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C Raffoux

Publications and source records attributed to C Raffoux.

At least 55 records · Page 3Linked to original sources
PubMed1993

Class I and II HLA typing after a 10 Gy-4 hour therapeutic total body irradiation.

Class I and II HLA typing was investigated before and at various intervals after a 10 Gy total body irradiation delivered over 4 h, prior to allogeneic bone marrow graft for various hematological malignancies, in 14 patients. A reliable class I HLA typing appeared to be possible in almost all cases 6-8 hours after the start of irradiation but was only possible in 5 patients after 24 h. Preliminary results with class II antigens might suggest a more marked "fragility" of this antigen class after irradiation. These results encourage the drawing of blood samples for HLA grouping as soon as possible after accidental whole-body irradiation.

Accidents↗
PubMed1992

[Kidney transplantation in hyperimmunized patients ignoring the cross-match performed with historic sera].

To ignore the positivity of renal pretransplantation cross-match performed with peak sera remains a controversial practice. The present study concerns 11 renal transplantations after positive cross-match with peak sera and negative cross-match with current sera. The clinical results of these transplantations lead to the assumption that peak sera contained HLA antibodies not specific to the graft and non HLA antibodies responsible for the positivity of the cross-match.

Antibody Specificity↗
PubMed1992

Multifactorial analysis of the outcome of 6430 cadaver kidney grafts.

A total of 6430 cadaver kidney grafts performed within the network of France-Transplant between 1 January 1978 and 1 January 1989 were analyzed. Each case was examined comprehensively in regard to 12 variables. A multifactorial analysis (Cox regression) was used to determine the degree of association between each covariate and the outcome of the graft. The results were evaluated by calculating relative risks of graft failure for each variable. A total of seven covariates appeared to influence graft survival significantly: the period of transplantation (P = 10(-8)), retransplantations (P = 0.003), age and sex of the donor (P = 0.003 and 0.009 respectively), duration of pretransplant dialysis (P = 0.03), pretransplant sensitization to HLA antigens (P = 0.05), and matching for HLA-A, -B, and -DR loci (P = 0.03). This last parameter has previously been reported as influencing the outcome of the graft in seven out of eight international studies carried out using similar methodology.

Adolescent↗
PubMed1991

Bone marrow transplantation using voluntary donors. Role of European Secretariat.

Bone marrow transplantation using unrelated donors is one technique used for patients who have no HLA identical donor. The French Registry "France Greffe de Moelle" (F.G.M.), with 57.866 volunteer donors has allowed since its creation in 1987 the treatment of 143 French patients (December 1990). For the remaining 20 % patients who have no donor on F.G.M., the request are sent to other European registries. In order to improve the management of these request, an European Secretariat: European Donor Secretariat (E.D.S.) has been created and set up in Paris. It manages all European requests coming from European registries. This organization permits to reduce the waiting time of the patients and therefore, participates in the improvement of the clinical results.

Bone Marrow Transplantation↗
PubMed1990

Evaluation of HLA-class II identity between unrelated individuals by serological typing, DNA-RFLP method, and mixed lymphocyte reaction.

Seven groups, each consisting of two to nine unrelated HLA-A, -B, and -DR serologically identical individuals, were analyzed by DNA-restriction fragment length polymorphism (RFLP) and mixed lymphocyte reactions (MLR) in order to evaluate HLA-class II identity between unrelated individuals and to assess the importance of HLA-class II incompatibilities detected by DNA-RFLP in the allogeneic reactions. It is clear that DNA-RFLP represents a powerful typing method for HLA-DR, -DQ, and -DP since the combinations of the RFLP band patterns define all the serological specificities and most of the cellular specificities to give a highly accurate typing. This report shows that an HLA-DP incompatibility induces proliferation in primary mixed lymphocyte culture (MLC) between unrelated HLA-A, -B, -DR, -DQ, and -DW identical individuals, which may suggest the importance of this molecule as a transplantation antigen, especially for unrelated bone marrow transplantations. Still, an isolated HLA-DPw4/HLA-DP a disparity did not induce any proliferation in MLC. Moreover, our results show that DQw7 (w3)/DQw8 (w3) disparity associated with HLA-DR4 represents a nonfunctional incompatibility in MLR. The HLA-Dw subtypes of HLA-DR specificities can induce a high proliferative response in MLC. The HLA-Dw subtypes of HLA-DR specificities can induce a high proliferative response in MLC. Finally, DNA-RFLP typing represents a reliable method for the selection of histocompatible donor-recipient pairs and could potentially reduce many logistic problems and delays in live-donor transplantation, especially for unrelated bone marrow transplantation.

Base Sequence↗
PubMed1990

HLA-DR, DQ, and/or DP genotypic mismatches between recipient-donor pairs in unrelated bone marrow transplantation and transplant clinical outcome.

Sixteen recipient-donor pairs who underwent unrelated BMT were analyzed for their HLA-class II identity by DNA-RFLP, in order to evaluate the importance of the genotypic HLA-DR, DQ, DP identity in the clinical outcome of unrelated bone marrow transplantation. From our study, a clear correlation between the HLA-DR, DQ, and DP genetic identity and acute GVHD (aGVHD) is not obvious since the number of studied cases is still limited. Nevertheless, it seems that the genetic identity influence the clinical outcome and patient survival. Six patients out of the ten who experienced severe aGVHD (greater than grade II) differed from their respective donors by HLA-DP mismatch in the GVH direction. Two patients rejected their grafts, and both presented HLA-DP incompatibilities in both GVH and HVG directions. Hence, HLA-DP may function as a transplantation antigen like the other HLA-class II molecules (DR, DQ) in unrelated BMT. Accordingly, we propose considering it in the pretransplantation histocompatibility testing. Nevertheless, further studies with larger numbers of cases should be done in order to confirm the role of HLA-DP. No correlation was observed between the mixed lymphocyte reaction (MLR) reactivity and the incidence of aGVHD. Accordingly, MLR response seems to be an incomplete indicator of GVHD, and a functional test is still to be found.

Bone Marrow Transplantation↗
PubMed1990

Epitope mapping of an HLA-B27 monoclonal antibody that also reacts with a 35-kD bacterial outer-membrane protein.

Ye-3 is an HLA-B27-specific murine monoclonal antibody recognizing the heat-modifiable protein of Enterobacteriaceae. Here we used recombinant hybrid molecules between the HLA-B7 and HLA-B27 antigens to delineate the epitope recognized by Ye-3. Results of these experiments indicated that the segment of HLA-B*2705 spanning residues 77-81 was critical to the reactive epitope. It is known to be a major serological and functional recognition site of HLA-B*2705 and our data give support for its involvement also in the serological cross-reactivity with bacterial antigens.

Alleles↗
PubMed1990

HLA-DP genotyping in HLA-A,B, and DR identical intrafamilial bone marrow transplantation.

In a study carried out for patients receiving intrafamilial HLA-A,B,DR identical, MLC negative bone marrow transplants, RFLP profiles of HLA-class II for 27 donor recipient pairs were analyzed. Twenty-four pairs were found HLA-class II identical while three pairs were HLA-DP incompatible. The patients of these three pairs did not reveal any acute GVHD greater than or equal to grade II. The seven cases of acute GVHD greater than or equal to grade II found in our panel were HLA-DR, DQ, and DP compatible. Thus, in practical terms pretransplantation HLA-DP typing does not seem necessary for intrafamilial HLA-identical, MLC negative BMT. On the other hand, this work confirmed that it is possible to type for HLA-DP using molecular biological techniques, and this in itself may have some important implications for unrelated BMT.

Adolescent↗
PubMed1990

Matched unrelated bone marrow transplants. Results from the French group (GEGMO).

From a bank of 50,000 HLA typed French bone marrow donors, 125 transplants have been performed since 1986, with HLA AB and DR--identical MLC--negative donors. The median age was 25 years and the diagnosis was CGL in 59 cases, ALL in 22 cases, AML in 17 cases, SAA in 7 cases, inborn errors in 7 cases and others in 13 cases. Most of the patients received a standard conditioning regimen according to their diagnosis. The prophylaxis of GVHD was methotrexate and cyclosporine A in 77 cases; in addition to this combination 44 patients received an anti-IL2 receptor monoclonal antibody from day +1 to day +28. There was no difference between the two groups as regards the incidence and severity of GVH or survival. The actuarial survival was 36% with a median follow up of 300 days. Unlike matched sibling grafts, the usual prognostic factors such as stage of disease or age were not found to significantly modify the incidence of GVHD, which was 75%. The results of matched unrelated donor transplants are reasonably good, but must be improved by a better selection of donors and better prevention of GVHD.

Actuarial Analysis↗
PubMed1989

[Informational structure of the national registry of bone marrow donor volunteers].

Successful Bone Marrow Transplantations with unrelated donors can be performed providing that donor and recipient are totally HLA-A, B, DR identical. To find such a suitable donor it is necessary to type a large pool of volunteers for HLA in histocompatibility laboratories. We have built a network of 36 micro-computers AT 286 for updating local files and for translating data to the national file of donors maintained on a main computer (VAX 8250). The main computer communicates regularly using modems with local computers in order to update data and exchange information. After one year of functioning, users are well satisfied with the computers system which locates regularly potential donors for recipients waiting for a graft.

Bone Marrow Transplantation↗