Biomedical subjects

C Peyret

Publications and source records attributed to C Peyret.

32 records · Page 2Linked to original sources

PubMed1991

[Adoptive immunotherapy and metastasized cancer of the kidney. Regulator effects of interleukin-4 on tumor infiltrating lymphocytes (TIL)].

Adoptive immunotherapy is a new therapeutic approach of the treatment of advanced renal cell cancer. Experimental studies have shown that the cells with the highest cytolytic activity are tumor infiltrating lymphocytes (TIL). The effects of interleukin-4 (IL-4) on the expansion, proliferation, phenotype and antitumor activity of TIL were studied. Cultures were obtained from three primary renal tumors and one group of tumor invaded, regional lymph nodes. IL-4 induced a significant increase in lymphocytes expansion and proliferation, but the response was dependent of the concurrent dose of IL-2 in culture. TIL grown in the presence of IL-4 significantly reduced the level of non specific, non MHC restricted antitumor activity while exhibiting no effect on the level of autologous killing. The effects of irradiated autologous tumor stimulation on TIL cultures were also evaluated. Addition of autologous tumor increased expansion and proliferation of all cultures and significantly enhanced levels of autologous killing. IL-4 and autologous tumor stimulation are effective growth factors when used in combination with a lose dose IL-2 regimen and may be of significant benefit in the expansion of TIL for clinical trials.

Adenocarcinoma↗

PubMed1991

[Varicocele in children and adolescents. Review of a series of 58 cases].

5 to 25% of male adolescents present with a varicocele; only those cases inducing serious discomfort or affecting the development of the testis require surgical treatment. Nevertheless, the results of surgery are disappointing, with a high recurrence rate. Based on a better knowledge of testicular venous drainage, it appears that conventional high ligation of the spermatic vein (s) might not be sufficient to cure varicocele. Fifty-eight patients were operated upon using four different procedures. Only complete, proximal ligation of all of the visibly dilated veins seems to prevent recurrences with a follow-up of at least one year. However, out of eleven cases treated with this original procedure, one patient, already operated upon twice without success, developed secondary atrophy.

Adolescent↗

PubMed1991

[Treatment of calculi of the lumbar ureter. Apropos of a series of 118 patients].

118 patients suffering from a calculus in the lumbar ureter were treated from January, 1987 to January, 1990. The treatment of 91 patients combined an initial internal ureteral drainage, followed by extracorporeal lithotrity (ECL): 40 calculi were driven back into the kidney and 51 were treated within the ureter. 69 patients (76%) no longer have any calculus; 17 (19%) retain residual fragments smaller than or equal to 3 mm in the lower calyces. We therefore count 5 failures, including 3 in which a second-intention surgical ureterotomy was performed. The ascent of the probe failed in 9 cases at the beginning of the series (6 ureterotomies and 3 percutaneous nephrostomies + ECL). 11 patients were treated with probeless in situ ECL. The others were treated with ureteroscopy (4), percutaneous nephrostomy + ECL (1) and nephrectomy (2). There is not one single treatment for the calculi of the lumbar ureter, and they require associating several therapeutic procedures.

Drainage↗

PubMed1991

[Low pressure bladder replacement after total cysto-prostatectomy. Apropos of a series of 40 patients].

The results of 40 consecutive patients who underwent bladder replacement following cystoprostatectomy for invasive bladder cancer are reported. A 30 cm detubularized ileal segment was used to make the neobladder. Mean follow-up was 19 months (over 2 years in 17 patients). All patients achieved diurnal continence. Nocturnal continence was obtained in 70.5% of patients: 41% had no leakage and nocturia less than 2, while 29.5% had some occasional leakage. Urodynamic evaluation showed the average peak flow to be at 18.3 ml/s and an average neobladder capacity of 410 ml. Six patients had spontaneous contractions of the enteric bladder of greater than 40 cm H20, always associated with elevated urethral pressure. Post-void residue was smaller than 100 cc in all cases. This procedure is simple to do, and led to an excellent diurnal continence, although it cannot assure nocturnal continence in every single patient.

Aged↗

PubMed1991

[A new therapeutic concept in the treatment of metastatic cancers of the kidney: the TIL (tumor infiltrating lymphocytes)].

The metastases of cancers of the kidneys raise difficult problems for treatment. In fact, the classical treatments combining surgery, radiation therapy, chemotherapy and hormono therapy are hardly effective to treat this condition. This explains the interest arising from the new therapeutic approach of immunotherapy, which is just beginning and offers appealing prospects. Experimental studies have shown that the cells with the highest cytolytic activity are tumor-infiltrating lymphocytes (TIL). The TIL are obtained by cultivating a mixed cell suspension--tumor cells/lymphocytes-infiltrating the tumor. After a three-weeks culture with Interleukin 2, the tumoral cells have been completely destroyed, and only a pure population of activated lymphocytes remains, which can be injected back to the patient. The first clinical trials with these activated lymphocytes have yielded encouraging results. Efforts are currently made to improve the therapeutic efficacy of this approach.

Adenocarcinoma↗

PubMed1990

Virus-neutralizing monoclonal antibody to a conserved epitope on the duck hepatitis B virus pre-S protein.

In this study we used duck hepatitis B virus (DHBV)-infected Pekin ducks and heron hepatitis B virus (HHBV)-infected heron tissue to search for epitopes responsible for virus neutralization on pre-S proteins. Monoclonal antibodies were produced by immunizing mice with purified DHBV particles. Of 10 anti-DHBV specific hybridomas obtained, 1 was selected for this study. This monoclonal antibody recognized in both DHBV-infected livers and viremic sera a major (36-kilodalton) protein and several minor pre-S proteins in all seven virus strains used. In contrast, pre-S proteins of HHBV-infected tissue or viremic sera did not react. Thus, the monoclonal antibody recognizes a highly conserved DHBV pre-S epitope. For mapping of the epitope, polypeptides from different regions of the DHBV pre-S/S gene were expressed in Escherichia coli and used as the substrate for immunoblotting. The epitope was delimited to a sequence of approximately 23 amino acids within the pre-S region, which is highly conserved in four cloned DHBV isolates and coincides with the main antigenic domain as predicted by computer algorithms. In in vitro neutralization assays performed with primary duck hepatocyte cultures, the antibody reduced DHBV infectivity by approximately 75%. These data demonstrate a conserved epitope of the DHBV pre-S protein which is located on the surface of the viral envelope and is recognized by virus-neutralizing antibodies.

Amino Acid Sequence↗

PubMed1990

[Varicocele in childhood and adolescence. Evaluation apropos of a series of 58 cases].

5 to 25% of the male adolescents present with a varicocele; only those cases inducing serious discomfort or affecting the development of the testis require surgical treatment. Nevertheless the results of surgery are disappointing with a high recurrence rate. Based on a better knowledge of the testicular venous drainage, it appears that the conventional high ligation of the spermatic vein(s) might not be sufficient to cure the varicocele, fifty-eight patients were operated upon using four different procedures. Only a complete and proximal ligation of all of the visibly dilated veins seems to prevent recurrences with a follow-up of at least one year. However, out of eleven cases treated with this original procedure, one patient, already operated upon twice without success, developed secondary atrophy.

Adolescent↗

PubMed1988

Prostate-specific antigen in prostatic cancer.

In an attempt to establish the value of prostate-specific antigen (PSA) in prostatic cancer, serum PSA measurements were performed in 600 patients, including 75 previously untreated prostatic cancer patients. The mean PSA levels in the benign prostatic hypertrophy (BPH) and cancer groups were highly significantly different, but less difference was found between BPH and localized prostatic cancer. A PSA level above 50 ng/ml was never recorded for BPH, but lower levels can be due to either prostatic cancer or to BPH. Our data suggest that PSA is not a specific marker of prostatic cancer but increased serum PSA levels must draw the physician's attention to the possible presence of prostatic cancer.

Antigens, Neoplasm↗

PubMed1988

[Prostate-specific antigen in prostatic pathology].

UNLABELLED: Prostate-specific antigen (PSA), like prostate acid phosphatase (PAP), are prostate tissue markers that are useful in prostate disorders. Increased PSA levels are often seen in carcinomas of the prostate, but have also been reported in benign inflammatory disorders of the prostate. We therefore studied PSA levels in 600 patients aged 22 to 89 years to evaluate the usefulness of this marker in prostate disorders. The 600 patients were divided into four groups: 120 normal subjects, 180 patients with carcinoma of organs other than the prostate, 75 patients with carcinoma of the prostate, and 225 patients with benign hypertrophy of the prostate. RESULTS: a significant difference in PSA levels was found between carcinomas and adenomas of the prostate, as well as between stage A carcinomas and adenomas of the prostate. Conversely, non significant difference was evidenced between stage A carcinomas and benign prostatic hypertrophy with inflammation. Rather than a specific marker for cancer, PSA indicates the presence of active prostatic disease, other investigations being necessary to determine whether this disease is malignant. PSA remains extremely useful for monitoring prostate carcinoma patients, especially following radical prostatectomy.

Adult↗

PubMed1988

[Continent replacement enterocystoplasty using a low-pressure detubularized ileal pouch after radical prostatocystectomy].

Tubular ileal-ileo-caecal or colonic replacement enterocystoplasties induce nocturnal incontinence in more than 70% of cases, partly due to the presence of peristaltic waves responsible for pressures greater than 40 cm of water for low filling volumes. The use of debutularised intestinal grafts considerably attenuates these pressure waves, ensuring excellent diurnal continence and a dramatic reduction in nocturnal incontinence together with protection of the upper urinary tract. The detubularised ileal bladder combines the reliability of all low pressure reservoirs with a simple technique: a 30 cm ileal segment is isolated then opened 2 cm from its anti-mesenteric border. The two limbs of the loop are sutured to each other. The ureters are reimplanted at the summit of each limb according to the mucosal groove procedure and the summit of the pouch is anastomosed to the urethra. This procedure has been used in 10 patients following radical cystectomy for cancer. Seven of these patients underwent clinical, radiological and urodynamic examination 5 months after the operation: all 7 patients were continent during the day. Nocturnal continence was obtained at the cost of getting up one or twice during the night, but incontinence persisted in the other 3 patients. Cystometry did not reveal any pressure waves greater than 25 cm of water for a volume of 500 ml. The detubularised ileal bladder is simple to perform and constitutes a reasonable alternative to traditional tubular enterocystoplasties.(ABSTRACT TRUNCATED AT 250 WORDS)

Aged↗

PubMed1987