[Intranodal lymphangiography in pediatric chylothorax, a diagnostic and therapeutic tool]. / Linfangiografía intranodal en quilotórax pediátrico, una herramienta diagnóstica y terapéutica.

INTRODUCTION: High morbidity has been described in secondary chylothorax. Thoracic duct embolization (TDE) after intranodal lymphangiography (IL) is one of the treatments in adults but there is poor experience in children. We aim to describe our experience with this technique for refractory pediatric chylothorax. METHODS: A retrospective study of patients with refractory chylothorax treated with thoracic duct embolization at our Institution in the last 4 years was performed. Lymphatic vessels visualization was obtained by intranodal lymphangiography with ethiodized oil. Demographic and clinical data as well as imaging findings were collected. RESULTS: A total of 4 patients were treated during the study period with a median of age and weight of 2.5 months (1-16) and 4.25 kg (2.8-10) respectively. Chylothorax was secondary to cardiothoracic surgery in 3 patients and to venous thrombosis in the other one. Medical treatment was provided during a median of 47 days (13-56) without benefit in thoracic output [median: 46 ml/kg/day (19-64)]. After IL, thoracic duct catheterization was achieved in one patient however embolization was not possible. Chylothorax stopped in the 3 post-surgical patients regardless of how much lymphatic visualization was achieved in IL. In the venous thrombosis patient surgical treatment was performed 6 days after the study. CONCLUSION: IL can be a diagnostic and therapeutic tool in children. Ethiodized oil seems to seal lymphatic leak in postsurgical chylothorax. IL could be an option for chylothorax in patients too sick for surgical treatment or in whom thoracic duct embolization is not feasible.

INTRODUCCION: El quilotórax secundario es una entidad rara con una alta morbilidad. La embolización del conducto torácico (CT) mediante linfangiografía intranodal (LI) con aceite etiodizado (AE) forma parte del arsenal terapéutico del quilotórax en el adulto. Presentamos nuestra experiencia con esta técnica en pacientes pediátricos con quilotórax refractario al tratamiento médico. METODOS: Estudio retrospectivo de los pacientes tratados en nuestro centro por quilotórax refractario con LI en los últimos 4 años. Se recogieron los datos epidemiológicos, clínicos, terapéuticos y linfangiográficos. RESULTADOS: Se identificaron 4 pacientes, con unas medianas de edad y peso de 2,5 meses (1-16) y 4,25 kg (2,8-10) respectivamente. En 3 de los pacientes el quilotórax fue secundario a cirugía cardiaca y en el restante a trombosis extensa de vena cava superior. La mediana de débito fue de 46 ml/kg/día (19-64) y la de tiempo de tratamiento médico de 47 días (13-56). En todos ellos se realizó LI, opacificándose el CT solo en un paciente, sin lograrse la embolización. A pesar de ello, tras la LI, el quilotórax cesó en el grupo postquirúrgico independientemente del nivel de opacificación del árbol linfático. En el paciente secundario a trombosis, se realizó ligadura quirúrgica del CT 6 días después del estudio. CONCLUSIONES: La LI es una técnica diagnóstica e incluso terapéutica en casos de quilotórax refractario, que comienza a ser necesaria y realizable en centros con experiencia. El AE parece sellar la fuga linfática por un mecanismo embolizante en casos postquirúrgicos, eliminando la necesidad del cierre quirúrgico.

[Gynecological abnormalities in patients with rectovestibular fistula]. / Malformaciones ginecológicas en pacientes con fístula recto vestibular.

Patients with recto vestibular fistula may have gynecological malformations that could be unnoticed at the initial examination. The aim of this paper is to demonstrate the incidence of these malformations and propose a study method to help diagnose these malformations, avoiding unnecessary surgeries. We reviewed the records of patients treated with rectovaginal fistula (RVF) in the last 18 years and studied their gynecological malformations, time at diagnosis and treatment received. Of the 39 patients treated, 5 of them (13.1%) demonstrated 9 gynecological malformations: Hemivaginas (2), hemiuteros (2), uterine agenesis (2), vaginal agenesis (2) and vaginal septum (1). The diagnosis was made after the posterior sagittal approach (PSA) in two patients (acute abdomen and hydrometrocolpos), during the PSA in 2 patients and only one of them was diagnosed before the PSA. The 2 patients with hemivaginas and hemiuterus underwent a hemihysterosalpinguectomy and a vaginoplasty later in adolescence. The patient with vaginal and uterine agenesis diagnosed prior to PSA underwent a posterior sagittal anorectoplasty and a vaginoplasty with colon in the same procedure. The patient with vaginal and uterine agenesis (age 13 months) is waiting for vaginal replacement. The patient with vaginal septum (intraoperative finding) underwent a septum resection during the PSA. Gynecological defects are part of RVF spectrum. Girls with RVF require a complete gynecological examination prior to the definitive repair. Preoperative examinations assist in the timing and type of repair, and ultimately avoids complications and unnecessary interventions.

La fístula recto-vestibular se puede asociar a anomalías ginecológicas que, en numerosas ocasiones, pasan inadvertidas en la exploración inicial. Su reconocimiento en el momento adecuado puede cambiar el plan terapéutico y el pronóstico. Se revisan las historias de las pacientes con fístula recto-vestibular de los últimos 18 años y se describen las malformaciones ginecológicas asociadas, el momento del diagnóstico, el tratamiento y resultado postoperatorio. De 39 pacientes, en 5 (12,8%) se observaron 12 malformaciones ginecológicas: hemivaginas (2), hemiúteros (2), agenesia uterina (2), agenesia vaginal (2) y tabique vaginal (3). En dos pacientes el diagnóstico se realizó durante la anorrectoplastia, en otras dos después de la anorrectoplastia sagital posterior a causa de hidrometrocolpos y solo en una de ellas, antes de la intervención. En las pacientes con hemivagina y hemiútero se realizó, en una, la extirpación del hemiútero y la trompa y, en la otra, plastia vaginal transformándola en una única vagina. Cuando el diagnóstico se hizo antes de la intervención se pudo planificar la plastia adecuadamente. En la paciente con tabique vaginal y hallazgo intraoperatorio la anomalía genital fue tratada durante la anorrectoplastia. La paciente con agenesia vaginal y uterina aún no ha sido intervenida. Las malformaciones ginecológicas se asocian con relativa frecuencia a la fístula recto-vestibular. Por ello se requiere una exploración ginecológica adecuada antes de la anorrectoplastia para poder planificar de manera correcta el momento de la reparación, evitando complicaciones e intervenciones innecesarias. intraútero, la invaginación intestinal postnatal en el prematuro y la invaginación intestinal postnatal en el neonato a término.

[Intussusception: hospital admission for risk of recurrence or early discharge?] / Invaginación intestinal: ¿alta precoz o ingreso por riesgo de recidiva?

INTRODUCTION/PURPOSE: There is current debate about the need of hospitalization of patients with enema-reduced intussusception. The purpose of this study is to describe intussusception recurrence in a tertiary care children's hospital in order to evaluate the feasibility of ambulatory treatment. PATIENTS AND METHODS: Retrospective review of children diagnosed with intussusception from January 2009 to December 2013, identifying early recurrences as those that occurred between 12-72 hours after successful enema reduction and comparing the results with current literature. RESULTS: A total of 121 children (77 male - 44 female), with a mean age of 18,9±2,7 months and weight of 10,77±0,57 kg (CI 95%) were treated for intussusception. Enema reduction was attempted in 90,7% (n= 88) of the cases, with a success rate of 76,1% (n= 67). Early recurrence rate was 6% (n= 4), without associated complications, which is similar to recent meta-analysis results (5,4%); however, three patients required surgical exploration. Mean length of stay was 2 days for enema-reduced intussusception, which resulted in a total cost of 2,076.67 euro per patient. CONCLUSION: The low recurrence rate and scarce risk of complications suggests that an 8 to 12 hour observation is a feasible alternative to hospital admission, which results in social advantages including family welfare as well as management costs. These results are a starting point for prospective randomized controlled trials comparing both treatment modalities.

INTRODUCCION/OBJETIVO: En la literatura actual existe debate en cuanto a la necesidad de ingresar a los pacientes con invaginación intestinal (II) después de la reducción exitosa mediante enema. El propósito de este estudio es caracterizar la recidiva de las II en nuestro medio para valorar la posibilidad del tratamiento ambulatorio. PACIENTES Y METODOS: Estudio retrospectivo de los niños atendidos por II entre 2009 y 2013 definiendo como recidiva temprana la que ocurre entre las 12-72 horas post-reducción, comparando los resultados con la literatura actual. RESULTADOS: Se trataron 121 niños (77 varones - 44 mujeres), con edad de 18,9±2,7 meses y peso de 10,77±0,57 kg (IC 95%), por II. Se intentó reducción mediante enema en 90,7% (n= 88) de los casos, siendo efectivo en un 76,1% (n= 67). La tasa de recidiva temprana fue del 6% (n= 4), sin complicaciones asociadas, similar a lo referido en estudios de meta-análisis recientes (5,4%); tres precisaron tratamiento quirúrgico. La estancia hospitalaria media es de 2 días para las II tratadas conservadoramente, lo que supuso un gasto promedio de 2.076,67 euros por ingreso. CONCLUSION: Dada la baja tasa de recidiva temprana y escaso riesgo de complicaciones, la observación durante 8-12 horas es una alternativa al ingreso hospitalario, lo que conllevaría ventajas de bienestar socio-familiar y de gestión. Estos resultados sirven como punto de partida para estudios prospectivos randomizados entre ambas modalidades de tratamiento.

ß1 integrin controls EGFR signaling and tumorigenic properties of lung cancer cells.

Lung cancer is the leading cause of cancer death worldwide. The epidermal growth factor receptor (EGFR) represents the main target for non-small cell lung cancer (NSCLC) therapy, as its overexpression or constitutive activation contributes to malignancy and correlates with poor prognosis. Our previous work demonstrated that in epithelial cells ß1 integrin is required for propagating EGFR signaling from the plasma membrane to the nucleus. In this study, we silenced ß1 integrin in human NSCLC A549 cells. The ß1 integrin-silenced cells show a defective activation of the EGFR signaling cascade, leading to decreased in vitro proliferation, enhanced sensitivity to cisplatin and Gefitinib, impaired migration and invasive behavior. Inhibitory effects on tumor growth and on the EGFR pathway were also observed in in vivo experiments. Moreover, ß1 integrin silencing increases the amount of EGFR on the cell surface, suggesting that ß1 integrin is required for efficient constitutive EGFR turnover at the cell membrane. Although the rate of EGF internalization and recycling is not affected in silenced cells, EGFR signaling is recovered only by expression of the Rab-coupling protein RCP, indicating that ß1 integrin sustains the endocytic machinery required for EGFR signaling. Overall, these results show that ß1 integrin is an essential regulator of EGFR signaling and tumorigenic properties of lung cancer cells, and that its silencing might represent an adjuvant approach to anti-EGFR therapy.

Aberrant methylation within RUNX3 CpG island associated with the nuclear and mitochondrial microsatellite instability in sporadic gastric cancers. Results of a GOIM (Gruppo Oncologico dell'Italia Meridionale) prospective study.

BACKGROUND: Gastric cancer (GC) development is a multistep process, during which numerous alterations accumulate in nuclear and mitochondrial DNA. A deficiency of repair machinery brings about an accumulation of errors introduced within simple repetitive microsatellite sequences during replication of DNA. Aberrant methylation is related to microsatellite instability (MSI) by the silencing of the hMLH1 gene. The aim of this study is to investigate a possible relationship between the RUNX3 promoter methylation, nuclear microsatellite instability (nMSI) and mitochondrial microsatellite instability (mtMSI), in order to clarify its biological role in GC. PATIENTS AND METHODS: nMSI and mtMSI were evaluated in a consecutive series of 100 GC patients. For the analysis of the nMSI, we followed the National Cancer Institute guidelines. mtMSI was assessed by analyzing a portion of the displacement-loop region. The aberrant methylation of RUNX3 was analyzed in 40 GC patients by methylation-specific PCR. RESULTS: Overall, 55% of GC demonstrated methylation of the RUNX3 promoter; 82% of GC was classified as stable microsatellite instability, 5% as low-level microsatellite instability and 13% as high-level microsatellite instability (MSI-H); mtMSI was detected in 11% of GC. A significant association was found between mtMSI and tumor-node-metastasis staging, furthermore an interesting association between MSI-H status, mtMSI and RUNX3 methylation. CONCLUSION: These data suggest that RUNX3 is an important target of methylation in the evolution of mtMSI and nMSI-H GC.

Significance of P16INK4A hypermethylation gene in primary head/neck and colorectal tumors: it is a specific tissue event? Results of a 3-year GOIM (Gruppo Oncologico dell'Italia Meridionale) prospective study.

BACKGROUND: Methylation of the p16 promoter is one of the most frequent mechanisms of gene inactivation; its incidence is extremely variable according to the type of tumor involved. Our purpose was to analyze the hypermethylation of the p16 promoter in laryngeal squamous cell carcinomas (LSCC), salivary gland (SG) tumors and in colorectal cancer (CRC), to detect any possible association with the clinicopathological features and to determine the prognostic significance of the p16 gene in the tumors analyzed. PATIENTS AND METHODS: The hypermethylation of the p16 promoter was prospectively analyzed, by MSP, in a consecutive series of 64 locally advanced LSCC patients, in a consecutive series of 33 SG tumor patients and in a consecutive series of 66 sporadic CRC patients. RESULTS: Hypermethylation was observed in 9% of the LSCC cases, in all cases of SG cancer and in 21% of the CRC cases. No significant association was observed between p16 hypermethylation and clinicopathological variables in all the tissue samples analyzed. Moreover at univariate analysis p16 mutations were not independently related at disease relapse and death in LSCC and CRC. CONCLUSIONS: The results of this study suggest that the lack of p16 function could happen in advanced stage of SG tumors.

Detection and quantification of mammaglobin in the blood of breast cancer patients: can it be useful as a potential clinical marker? Preliminary results of a GOIM (Gruppo Oncologico dell'Italia Meridionale) prospective study.

BACKGROUND: Mammaglobin is expressed mainly in mammary tissue, overexpressed in breast cancer (BC) and rarely in other tissue. The aim of this study was to assess the sensitivity and specificity of transcript MGB1 detection and to evaluate the role of MGB1 as potential clinical marker for the detection of disseminated cancer cells in the blood of BC patients. PATIENTS AND METHODS: A consecutive series of 23 BC tissues, 36 peripheral blood BC samples and 35 healthy peripheral blood samples was prospectively recruited to investigate MGB1 expression by means of a quantitative Real Time RT-PCR assay. RESULTS: MGB1 overexpression in tissue samples of BC patients is significantly associated only with high level of Ki67 (P <0.05). None of the samples from peripheral blood of 35 healthy female individuals were positive for MGB1 transcript. In contrast MGB1 mRNA expression was detected in three of 36 (8%) peripheral blood of BC patients. CONCLUSIONS: Our preliminary results demonstrate that the detection of MGB1 transcript in peripheral blood of BC patients was specific but with low sensitivity. MGB1 overexpression by itself or in combination with Ki67 might be considered an index of BC progression.

DNA ploidy and S-phase fraction, but not p53 or NM23-H1 expression, predict outcome in colorectal cancer patients. Result of a 5-year prospective study.

PURPOSE: The aim of this study was to determine TP53 and NM23-H1 immunoreactivity, DNA ploidy, and S-phase fraction (SPF) in a series of 160 patients undergoing resective surgery for primary operable colorectal cancer (CRC) and to establish whether these alterations have any clinical value in predicting CRC patients' prognosis. METHODS: TP53 and NM23-H1 expressions were evaluated on paraffin-embedded tissue by immunohistochemistry and DNA-ploidy and SPF on frozen tissue by flow-cytometric analysis. RESULTS: The median follow-up time in our study group was 71 months (range 34-115 months). P53 protein expression was associated with distal tumors (P<0.05) and DNA aneuploid tumors (P<0.05) tumors. DNA-aneuploidy was associated with distal tumors (P<0.01), histological grade (G3) (P<0.05), advanced Dukes' stage (C and D) (P<0.01), lymph node metastases (P<0.01) and high SPF (>18.3%) (P<0.01). The major significant predictors for both disease relapse and death were advanced Dukes' stage, DNA-aneuploidy, and high SPF, while lymphohematic invasion was the only independent factor for relapse and non-curative resection for death. CONCLUSIONS: Our results indicate that DNA aneuploidy and high SPF are associated in CRC with a poor clinical 5-year outcome, while in contrast the prognostic role of TP53 and NM23-H1 expression is still to be clarified.

DNA aneuploidy and high proliferative activity but not K-ras-2 mutations as independent predictors of clinical outcome in operable gastric carcinoma: results of a 5-year Gruppo Oncologico dell'Italia Meridonale (GDIM) prospective study.

BACKGROUND: The prognostic value of DNA ploidy, S-phase fraction (SPF) and K-ras-2 mutations in gastric carcinoma (GC) has not yet been clearly defined. The aim of this study was to clarify the association between biomolecular variables, tumor characteristics, and clinical outcome in GC patients. METHODS: Resected specimens from a consecutive series of 69 patients with GC who underwent potentially curative surgery were studied prospectively. DNA ploidy and SPF were assessed by flow cytometry on multiple frozen tumor samples, whereas K-ras-2 mutations were detected by polymerase chain reaction followed by single-strand conformation polymorphism. All the patients involved in this study were followed up for a mean of 95 months. RESULTS: DNA aneuploidy was present in 72% of the cases (50 of 69), whereas 10% of these (5 out of 50) showed multiclonality. Mutations of K-ras-2 were detected in 8% of the tumors (5 of 63). Both DNA ploidy and SPF were associated with TNM stage (American Joint Committee on Cancer [AJCC] staging system) and node status. Moreover, DNA aneuploidy was significantly related to high SPF. K-ras-2 mutations were not associated with clinicopathologic variables or flow cytometric indicators. At univariate analysis, advanced TNM stage, node involvement, diffuse histotype, depth of invasion, DNA aneuploidy, and high SPF proved to be significantly related to quicker tumor relapse and to shorter overall patient survival. With multivariate analysis, DNA aneuploidy, high SPF, and depth of invasion were related to risk of tumor relapse and patient death, whereas diffuse histotype was independently related to patient risk of tumor relapse. CONCLUSIONS: DNA ploidy and SPF, when associated with clinicopathologic staging, might be useful for the identification of GC patients who have different risks for death or relapse of disease.

[The use of stereotaxic cytology in the diagnosis of nonpalpable breast lesions. Our experience]. / L'impiego della citologia stereotassica nella diagnostica delle lesioni non palpabili della mammella. Nostra esperienza.

BACKGROUND AND AIMS: The increasingly frequent use of mammography for the early diagnosis of breast cancer and the consequent identification of mammary lesions at a preclinical stage raises the fundamental problem of the differential diagnosis between non-suspected non-palpable lesions (NPL) which can therefore be monitored over time and suspected NPL or definite carcinoma requiring histological confirmation and surgical biopsy. The diagnostic accuracy of mammography alone is not sufficiently high to differentiate benign lesions from malignant or strongly suspected ones. The use of surgical biopsy in the event of suspected NPL could be significantly reduced by the use of stereotaxic cytology which would improve the diagnostic accuracy of mammography. METHODS: The study refers to 72 suspected NPL undergoing surgical biopsy after having performed stereotaxic cytology on a sample taken with a dedicated mammographic device (Mammotest-TRC). RESULTS: The rate of inadequate samples for correct cytological evaluation was 16.1%. Of the 72 NPL undergoing surgical biopsy, 40 (55.5%) were found to be carcinomas and 32 (44.5%) were benign lesions. The sensitivities of mammography alone and cytology alone in identifying infraclinical breast carcinoma were respectively 0.85 and 0.95. If the results of the two methods were evaluated together, the level of sensitivity was 0.98. CONCLUSIONS: The use of stereotaxic cytology enables a marked improvement to be achieved in the diagnostic accuracy of mammography for the identification of suspected NPL to undergo surgical biopsy, notably reducing the cost of biopsy (number of benign lesions for each carcinoma diagnosed) and consequent discomfort for patients.

Prognostic significance of proliferative activity, DNA-ploidy, p53 and Ki-ras point mutations in colorectal liver metastases.

Paired colorectal liver metastases (CLM) and normal tissue samples from a consecutive series of 36 patients were studied prospectively. MIB-1 expression was studied by immunohistochemistry on paraffin-embedded sections. DNA ploidy and S-phase fraction (SPF) measurements were performed by flow cytometry on frozen tissues. Mutations within the p53 (exons 5-8) and c-Ki-ras (codons 12 and 13) genes were detected by PCR single-strand conformation polymorphism analysis followed by sequencing. A high correlation was observed between the MIB-1 LI and SPF value (rho=0.81; P<0.01). Moreover, p53 gene mutations were associated with either high MIB-1 LI and high SPF. In univariate analysis, SPF and MIB-1 levels were related to risk of death. The association between overall survival and DNA-ploidy or p53 mutations did not reach statistical significance, but a slightly better survival was observed for patients either with DNA-diploid tumours or without mutations (P=0.05 and P=0.06, respectively). SPF was shown by multivariate Cox model analysis to be an independent prognostic variable and thus it might be a useful prognostic factor in patients with CLM.

Biological characterization of laryngeal squamous-cell carcinoma.

The traditional prognostic factors, including stage of disease and tumour grade, have shown a limited prognostic significance and an inability to predict clinical response to specific treatment in patients with laryngeal squamous-cell carcinoma. More recent data suggest that cell kinetics indices, DNA-ploidy, lysosomal cysteine proteinase expression and genetic changes of both tumour suppressor genes and protooncogenes may be considered as reliable and reproducible indicators of biological aggressiveness in these patients. Moreover, the frequency of different genetic alterations suggests that several pathways are involved in the genesis of these neoplasias and, in particular, it is very probable that p-53 expression and PCNA indices (increased in normal mucosa and preinvasive lesions) may constitute more important biomarkers for the early steps of laryngeal carcinogenesis.

Pleomorphic adenoma and adenoid-cystic carcinoma of salivary glands: immunohistochemical assessment of proliferative activity in comparison with flow-cytometric study.

In this study, 32 pleomorphic adenomas (PAs) and seven adenoid cystic carcinomas (ACCs) were analysed for the evaluation of proliferating cell nuclear antigen (PCNA) indices and flow cytometric variables. Our aim was to assess any possible relationship between these parameters and the clinico-pathological variables and to clarify their histogenesis and reasons for their biological differences. The tumours were divided into three groups, mainly epithelial (E), myxoid (M) and chondroid (C); PCNA labelling index (LI) and weighted mean index (WI) and the WI/LI ratio were analysed in the predominant components; a single PCNA index, weighted by the percentage of each component, was also calculated. Only WI/LI was found to be significantly different in the three components, while PCNA single index did not show either significant differences by sex, age, site and size, or any correlation with the S phase fraction. A significant difference was found between PAs and ACCs by site (P < 0.01) and DNA ploidy (P < 0.05); furthermore, all PCNA indices (single index) were significantly lower in PAs than in ACCs.

nm23-H1 protein immunohistochemical expression in human breast cancer.

A series of 76 patients undergoing surgery for primary breast carcinoma has been prospectively studied in order to evaluate the relative weight of nm23-H1 protein expression in disease-free survival. Expression of nm23 protein was immunohistochemically assessed. In all, 39% (29/74) of the turners showed positive staining for nm23-H1 protein expression. Negative nm23-H1 expression was found in poorly differentiated, tumors (p<0.02). There was no significant relationship between nm23-H1 and the other clinicopathological and biological features examined. In the univariate statistical analysis, node positivity, G3 histological grade and high flow cytometric S phase fraction (SPF) value proved to be significantly related to risk of relapse. In the multivariate analysis, only histological grade (G3) and high SPF values (>10.6) proved to be independently related to risk of relapse, with a hazard ratio of 9.84 and 7.98 respectively. Our preliminary study suggests that immunohistochemical nm23-H1 expression should not be considered a marker for predicting tumor progression and patient prognosis.

Prognostic significance of cell kinetics in laryngeal squamous cell carcinoma: clinicopathological associations.

A consecutive series of 99 untreated patients undergoing radical surgical resection for stage I-IV laryngeal carcinomas has been studied prospectively. Our purpose was to analyze the predictive relevance of proliferative variables studied [proliferating cell nuclear antigen (PCNA) expression, volume-corrected mitotic (M/V) index, and S-phase fraction (SPF)] on clinical outcome in relation to DNA ploidy and clinicopathological features. All of the patients were followed up for a median of 32 months (range, 5-58 months). A weak, but significant, positive correlation was found between M/V and PCNA indices (except the PCNA weighted mean index:labeling index ratio) or these indices and SPF. At univariate analysis, node positivity (P < 0.05), poor histological grade (P < 0.01), DNA aneuploidy (P < 0.01), a high SPF (P < 0.01), and a high M/V index (P < 0.05) proved to be related significantly to quicker relapse, whereas T4 (P < 0.05), subglottic site (P < 0.05), DNA aneuploidy (P < 0.01) and a high SPF (P < 0.01) were related significantly to shorter overall survival. With multivariate analysis, a high SPF (> 12.1%) and histological grade (G3) were related to the risk of relapse (relative risk, 8.65 and 5.45, respectively), whereas only a high SPF was related independently to the risk of death (relative risk, 7.30). Our study has identified SPF, in addition to histological grade, as an important biological indicator in laryngeal carcinomas.

Chick embryo retina development in vitro: the effect of insulin.

In this paper we study the development of chick embryo retina cultured in vitro and the effects exerted by insulin. Retinas were removed from 7-day embryos and cultured in serum- and hormone-free medium for 7 additional days. Under these conditions retinal cells survived and underwent cholinergic differentiation, as previously ascertained by Hausman et al. (Dev. Brain Res., 1991, 59: 31-37). However, a great retardation of development was noted compared to uncultured control, 14-day retina. In fact both wet weight and DNA and protein content increased much slower than in ovo and the tubulin content decreased below even the starting value. In addition, although after 7 days in culture retinal cells were organized in identifiable layers, nevertheless the typical organization equivalent to 14-day in ovo retina was absent. The addition of insulin in the medium markedly increased the wet weight of cultured retinas, their protein content and the level of tubulin pools, particularly that of non-assembled fraction. Nevertheless insulin did not modify DNA synthesis and did not induce the increment of both neuron specific enolase and actin. Morphological observations show that insulin markedly increased the number and the thickening of the fiber layers. These results, together with the facts that retina synthesizes and secretes insulin and possesses specific insulin receptors suggest that insulin can have autocrine or paracrine regulatory functions in retinal development by exerting a general effect on retinal growth and a more specific one on tubulin production.

Vimentin expression, proliferating cell nuclear antigen and flow cytometric factors. Prognostic role in breast cancer.

A series of 71 patients undergoing surgery for primary breast carcinoma was prospectively studied in order to evaluate the relative weight for four biologic factors (intermediate filament vimentin expression, proliferating cell nuclear antigen [PCNA], flow cytometric DNA ploidy and S-phase fraction) and of several clinicopathologic and biologic features in predicting clinical outcome (disease-free interval). In univariate statistical analysis, positivity of axillary nodes, high number of mitoses, high nuclear grade, high histologic grade, positivity of vimentin, high flow cytometric S-phase fraction (FCM-S) value, high PCNA and high silver-stained nuclear organizer regions scores were significantly related to risk of relapse. In multivariate analysis (Cox's logistic regression) only histologic grade (3) and high FCM-S values (> 10.7) were independently related to risk of relapse, with hazard ratios of 9.84 and 7.98, respectively. The results of our preliminary, prospective study suggest that FCM-S, in addition to morphologic criteria (histologic grade), may be an important biologic indicator in determining breast cancer patients' prognosis.

p53 expression in human renal cell carcinoma: an immunohistochemical study and a literature outline of the cytogenetic characterization.

In this study both the incidence and pattern of p53 over-expression in various histological subtypes of a series of 36 cases of renal cell Grawitz carcinoma, partially studied in a previous paper, were analyzed. This series consisted of these histologic subtypes: clear cell non papillary (18 cases), clear cell papillary (2 cases), granular cell (5 cases), mixed (clear and granular cell) (9 cases) and spindle cell (2 cases). At present, our aim was, firstly, to see which were the best technical conditions for detection of p53 in the available paraffin-embedded tumor specimens, using several antibodies, specific for various epitopes; secondly, to investigate if some relation might exist between this expression and the histological features of these tumors. Twenty-five per cent (9/36 cases) resulted p53 immunoreactive, the highest percentage being represented in the papillary clear and granular cell carcinomas; low expression was detected in 11 cases (30%) and no reactivity in 16 cases (44%). Neither technical or dilution modifications proved to transform these latter results; however, detection was maximal using the CM-1 polyclonal rabbit antiserum. Thus, in RCC, expression of p53, analyzed in the light of the cytogenetic characterization through a literature review, resulted at low frequency. This finding means that mutation of the p53 gene are not frequent in the neoplastic transformation in RCC. Nevertheless, in spite of the small number of cases and of the short follow-up period of this study, detection of p53 positivity in tumors with either high grade and stage or high proliferative activity could suggest that p53 mutations lead to tumors of a more aggressive type.(ABSTRACT TRUNCATED AT 250 WORDS)

P53 expression in stage iii-iv squamous-cell carcinoma of the larynx - an immunohistochemical study related to clinicopathological, flow-cytometric DNA analysis and prognosis.

A series of 71 patients undergoing radical surgical resection for stage III and IV laryngeal carcinoma (LC) consecutively diagnosed was prospectively studied in order to evaluate the relative weight of p53 expression in predicting clinical outcome, All the patients taking part in this study were followed up for a median of 18 months (range: 6-41 months). Positive staining for p53 protein was detected in 44 of 71 (62%) of these tumors on paraffin-embedded tissue, even in dysplastic areas. Among the clinico-pathological and biological parameters analyzed, only flow-cytometric S-phase (FCM-S) Values of turners showed a significant relationship to p53 immunostaining (p=0.01). With Kaplan-Meier estimation, in multivariate analysis only high FCM-S (>15.1) was independently related to risk of relapse (RR=5.82), while both FCM-S and site (subglottis) were related to risk of death (RR=6.83 and RR=14.3, respectively). These findings indicate that p53 immunoreactivity, though of no utility as a prognostic indicator, probably plays a role in the early stages of LC tumorigenesis.