Biomedical subjects

D Clayden

Publications and source records attributed to D Clayden.

10 recordsLinked to original sources

PubMed1999

The rise in incidence of lymphomas in Europe 1985-1992.

A collaborative study was carried out of the descriptive epidemiology of the lymphomas from seven countries across Europe in the period 1985-1992. Careful attention was paid to sources of information and the data quality in close collaboration with expert histopathologists. The data were classified as non-Hodgkin's lymphoma (NHL) and Hodgkin's disease (HD). An attempt was made to put the data into a modified version of the Revised European American Lymphoma (REAL) classification. We observed an overall rise in total NHL throughout the time period in all European countries but no such trend in HD. The increase in NHL overall being 4.2% per annum, representing an increase of 4.8% in males and 3.4% in females per annum, was only marked in middle and old age. Such increases were observed in all participating areas except in Burgundy. Different countries, however, have different base rates, the rates being highest in Scandinavia and the Netherlands. The analysis by subcategory classification suggested that the increase in NHL was confined to the follicle centre cell type, extranodal B-cell, nodal T-cell and nodal lymphomas not otherwise specified, categories. These new observations present a picture of real increase in case incidence with no obvious explanation. The increases in NHL do not appear to be due solely to better diagnoses. Pending other explanations or refutation, these present a compelling picture of an inexorable rise in incidence of this disease.

Adolescent↗

PubMed1998

The changing incidence of lymphoproliferative disorders in Yorkshire.

Secular trends in the incidence of lymphoproliferative disorders on North and West Yorkshire and Humberside from 1985 to 94 were studied and changes in incidence by tumour subtype were analysed. Population-based data on the incidence of lymphoproliferative disorders were obtained from a specialist registry with a high level of ascertainment. Cases of chronic lymphocytic leukaemia and plasma cell myeloma were excluded and the remaining cases classified as Hodgkin's disease and non-Hodgkin's lymphoma (NHL). NHL were subdivided by site of origin and immunophenotype. Nodal B-cell lymphomas were further classified as diffuse large B-cell lymphoma, follicle centre lymphoma, mantle cell lymphoma and miscellaneous. During the study period there was a significant increase in total lymphoproliferative disorders with an average change of 2.5% per annum equivalent to 0.84/10,0000. Most of this increase was due to an increasing incidence of extranodal B-cell lymphomas and peripheral T-cell lymphomas. A numerically small but significant increase in diffuse large B-cell lymphomas was seen. There was no significant increase in other subtypes. The increased incidence of lymphomas in the area studied is mainly due to changes in two specific subgroups. There are several reasons why changes in extranodal B-cell lymphoma and peripheral T-cell lymphoma may have been particularly affected by changing diagnostic practices. Epidemiological studies of particular subtypes of lymphoproliferative disorder facilitate the identification of environmental factors involved in the pathogenesis of these tumours.

Adolescent↗

PubMed1997

Changing trends in the incidence of non-Hodgkin's lymphoma in Europe. Biomed Study Group.

Non-Hodgkin's lymphoma (NHL) is not a uniform disease entity, and in order to investigate the reported changes in incidence we have set up a study in seven population-based cancer registries in Europe. The study is designed to look at changes in the incidence of total NHL and disease subgroups using standard definitions and methodology. The registries are based in Leeds, Dijon, Kuopio, Odense, Florence, Eindhoven, and Ragussa. The classification system we have used is based on the REAL classification and has utility for epidemiological studies. We have used it to convert data sets which have utilized both local cases and the ICD-O classification. In order to improve data reproducibility, CLL/LL, myeloma/MGUS, lymphoblastic disease, and Hodgkin's disease have been excluded because of the difficulty in defining incident cases accurately. The preliminary results of this study show that there is still an upward trend in incidence rate and that in Yorkshire this is 3% per annum in total NHL. The subgroups which are increasing are extranodal and nodal peripheral T-cell lymphoma. Similar increases in incidence have been reported for the other registries. We conclude that there is a continued upward trend in incidence of NHL, the causes of which are uncertain.

Europe↗

PubMed1990

Can the suicide rate be used as a performance indicator in mental illness?

This paper follows from an examination of death rates from suicide as a possible performance indicator in mental illness. The wide variations observed in the proportion of undetermined deaths to suicides in Yorkshire district health authorities, suggest that coroners differ in their legal definition of suicide. To counteract the problem of coroner bias it is suggested that deaths from suicide and self-inflicted injury, and deaths from injury undetermined, whether accidentally or purposely inflicted in the 15 and over age group be combined. The paper outlines the advantages of such a performance indicator and stresses that a 'poor' indicator value merely poses questions which lead to a search for reasons for the value and is not an explanation in itself.

Adolescent↗

PubMed1989