Effect of cryopreservation on in vitro seed germination and protocorm growth of Mediterranean orchids.

BACKGROUND: Cryopreservation is an effective method for the long-term conservation of plant germplasm. OBJECTIVE: In the present study the effect of liquid nitrogen on seed structure, germination and protocorm development of eight Mediterranean orchid species was evaluated. MATERIALS AND METHODS: A scanning electron microscopy analysis was conducted to investigate the effect of the immersion in liquid nitrogen on seed integuments. Germination and protocorms growth were obtained applying in vitro cultures techniques. RESULTS: No micro-morphological differences emerged between cryopreserved and untreated seeds. The effect of the treatment on the seed germination varied on the basis of the species. For Ophrys sphegodes ssp. passionis and Orchis mascula, freezing resulted in a significant increase of germination percentages. Protocorms of all species showed a positive growth trend although some significant differences of size occurred among the protocorms derived from treated and untreated seeds. CONCLUSION: Cryogenic techniques seem to have great potential in orchid germplasm conservation.

Primary carcinoma of the fallopian tube.

BACKGROUND: Because of the rarity of fallopian tube cancer, clinical approaches have changed during the last 18 years. METHODS: Twenty-nine patients with fallopian tube cancer were treated at the Gynecologic Oncology Department of Milan University from 1970 to 1988. The mean patient age was 59 years. Parity, symptomatology and histology were considered. Distribution by stage was as follows: I, 11 (37%); II, 10 (34%); III, 8 (27%) according to the Dodson classification. Twenty patients (69%) underwent surgery followed by pelvic irradiation. Adjuvant chemotherapy was performed in the treatment of 5 women with stage I disease, 6 with stage II, and all 8 with stage III. RESULTS: Five-year overall survival was 41.38%: 47.6% at stages I and II, 25% at stage III. Radiotherapy has not been replaced by cisplatin-based multiagent chemotherapy. Optimal surgical debulking combined with accurate lymph node sampling are not followed by systematic use of repeat laparotomy. CONCLUSIONS: The procedures described in this work improve the clinical assessment and patient survival, and make different series comparable.

[Prognosis factors in epithelial tumors of the ovary]. / Fattori di prognosi nei tumori epiteliali dell'ovaio.

87 patients treated for epithelial ovarian carcinoma between 1975 and 1986 were evaluated intensively. In all cases the original operation was followed by surgical reassessment to evaluate the result of adjuvant therapy and to study the cases without apparent disease. The actuarial survival rate after 3 years, by Kaplan-Meier calculation, demonstrated 73.5% survival in patients with negative second-look versus 32% in presence of positive reassessment (P less than 0.01). Surgical reexploration and histologic study were negative in 34 cases (39%). Original stage, histotype, histological grading, peritoneal washing and age of patients were considered for prognostic evaluation of the tumor. The absence of residual tumor (RT) at first surgery resulted in complete response after adjuvant therapy in 70.8% of women, versus 25.8% with RT greater than 2 cm (P less than 0.01). Negative second-look appears the most important prognostic factor for the evaluation of epithelial ovarian cancer (P less than 0.001).

Breast carcinoma and plasma 17-beta-estradiol binding.

The data relating to plasma steroid binding and transport (usually measured with dehydrotestosterone) are controversial. The plasma E2 binding of 79 breast carcinoma patients, 19 premenopausal and 60 postmenopausal, were compared to 46 controls, 21 premenopausal and 25 postmenopausal. In this study the authors removed the endogenous steroids with charcoal, incubated the plasma with 17-beta-E2 in non-saturation conditions, and used ammonium sulfate to precipitate the complex. The authors chose 17-beta-E2 as ligand because the plasma steroid binding system has not been shown to be homogeneous and because this binding function may vary independently for the different steroids. In these patients, the E2 binding was significantly (P less than 0.01) increased (85 +/- 11 pg/ml and 73 +/- 13 pg/ml in premenopausal and postmenopausal) compared to the normal controls (59 +/- 7 pg/ml and 58 +/- 5 pg/ml in premenopausal and postmenopausal women. It is still unclear whether this is a primary increase of the binding capacity or a reaction of the host for sequestering excess circulating E2. However, the small percentage of false-positives and false-negatives suggests that E2 binding could be used as a tumor marker in breast carcinoma.

Current status of hormone receptor measurements in cancer patients.

Despite increasingly sophisticated techniques, improvements in the correlation between laboratory findings and tumor response to endocrine therapy have not been obtained by hormone receptor studies. A possible explanation is that present knowledge of the mechanisms of the endocrine stimulus is incomplete. Some aspects of the present model, (elevated conjugated steroid levels, multiplicity of the plasma proteins capable of binding hormones, pulsatility of the plasma protein bond and of the receptor system for steroids), are still unclear and thus are not used in diagnosis. By evaluating these factors it will probably be possible to correlate better laboratory data with clinical findings.

Development of laboratory hormone tests and their application in the monitoring of cancer patients.

In the endocrinologic study of dysplastic and neoplastic pathologies of hormone-dependent organs we propose the determination not only of the plasma levels of the "total" hormone but also those of the free hormone as well as the plasma/hormone binding capacity and the kinetics of the plasma/steroid interaction.