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2.
J Pediatr Adolesc Gynecol ; 36(2): 140-147, 2023 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-36343859

RESUMEN

STUDY OBJECTIVE: Early diagnosis and treatment of endometriosis affecting adolescent women are important in preventing chronic pain. Our aim was to analyze the clinical characteristics and severity of symptoms in adolescent patients with endometriosis compared with older patients. METHODS: This single-center retrospective cohort study in a tertiary referral hospital analyzed women whose first consultation at the certified endometriosis center of Bern University Hospital between January 2017 and December 2020 resulted in the clinical diagnosis of endometriosis. Patients, divided into 2 groups by age, reported visual analog scale (VAS) scores for noncyclic pelvic pain, dysmenorrhea, dyschezia, dysuria, and dyspareunia. The symptom types and severity in the 2 groups were compared. The young patients with endometriosis were analyzed in greater detail, comparing VAS scores and types of endometriosis. RESULTS: From a total of 826 patients, 144 (17.4%) patients 24 years old or younger and 682 (82.6%) patients over 24 years old were compared. The younger patients reported significantly higher pain scores for dysmenorrhea (VAS 7.3 vs 6.6; P = .015), dyspareunia (VAS 4.6 vs 3.4; P = .001), and noncyclic pelvic pain (VAS 4.3 vs 3.7; P = .032) compared with the older patient collective. Similar results were found when excluding patients with hormonal treatment. CONCLUSION: Young patients with clinically diagnosed endometriosis have significantly higher dysmenorrhea and dyspareunia pain levels than older patients. By acknowledging and understanding this, early diagnosis and adequate treatment can be promoted. Dyspareunia in adolescents in particular merits clinical attention.


Asunto(s)
Dispareunia , Endometriosis , Adolescente , Humanos , Femenino , Adulto Joven , Adulto , Dismenorrea/tratamiento farmacológico , Endometriosis/tratamiento farmacológico , Estudios Retrospectivos , Dolor Pélvico
3.
Dig Dis Sci ; 68(4): 1525-1528, 2023 04.
Artículo en Inglés | MEDLINE | ID: mdl-36315333

RESUMEN

Germline DNA alterations affecting homologous recombination pathway genes have been associated with pancreatic cancer (PC) risk. BRCA2 is the most studied gene and affects the management of PC patients and their families. Even though recent reports have suggested a similar role of germline ATM pathogenic variants (PV) in familial PC, there is still a disagreement between experts on how it could affect patient management given the lack of proper PC risk estimates. We retrospectively analyzed the germline data of 257 PC patients among whom nearly 50% were sporadic cases. We showed similar frequencies of BRCA2 (4.9%) and ATM (4.4%) PV or likely pathogenic variants, which were not related to familial history. Based on our findings and that of the literature, we suggest including ATM gene among the panel of genes analyzed in PC patients pending the publication of prospective studies.


Asunto(s)
Predisposición Genética a la Enfermedad , Neoplasias Pancreáticas , Humanos , Estudios Retrospectivos , Estudios Prospectivos , Mutación de Línea Germinal , Neoplasias Pancreáticas/genética , Neoplasias Pancreáticas/patología
4.
Curr Oncol ; 27(4): e399-e407, 2020 08.
Artículo en Inglés | MEDLINE | ID: mdl-32905333

RESUMEN

Non-melanoma skin cancers are the most prevalent form of cancer, with cutaneous squamous cell carcinoma (cscc) being the 2nd most common type. Patients presenting with high-risk lesions associated with locally advanced or metastatic cscc face high rates of recurrence and mortality. Accurate staging and risk stratification for patients can be challenging because no system is universally accepted, and no Canadian guidelines currently exist. Patients with advanced cscc are often deemed ineligible for either or both of curative surgery and radiation therapy (rt) and, until recently, were limited to off-label systemic cisplatin-fluorouracil or cetuximab therapy, which offers modest clinical benefits and potentially severe toxicity. A new systemic therapy, cemiplimab, has been approved for the treatment of locally advanced and metastatic cscc. In the present review, we provide recommendations for patient classification and staging based on current guidelines, direction for determining patient eligibility for surgery and rt, and an overview of the available systemic treatment options for advanced cscc and of the benefits of a multidisciplinary approach to patient management.


Asunto(s)
Carcinoma de Células Escamosas/terapia , Neoplasias Cutáneas/terapia , Carcinoma de Células Escamosas/patología , Humanos , Metástasis de la Neoplasia , Neoplasias Cutáneas/patología
5.
Oncoimmunology ; 8(8): 1615817, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31413923

RESUMEN

Pexastimogene devacirepvec (Pexa-Vec) is a vaccinia virus-based oncolytic immunotherapy designed to preferentially replicate in and destroy tumor cells while stimulating anti-tumor immunity by expressing GM-CSF. An earlier randomized Phase IIa trial in predominantly sorafenib-naïve hepatocellular carcinoma (HCC) demonstrated an overall survival (OS) benefit. This randomized, open-label Phase IIb trial investigated whether Pexa-Vec plus Best Supportive Care (BSC) improved OS over BSC alone in HCC patients who failed sorafenib therapy (TRAVERSE). 129 patients were randomly assigned 2:1 to Pexa-Vec plus BSC vs. BSC alone. Pexa-Vec was given as a single intravenous (IV) infusion followed by up to 5 IT injections. The primary endpoint was OS. Secondary endpoints included overall response rate (RR), time to progression (TTP) and safety. A high drop-out rate in the control arm (63%) confounded assessment of response-based endpoints. Median OS (ITT) for Pexa-Vec plus BSC vs. BSC alone was 4.2 and 4.4 months, respectively (HR, 1.19, 95% CI: 0.78-1.80; p = .428). There was no difference between the two treatment arms in RR or TTP. Pexa-Vec was generally well-tolerated. The most frequent Grade 3 included pyrexia (8%) and hypotension (8%). Induction of immune responses to vaccinia antigens and HCC associated antigens were observed. Despite a tolerable safety profile and induction of T cell responses, Pexa-Vec did not improve OS as second-line therapy after sorafenib failure. The true potential of oncolytic viruses may lie in the treatment of patients with earlier disease stages which should be addressed in future studies. ClinicalTrials.gov: NCT01387555.

6.
Ann Oncol ; 28(1): 169-174, 2017 01 01.
Artículo en Inglés | MEDLINE | ID: mdl-28177438

RESUMEN

Background: TG4023 is a modified vaccinia virus Ankara (MVA) containing the yeast-originated transgene FCU1, expressing cytosine deaminase and uracil phosphoribosyltransferase enzymes that transform the prodrug flucytosine (5-FC) into cytotoxic 5-fluorouracil (5-FU) and 5-fluorouridine-5'-monophosphate, respectively. This first-in-human study aimed to assess the maximum tolerated dose (MTD) of intratumoral (IT) TG4023 and the safety, feasibility, and proof-of-concept (PoC) of TG4023/5-FC combination to deliver high 5-FU concentrations in tumors. Patients and Methods: Cancer patients without further therapeutic option and with at least one injectable primary or metastatic liver tumor underwent on day 1 a percutaneous IT injection of TG4023 at doses of 107, 108, or 4.108 plaque forming units (p.f.u.) using ultrasound imaging guidance, after a dose-limiting toxicities (DLTs)-driven 3 + 3 dose-escalating design. On day 2, patients were given intravenous and/or oral 5-FC at a dose of 200 mg/kg/day for 14 days and were followed for safety through day 43. Tumor response was assessed at week 6, according to RECIST. Plasma and tumor 5-FU concentrations were measured to establish the PoC. Results: In total, 16 patients completed treatment with TG4023 and 5-FC. One DLT/7 patients (ALT/aspartate aminotransferase transient increase) was observed at 4 × 108 p.f.u.; MTD was therefore not reached. The most frequent adverse events were pyrexia, asthenia, vomiting, and decreased appetite. Eight of 16 patients had stable disease. Mean 5-FU concentrations in plasma were 1.9 ± 2.6 ng/ml and 56 ± 30 ng/g in tumors. Seroconversion for anti-FCU1 antibodies was found for one patient from each cohort (16%, overall). Conclusions: This phase I study demonstrated that IT injections of TG4023 were feasible and well tolerated; MTD was defined as 4 × 108 p.f.u. Therapeutic 5-FU concentrations in tumors established the virus-directed enzyme-prodrug therapy PoC. Clinicaltrials.gov Number: NCT00978107.


Asunto(s)
Citosina Desaminasa/genética , Flucitosina/uso terapéutico , Terapia Genética/métodos , Vectores Genéticos/administración & dosificación , Vectores Genéticos/genética , Neoplasias Hepáticas/terapia , Pentosiltransferasa/genética , Adulto , Anciano , Anciano de 80 o más Años , Terapia Combinada , Citosina Desaminasa/metabolismo , Femenino , Flucitosina/farmacocinética , Fluorouracilo/sangre , Fluorouracilo/farmacocinética , Humanos , Inyecciones Intralesiones , Neoplasias Hepáticas/tratamiento farmacológico , Neoplasias Hepáticas/genética , Masculino , Persona de Mediana Edad , Pentosiltransferasa/metabolismo , Prueba de Estudio Conceptual , Transgenes , Virus Vaccinia/genética
7.
Invest New Drugs ; 27(4): 379-86, 2009 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-18931824

RESUMEN

PURPOSE: TG4010 is a recombinant MVA vector expressing the tumor-associated antigen MUC1 and IL2. We explored the effect two schedules of TG4010 on PSA in men with PSA progression. PATIENTS AND METHODS: A randomized phase II trial was conducted in 40 patients with PSA progression. Patients had PSA doubling times less than 10 months, with no overt evidence of disease. Patients received either weekly subcutaneous injection (sc) of TG4010 10(8) pfu for 6 weeks, then one injection every 3 weeks or sc injection of TG4010 10(8) pfu every 3 weeks. RESULTS: The primary endpoint of a 50% decrease in PSA values from baseline was not observed. Nevertheless, 13 of 40 patients had a more than two fold improvement in PSA doubling time. Ten patients had their PSA stabilized for over 8 months. Therapy was well tolerated. CONCLUSIONS: Although the primary endpoint was not achieved, there is evidence of biologic activity of TG4010 in patients with PSA progression, further investigation in prostate cancer is warranted.


Asunto(s)
Vacunas contra el Cáncer/uso terapéutico , Glicoproteínas de Membrana/uso terapéutico , Antígeno Prostático Específico/efectos de los fármacos , Neoplasias de la Próstata/tratamiento farmacológico , Anciano , Vacunas contra el Cáncer/administración & dosificación , Vacunas contra el Cáncer/efectos adversos , Progresión de la Enfermedad , Esquema de Medicación , Humanos , Inmunoterapia/métodos , Inyecciones Subcutáneas , Interleucina-2/inmunología , Masculino , Glicoproteínas de Membrana/administración & dosificación , Glicoproteínas de Membrana/efectos adversos , Persona de Mediana Edad , Mucina-1/inmunología , Antígeno Prostático Específico/sangre , Neoplasias de la Próstata/inmunología , Factores de Tiempo , Resultado del Tratamiento
9.
Hepatogastroenterology ; 52(65): 1557-8, 2005.
Artículo en Inglés | MEDLINE | ID: mdl-16201118

RESUMEN

The onset of liver abscess due to Clostridium septicum -an anaerobic gram-positive bacillus- is a rare condition, generally arising in cancer patients. The radiological picture is that of gas-containing pyogenic abscess, that predominates within preexisting liver metastases. We report a case of a 50-year-old patient with metastatic colon cancer who was referred with multiple Clostridium septicum liver abscesses. The patient underwent parenteral antibiotherapy as well as transcutaneous drainage of the largest liver abscess. However the outcome was unfavorable in a clinical picture of liver failure that was likely due to disease progression rather than sepsis. Clostridium septicum liver abscess is a life-threatening condition that occurs in fragile patients, mostly with metastatic cancers. A review of the reported cases is presented and treatment options are discussed.


Asunto(s)
Absceso Hepático/microbiología , Neoplasias Hepáticas/microbiología , Sobreinfección/microbiología , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Infecciones por Clostridium/tratamiento farmacológico , Infecciones por Clostridium/epidemiología , Neoplasias del Colon/epidemiología , Neoplasias del Colon/patología , Comorbilidad , Progresión de la Enfermedad , Drenaje , Resultado Fatal , Femenino , Humanos , Absceso Hepático/diagnóstico por imagen , Absceso Hepático/terapia , Neoplasias Hepáticas/tratamiento farmacológico , Neoplasias Hepáticas/epidemiología , Neoplasias Hepáticas/secundario , Persona de Mediana Edad , Sobreinfección/terapia , Tomografía Computarizada por Rayos X
10.
Bull Cancer ; 88(6): 581-7, 2001 Jun.
Artículo en Francés | MEDLINE | ID: mdl-11459705

RESUMEN

The Li-Fraumeni syndrome (LFS) is an inherited form of cancer, affecting children and young adults, and characterized by a wide spectrum of tumors, including soft-tissue and bone sarcomas, brain tumours, adenocortical tumours and premenopausal breast cancers. In most of the families, LFS results from germline mutations of the tumor suppressor TP53 gene encoding a transcriptional factor able to regulate cell cycle and apoptosis when DNA damage occurs. Recently, germline mutations of hCHK2 encoding a kinase, regulating cell cycle via Cdc25C and TP53, were identified in affected families. The LFS working group recommendations are the following: (i) positive testing (screening for a germline TP53 mutation in a patient with a tumor) can be offered both to children and adults in the context of genetic counseling associated to psychological support, to confirm the diagnosis of LFS on a molecular basis. This will allow to offer to the patient a regular clinical review in order to avoid a delay to the diagnosis of another tumor; (ii) the 3 indications for positive testing are: a proband with a tumor belonging to the narrow LFS spectrum and developed before age 36 and, at least, first- or second-degree relative with a LFS spectrum tumor, before age 46, or a patient with multiple primary tumors, 2 of which belonging to the narrow LFS spectrum, the first being developed before 36 or a child with an adenocortical tumour; (iii) presymptomatic testing must be restricted to adults; (iv) the young age of onset of the LFS tumors the prognosis of some tumors, the impossibility to ensure an efficient early detection and the risk for mutation carriers to develop multiple primary tumors justify that prenatal diagnosis might be considered in affected families.


Asunto(s)
Genes p53/genética , Síndrome de Li-Fraumeni/genética , Proteínas Serina-Treonina Quinasas , Adulto , Factores de Edad , Quinasa de Punto de Control 2 , Niño , Femenino , Silenciador del Gen , Asesoramiento Genético , Predisposición Genética a la Enfermedad , Humanos , Síndrome de Li-Fraumeni/diagnóstico , Síndrome de Li-Fraumeni/terapia , Masculino , Mamografía , Mutación , Fosforilación , Guías de Práctica Clínica como Asunto , Proteínas Quinasas/genética
11.
Int J Cancer ; 96(4): 238-42, 2001 Aug 20.
Artículo en Inglés | MEDLINE | ID: mdl-11474498

RESUMEN

A woman with a family history of brain tumors in her daughter and sister presented with a breast cancer. She subsequently developed two metachronous primary tumors: a small-cell lung cancer and a colon carcinoma. These tumors arose within the internal mammary radiotherapy field and within the field irradiated for ovariolysis. The p53 gene was analyzed in whole blood lymphocytes using a functional assay developed in yeast Saccharomyces cerevisiae, which tests the transcriptional competence of p53. DNA from the colon cancer cells was analyzed by polymerase chain reaction and sequencing. The patient had a germline-inactivating p53 mutation, confirming the diagnosis of Li-Fraumeni syndrome (LFS). The colon tumor and the lung tumor both conserved the mutant p53 allele but had lost the wild-type allele. This observation and the experimental data suggest an abnormal sensitivity of LFS patients to radiogenic carcinogenesis. The indications and extent of radiotherapy in patients with a clinical or molecular diagnosis of LFS should be discussed individually and should take into account the risk of secondary neoplasms arising in the radiation fields.


Asunto(s)
Neoplasias de la Mama/patología , Neoplasias de la Mama/radioterapia , Carcinoma de Células Pequeñas/etiología , Carcinoma de Células Pequeñas/secundario , Neoplasias del Colon/etiología , Neoplasias del Colon/secundario , Síndrome de Li-Fraumeni/complicaciones , Síndrome de Li-Fraumeni/genética , Neoplasias Pulmonares/etiología , Neoplasias Pulmonares/secundario , Neoplasias Inducidas por Radiación , Adulto , Alelos , Secuencia de Aminoácidos , Secuencia de Bases , Análisis Mutacional de ADN , Exones , Salud de la Familia , Femenino , Genes p53/genética , Mutación de Línea Germinal , Humanos , Datos de Secuencia Molecular , Mutación , Radioterapia/efectos adversos , Homología de Secuencia de Aminoácido , Homología de Secuencia de Ácido Nucleico
13.
Hepatogastroenterology ; 47(35): 1450-3, 2000.
Artículo en Inglés | MEDLINE | ID: mdl-11100374

RESUMEN

BACKGROUND/AIMS: Although chemotherapy in advanced pancreatic cancer procures dismal results, both 5-fluorouracil and gemcitabine have shown a modest activity. We report a phase II study of gemcitabine combined with protracted 5-fluorouracil. METHODOLOGY: Gemcitabine was given at 1000 mg/m2/week intravenously, in combination with concomitant 5-fluorouracil 200 mg/m2/day as a protracted venous infusion, both 3 out of 4 weeks in patients with locally advanced or metastatic pancreatic adenocarcinoma. Twenty-nine patients were enrolled, among whom 27 were metastatic. Response rate, overall and progression-free survival were endpoints, as well as tolerance and clinical benefit. RESULTS: We observed 3 (10%) partial responses, and 12 (42%) stabilizations within which the median disease control was 5.6 months. The median progression-free and overall survivals were 2.8 and 4 months, respectively. A clinical benefit was observed in 39% of patients. Myelosuppression was the main toxicity, but no grade 4 was observed. Other toxicities were mild. CONCLUSIONS: This combination chemotherapy was well tolerated in advanced pancreatic cancer patients.


Asunto(s)
Adenocarcinoma/tratamiento farmacológico , Antimetabolitos Antineoplásicos/administración & dosificación , Protocolos de Quimioterapia Combinada Antineoplásica/administración & dosificación , Desoxicitidina/análogos & derivados , Fluorouracilo/administración & dosificación , Neoplasias Pancreáticas/tratamiento farmacológico , Adenocarcinoma/mortalidad , Adulto , Anciano , Antimetabolitos Antineoplásicos/efectos adversos , Desoxicitidina/administración & dosificación , Desoxicitidina/efectos adversos , Supervivencia sin Enfermedad , Fluorouracilo/efectos adversos , Humanos , Infusiones Intravenosas , Inyecciones Intravenosas , Persona de Mediana Edad , Neoplasias Pancreáticas/mortalidad , Resultado del Tratamiento , Gemcitabina
14.
Cancer Res ; 60(11): 2760-3, 2000 Jun 01.
Artículo en Inglés | MEDLINE | ID: mdl-10850409

RESUMEN

Large genomic deletions within the mismatch repair MLH1 and MSH2 genes have been identified in families with the hereditary nonpolyposis colorectal cancer (HNPCC) syndrome, and their detection represents a technical problem. To facilitate their detection, we developed a simple semiquantitative procedure based on the multiplex PCR of short fluorescent fragments. This method allowed us to confirm in HNPCC families three known deletions of MLH1 or MSH2 and to detect in 19 HNPCC families, in which analysis of mismatch repair genes using classical methods had revealed no alteration, a deletion of exon 5 and a duplication of MSH2 involving exons 9 and 10. The presence of such duplications, the frequency of which is probably underestimated, must be considered in HNPCC families in which conventional screening methods have failed to detect mutations.


Asunto(s)
Neoplasias Colorrectales Hereditarias sin Poliposis/genética , Reparación del ADN/genética , Proteínas de Unión al ADN , Eliminación de Gen , Duplicación de Gen , Proteínas de Neoplasias/genética , Proteínas Proto-Oncogénicas/genética , Proteínas Adaptadoras Transductoras de Señales , Disparidad de Par Base/genética , Proteínas Portadoras , Exones , Salud de la Familia , Humanos , Intrones , Modelos Genéticos , Homólogo 1 de la Proteína MutL , Proteína 2 Homóloga a MutS , Proteínas Nucleares , Reacción en Cadena de la Polimerasa/métodos
15.
Hum Mutat ; 14(3): 249-55, 1999.
Artículo en Inglés | MEDLINE | ID: mdl-10477433

RESUMEN

To extend earlier observations of germline E-cadherin mutations in kindreds with an inherited susceptibility to diffuse gastric cancer, we searched for germline E-cadherin mutations in five further families affected predominantly by diffuse gastric cancer and one family with a history of diffuse gastric cancer and early-onset breast cancer. Heterozygous inactivating mutations were found in the E-cadherin gene in each of these families. No mutation hotspots were identified. These results demonstrate that germline mutation of the E-cadherin gene is a common cause of hereditary diffuse gastric cancer and suggest a role for these mutations in the incidence of breast cancer.


Asunto(s)
Adenocarcinoma/genética , Neoplasias de la Mama/genética , Cadherinas/genética , Mutación de Línea Germinal , Neoplasias Gástricas/genética , Adulto , Anciano , Anciano de 80 o más Años , Análisis Mutacional de ADN , Femenino , Humanos , Leucocitos , Pérdida de Heterocigocidad , Masculino , Persona de Mediana Edad , Linaje , Reacción en Cadena de la Polimerasa , Polimorfismo Genético , Síndrome
16.
J Fr Ophtalmol ; 22(3): 364-70, 1999 Apr.
Artículo en Francés | MEDLINE | ID: mdl-10337595

RESUMEN

PURPOSE: Familial adenomatous polyposis (FAP) is an inherited autosomal dominant disorder with marked propensity for malignant transformation. The potential for congenital hypertrophy of retinal pigment epithelium (CHRPE) as a phenotypic marker for this disease is recognized. MATERIAL AND METHODS: We report our investigations in 11 families with familial adenomatous polyposis. CHRPE characteristics were described and the relations between genotype and phenotype and those between CHRPE and severity of FAP are discussed. DISCUSSION: All members of the family should undergo retinal examination at the earliest age possible. The results give an indication of the severity of the intestinal disease and allow an approximate localization of the mutation in the coding sequence, leading to a more rapid genetic analysis.


Asunto(s)
Poliposis Adenomatosa del Colon/genética , Epitelio Pigmentado Ocular/patología , Poliposis Adenomatosa del Colon/clasificación , Adolescente , Adulto , Niño , Preescolar , Análisis Mutacional de ADN , Femenino , Marcadores Genéticos , Genotipo , Humanos , Hipertrofia/congénito , Hipertrofia/genética , Masculino , Linaje , Fenotipo , Factores de Riesgo , Sensibilidad y Especificidad , Índice de Severidad de la Enfermedad
17.
Gynecol Oncol ; 70(3): 414-7, 1998 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-9790797

RESUMEN

Despite high response rates with platinum-based front-line chemotherapy, the prognosis for advanced ovarian carcinoma (AOC) is poor. Salvage chemotherapy for recurrent AOC was of little benefit before paclitaxel as single-agent therapy showed appreciable efficacy. Anthracyclines are effective, but are not often part of first-line therapy. In this pilot study, we investigated the feasibility of an anthracycline plus paclitaxel combination therapy for recurrent AOC. Twenty-four patients received 150 mg/m2 paclitaxel on day 1, with either 50 mg/m2 doxorubicin on day 1 or 75 mg/m2 epirubicin on day 1 every 3 weeks. A 27% overall response rate was obtained. Myelosuppression was the major toxicity, but was manageable. No myocardiac toxicity was observed. We conclude that paclitaxel-anthracyclines is a promising salvage combination therapy in AOC that should be investigated further.


Asunto(s)
Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Carcinoma/tratamiento farmacológico , Neoplasias Ováricas/tratamiento farmacológico , Adolescente , Adulto , Anciano , Antibióticos Antineoplásicos/administración & dosificación , Protocolos de Quimioterapia Combinada Antineoplásica/efectos adversos , Supervivencia sin Enfermedad , Esquema de Medicación , Femenino , Humanos , Persona de Mediana Edad , Paclitaxel/administración & dosificación , Proyectos Piloto , Compuestos de Platino/uso terapéutico , Recurrencia , Terapia Recuperativa , Resultado del Tratamiento
18.
Int J Cancer ; 75(3): 432-8, 1998 Jan 30.
Artículo en Inglés | MEDLINE | ID: mdl-9455805

RESUMEN

p53 mutations are found in about 70% of human cancers. In order to evaluate the role of these mutations in response to chemotherapeutic agents, it is important to distinguish between p53 response to DNA-damaging agents in normal and in tumour cells. Here, using normal human fibroblasts (NHFs), we show that cisplatin and UV radiation induce G2/M arrest which is temporally linked to p53-protein induction. To study the contribution of p53 to this G2/M arrest, we inhibited p53 induction in NHFs using p53 anti-sense oligonucleotides. Following exposure of NHFs to UV radiation, the inhibition of p53-protein induction leads to a greater accumulation of cells in the G2/M phase, but also to a decreased fraction of cells in the G1 phase. We propose that p53 does not induce G2/M arrest directly, and that the extent of this arrest may depend on the fraction of cells that do not stop at the G1 phase following exposure to DNA-damaging agents. Furthermore, inhibition of p53-protein induction leads to increased sensitivity of NHFs to UV radiation. These results suggest that inhibition of p53 protein enhances sensitivity to DNA-damaging agents in normal human cells.


Asunto(s)
Antineoplásicos/farmacología , Cisplatino/farmacología , Daño del ADN , Fase G2/fisiología , Regulación de la Expresión Génica/fisiología , Genes p53 , Mitosis/fisiología , Oligonucleótidos Antisentido/farmacología , Tolerancia a Radiación/fisiología , Secuencia de Bases , Células Cultivadas , ADN/efectos de los fármacos , ADN/metabolismo , ADN/efectos de la radiación , Ensayos de Selección de Medicamentos Antitumorales , Fibroblastos/efectos de los fármacos , Fibroblastos/metabolismo , Fibroblastos/efectos de la radiación , Fase G2/efectos de los fármacos , Fase G2/efectos de la radiación , Humanos , Mitosis/efectos de los fármacos , Mitosis/efectos de la radiación , Datos de Secuencia Molecular , Mutación , Proteína p53 Supresora de Tumor/biosíntesis , Rayos Ultravioleta/efectos adversos
19.
Bull Cancer ; 84(6): 603-8, 1997 Jun.
Artículo en Francés | MEDLINE | ID: mdl-9295863

RESUMEN

The purpose of our investigation was to evaluate the pharmacokinetic profile of doxorubicin administered by a new schedule. Nine non-pretreated young women with high risk breast cancer (mean age: 38, range: 29-45) entered this trial and received, cyclophosphamide (600 mg/m2) given as a 30-min infusion followed by doxorubicin (120 mg/m2) as a continuous infusion over 6 h. Chemotherapy was combined with hematopoietic factor support (G-CSF or GM-CSF). Blood was sampled over the 0-54 h period and 14 cycles were studied for pharmacokinetics. Doxorubicin as well as its major metabolite doxorubicinol were assayed in plasma specimen by high performance liquid chromatography. Mean doxorubicin plasma concentration peak was 42.6 ng/ml (standard deviation (SD): 13.3). The mean terminal half-lives were 32.6 h (SD: 22.0) and 39.2 h (SD: 21.6) for doxorubicin and doxorubicinol, respectively. Mean areas under the plasma concentration-time curve (AUC) were 413 ng/h-1 ml (SD: 103) and 1,707 ng/h-1 ml (SD: 815) for doxorubicin and doxorubicinol respectively. Consequently, the ratio of the AUC of doxorubicinol to that of doxorubicin was high (mean: 4.1 (SD: 1.6)) contrasting with previous studies reporting ratios less than 1 in patients with normal liver function. The systemic clearance of doxorubicin was 5.23 l/min/m2 (SD: 1.91). The inter- and intra-patient variability for AUC was low for both drugs. Hence the coefficients of variation were 24.6% for doxorubicin, 26.2% for doxorubicinol (inter-individual variation) and less than 10% for both compounds (intra-individual variation). In conclusion, the pharmacokinetic profile of doxorubicin (120 mg/m2) administered as a 6 h-continuous infusion is characterized by a greater exposure to doxorubicinol. This could be explained by a saturation in the biliary excretion process during the period following the end of the infusion.


Asunto(s)
Antibióticos Antineoplásicos/farmacocinética , Neoplasias de la Mama/tratamiento farmacológico , Doxorrubicina/análogos & derivados , Doxorrubicina/farmacocinética , Adulto , Antibióticos Antineoplásicos/uso terapéutico , Protocolos de Quimioterapia Combinada Antineoplásica/uso terapéutico , Neoplasias de la Mama/sangre , Ciclofosfamida/uso terapéutico , Doxorrubicina/uso terapéutico , Esquema de Medicación , Femenino , Factor Estimulante de Colonias de Granulocitos/uso terapéutico , Factor Estimulante de Colonias de Granulocitos y Macrófagos/uso terapéutico , Semivida , Humanos , Tasa de Depuración Metabólica , Persona de Mediana Edad , Resultado del Tratamiento
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