patients at high risk and with stage IV disease had the lowest remission and survival rates. The results support the validity of each system. However, the World Health Organization scoring system, a combination of traditional criteria and International Federation of Gynecologists and Obstetricians staging seemed to be the most reliable for predicting treatment failures.

Adolescent↗
PubMed1992

A non-antibiotic antimicrobial mixture (C31G): evaluation of the antimicrobial efficiency of C31G on vaginal cultures.

Minimum inhibitory concentrations and the effective period for cidal concentrations of an amphoteric surfactant mixture (C31G) were determined on 13 microorganisms (common bacteria, strains ATCC, and fungi) by microtiter dilution procedure. Also the antimicrobial efficiency of this composition (C31G) was evaluated on 105 culture samples which were obtained from (Turkish) patients having vaginal infections. E. coli was found to be the most frequently observed microorganism (45.45%) in these samples and C31G was determined to be active on microorganisms obtained from vagina at low concentrations in a short time.

Anti-Bacterial Agents↗
PubMed1992

Management of invasive cervical cancer in patients initially treated by simple hysterectomy.

This study includes 15 patients with invasive cervical cancer found at the time of standard hysterectomy for benign conditions. All patients underwent laparotomy and were subjected to peritoneal cytology, radical parametriectomy, bilateral pelvic and para-aortic lymphadenectomy. Residual disease was found in 10 of the 15 patients (66.7%). The 3-year survival of patients with and without residual disease were 80% and 100%, respectively. Following secondary radical surgery, five patients without evidence of residual disease were identified and spared the risks of radiation therapy. Furthermore, two patients with para-aortic lymph node metastases, who would otherwise have been overlooked, were thus treated completely. One patient died of complications of secondary surgical procedure.

Adult↗
PubMed1992

Prognostic value of mitotic activity, eosinophilic and inflammatory reaction in stage I cancer of the uterine cervix.

This study includes 110 patients treated surgically for stage I squamous cell carcinoma of the cervix. The prognostic significances of mitotic activity, stromal inflammatory and eosinophilic reactions were studied. The 5-year survival rate varied from 75.0% to 93.3% and pelvic lymph node metastases (PLNM) varied from 23.0% to 31.2% according to degree of these variables. None of these pathological parameters was found to be a significant predictor of pelvic lymph node metastases and 5-year survival.

Adult↗
PubMed1991

Endometrial carcinoma: a pathologic evaluation of 142 cases with and without associated endometrial hyperplasia.

The association of some cases of endometrial carcinoma (EC) with hyperestrogenism is well known. The prognostic significance of concomitant endometrial hyperplasia (EH) in EC were evaluated in 142 patients with clinical stage I EC in whom lymph node assessment was carried out in 121 patients. The presence of EH was significantly associated with better differentiated tumor having lesser degrees of myometrial invasion, low segment-adnexal-lymphovascular space and pelvic/para-aortic lymph node involvement. However, the presence of EH was not significantly associated with the less virulent histologic subtypes. The possible existence of two types of EC--a hormonal-dependent EC associated with EH, and an independent EC not associated with EH--is discussed and the prognostic significance of concomitant EH stressed.

Adenocarcinoma↗
PubMed1991

Prognosticators of second-look laparotomy findings in patients with epithelial ovarian cancer.

Prognosticators of outcome at second-look laparotomy (SLL) were evaluated in 49 patients with epithelial ovarian carcinoma undergoing SLL. Residual tumor volume was found to be the most significant prognosticator of outcome, with initial tumor stage being of secondary importance. Grade of tumor played no role in outcome at SLL. The results of the study led us to the conclusion that the second-look procedure may be safely omitted in stage I patients. The importance of optimal cytoreduction during primary surgery was stressed.

Carcinoma↗