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B Laurence

Publications and source records attributed to B Laurence.

7 recordsLinked to original sources
PubMed2006

Clinical, cytogenetic and molecular characteristics of 14 T-ALL patients carrying the TCRbeta-HOXA rearrangement: a study of the Groupe Francophone de Cytogénétique Hématologique.

Recently, we and others described a new chromosomal rearrangement, that is, inv(7)(p15q34) and t(7;7)(p15;q34) involving the T-cell receptor beta (TCRbeta) (7q34) and the HOXA gene locus (7p15) in 5% of T-cell acute lymphoblastic leukemia (T-ALL) patients leading to transcriptional activation of especially HOXA10. To further address the clinical, immunophenotypical and molecular genetic findings of this chromosomal aberration, we studied 330 additional T-ALLs. This revealed TCRbeta-HOXA rearrangements in five additional patients, which brings the total to 14 cases in 424 patients (3.3%). Real-time quantitative PCR analysis for HOXA10 gene expression was performed in 170 T-ALL patients and detected HOXA10 overexpression in 25.2% of cases including all the cases with a TCRbeta-HOXA rearrangement (8.2%). In contrast, expression of the short HOXA10 transcript, HOXA10b, was almost exclusively found in the TCRbeta-HOXA rearranged cases, suggesting a specific role for the HOXA10b short transcript in TCRbeta-HOXA-mediated oncogenesis. Other molecular and/or cytogenetic aberrations frequently found in subtypes of T-ALL (SIL-TAL1, CALM-AF10, HOX11, HOX11L2) were not detected in the TCRbeta-HOXA rearranged cases except for deletion 9p21 and NOTCH1 activating mutations, which were present in 64 and 67%, respectively. In conclusion, this study defines TCRbeta-HOXA rearranged T-ALLs as a distinct cytogenetic subgroup by clinical, immunophenotypical and molecular genetic characteristics.

Adolescent↗
PubMed2002

Argon plasma coagulation for treatment of watermelon stomach.

BACKGROUND AND STUDY AIMS: Watermelon stomach or gastric antral vascular ectasia (GAVE) is a rare but well-recognized cause of gastrointestinal blood loss, which typically affects elderly women. Historically patients were treated with antrectomy but this has been largely replaced by endoscopic therapy such as Nd:YAG laser. Argon plasma coagulation (APC) is a new noncontact electocoagulation technique which has several theoretical advantages over laser. The objective of this study was to assess the efficacy of APC in treating GAVE. PATIENTS AND METHODS: We retrospectively reviewed the case-records of five patients (four women, one man) with iron deficiency anaemia or gastrointestinal blood loss due to GAVE who were treated with APC and for whom a follow-up of more than 12 months was available. Four patients were transfusion-dependent. Their mean age was 71 years (range 58 - 83). The mode of presentation, number of treatment sessions, response to therapy and recurrence (if any) were recorded. RESULTS: A mean of 2.6 treatment sessions per patient were required. All patients had an endoscopically observed response to therapy and all patients had a sustained rise in hemoglobin level after treatment. Transfusion dependence ceased in all patients. After a mean follow-up of 20 months GAVE recurred in two patients (40 %). Both patients responded to further APC treatment. No major complications were recorded. CONCLUSION: APC is a safe and effective short-term treatment for GAVE. The natural history of the condition is uncertain, and at medium-term follow-up GAVE is found to recur in a substantial number of patients treated with APC. Re-treatment with APC is an option in these patients.

Aged↗
PubMed1995

Jaundice: a clinical perspective.

The correct diagnosis in a jaundiced adult suggests itself clinically. A logical approach will avoid inappropriate tests, delays in diagnosis and unnecessary hospitalisation.

Diagnosis, Differential↗