Comment on: ‘Screening’ for Breast Cancer: Misguided Research Misinforming Public Policies, by O. S. Miettinen

Our commentary of the article “‘Screening’ for Breast Cancer: Misguided Research Misinforming Public Policies” has two main parts. First we address some of the methodological points raised by Professor Miettinen. Then we review more specific aspects of the Swiss Medical Board statement on mammography screening for early detection of breast cancer.

Multivariate monitoring of a biological wastewater treatment process: a case study at Melbourne Water's Western Treatment Plant

Biological wastewater treatment is a complex, multivariate process, in which a number of physical and biological processes occur simultaneously. In this study, principal component analysis (PCA) and parallel factor analysis (PARAFAC) were used to profile and characterise Lagoon 115E, a multistage biological lagoon treatment system at Melbourne Water's Western Treatment Plant (WTP) in Melbourne, Australia. In this study, the objective was to increase our understanding of the multivariate processes taking place in the lagoon. The data used in the study span a 7-year period during which samples were collected as often as weekly from the ponds of Lagoon 115E and subjected to analysis. The resulting database, involving 19 chemical and physical variables, was studied using the multivariate data analysis methods PCA and PARAFAC. With these methods, alterations in the state of the wastewater due to intrinsic and extrinsic factors could be discerned. The methods were effective in illustrating and visually representing the complex purification stages and cyclic changes occurring along the lagoon system. The two methods proved complementary, with each having its own beneficial features. (C) 2003 Elsevier B.V. All rights reserved.

Age and Method-dependent Variability of Predicted Oxygen Consumption in Congenital Heart Disease

Background and Purpose. There has been a lot of debate about the use of predicted oxygen consumption to calculate pulmonary vascular resistance using the Fick principle. We therefore comparatively analyzed predicted oxygen consumption in infants and children in specific age groups, using different methods (formulas), as an attempt to better understand the usefulness and limitations of predictions. Methods and Results. Four models (LaFarge & Miettinen, Bergstra et al., Lindahl, and Lundell et al.) were used to predict oxygen consumption in 200 acyanotic patients with congenital cardiac defects aged 0-2.0, > 2.0-4.0, > 4.0-6.0, and > 6.0-8.75 years (median 2.04 years). Significant differences were observed between the age groups (P < .001) and between the methods (P < .001), not related to diagnoses. Differences between methods were more impressive in the first age group (P < .01). In patients aged 0-2.0 years, the lowest values of oxygen consumption (corresponding to the highest estimates of pulmonary vascular resistance) were obtained with the method of Lindahl; above this age, any method except that of Lundell et al. Conclusions. Although measuring oxygen consumption is always preferable, a rational use of predictions, using different methods, may be of help in situations where measurements are definitely not possible.

Mild myocardial infarction - A classification problem in epidemiologic studies

In studies assessing the trends in coronary events, such as the World Health Organization (WHO) MONICA Project (multinational MONItoring of trends and determinants of CArdiovascular disease), the main emphasis has been on coronary deaths and non-fatal definite myocardial infarctions (MI). It is, however, possible that the proportion of milder MIs may be increasing because of improvements in treatment and reductions in levels of risk factors. We used the MI register data of the WHO MONICA Project to investigate several definitions for mild non-fatal MIs that would be applicable in various settings and could be used to assess trends in milder coronary events. Of 38 populations participating in the WHO MONICA MI register study, more than half registered a sufficiently wide spectrum of events that it was possible to identify subsets of milder cases. The event rates and case fatality rates of MI are clearly dependent on the spectrum of non-fatal MIs, which are included. On clinical grounds we propose that the original MONICA category ''non-fatal possible MI'' could bt:divided into two groups: ''non fatal probable MI'' and ''prolonged chest pain.'' Non-fatal probable MIs are cases, which in addition to ''typical symptoms'' have electrocardiogram (EGG) or enzyme changes suggesting cardiac ischemia, but not severe enough to fulfil the criteria for non-fatal definite MI In more than half of the MONICA Collaborating Centers, the registration of MI covers these milder events reasonably well. Proportions of non-fatal probable MIs vary less between populations than do proportions of non fatal possible MIs. Also rates of non-fatal probable MI are somewhat more highly correlated with rates of fatal events and non-fatal definite MI. These findings support the validity of the category of non-fatal probable MI. In each center the increase in event rates and the decrease in case-fatality due to the inclusion of non-fatal probable MI was lar er for women than men. For the WHO MONICA Project and other epidemiological studies the proposed category of non-fatal probable MIs can be used for assessing trends in rates of milder MI. Copyright (C) 1997 Elsevier Science Inc.

António Manuel Pinto Barbosa, economista e governante

António Manuel Pinto Barbosa (1917-2006), incluído entre os “Cem portugueses que moldaram o século XX” no Expresso Revista foi biografado por João César das Neves e Francisco Azevedo e Silva num livro publicado em 1999, cujo capítulo 7 o intitula “Decano dos economistas”. A sua actividade na Faculdade de Economia da Universidade Nova de Lisboa, que fundou em 1978 e onde foi homenageado em 1989, e sobretudo na Academia das Ciências de Lisboa foram porém menosprezadas nesse trabalho. Este elogio tenta reparar a falha, focando ainda o problema dos desequilíbrios da balança de pagamentos que tanto o preocuparam na Europa e no mundo, na medida em que interagem perigosamente com os desequilíbrios orçamentais, hipotecando a riqueza das nações. Aos complementos de texto acrescem anexos com referências e trabalhos consultados, o processo individual na Academia e contribuições recentes para a análise dos desequilíbrios externos na Zona Euro no espírito de Pentti Kouri (1949-2009).

António Manuel Pinto Barbosa, economista e governante

António Manuel Pinto Barbosa (1917-2006), economista e governante, foi incluído pelo Expresso Revista entre os “Cem portugueses que moldaram o século XX”. Biografado por João César das Neves e Francisco Azevedo e Silva num livro publicado em 1999, cujo capítulo 7 o intitula “Decano dos economistas”, mas a sua actividade na Faculdade de Economia da Universidade Nova de Lisboa, que fundou em 1978 e onde foi homenageado em 1989, e sobretudo na Academia das Ciências de Lisboa, é menos conhecida. Este escrito tenta reparar a falha e foca ainda o problema dos desequilíbrios da balança de pagamentos na Europa e no mundo que tanto o preocuparam, na medida em que interagem perigosamente com os desequilíbrios orçamentais, hipotecando a riqueza das nações. Inclui o elogio pronunciado em sessão conjunta da Academia das Ciências de Lisboa, 14/11/13 (cadeira nº 18L), o discurso de aceitação por Pedro Soares Martínez, decano da secção de direito e ciência política da Academia (cadeira 11L), pronunciado na mesma sessão, e um testemunho de Manuel Jacinto Nunes, que sucedeu a Pinto Barbosa enquanto decano dos economistas portugueses e da secção de economia e finanças da Academia (cadeira 8L), mas não estava na sessão. Seguem-se complementos incluíndo excertos duma análise dos desequilíbrios externos na Zona Euro no espírito de Pentti Kouri (1949-2009).

Enhancement of adhesion and promotion of osteogenic differentiation of human adipose stem cells by poled electroactive poly(vinylidene fluoride)

Poly(vinylidene fluoride) (PVDF) is a biocompatible material with excellent electroactive properties. Non-electroactive α-PVDF and electroactive β-PVDF were used to investigate the substrate polarization and polarity influence on the focal adhesion size and number as well as on human adipose stem cells (hASCs) differentiation. hASCs were cultured on different PVDF surfaces adsorbed with fibronectin and focal adhesion size and number, total adhesion area, cell size, cell aspect ratio and focal adhesion density were estimated using cells expressing EGFP-vinculin. Osteogenic differentiation was also determined using a quantitative alkaline phosphatase assay. The surface charge of the poled PVDF films (positive or negative) influenced the hydrophobicity of the samples, leading to variations in the conformation of adsorbed extracellular matrix (ECM) proteins, which ultimately modulated the stem cell adhesion on the films and induced their osteogenic differentiation.