Hypophosphatasia: molecular testing of 19 prenatal cases and discussion about genetic counseling

OBJECTIVE: We studied hypophosphatasia (HP) mutations in 19 cases prenatally detected by ultrasonography without familial history of HP. We correlated the mutations with the reported ultrasound signs, and discussed genetic counseling with regard to the particular dominantly inherited prenatal benign form of HP. METHOD: The coding sequence of the tissue nonspecific alkaline phosphatase (TNSALP) gene was analyzed by DNA sequencing, and 3D modeling was used to locate the mutated amino acids with regard to the functional domains of TNSALP. RESULTS: Although reported ultrasound signs were heterogeneous, two mutated alleles were found in 18 of the 19 cases studied, indicating recessive transmission of the disease. Functional domains of TNSALP were affected by 74% of missense mutations. In all the cases, including one with only a heterozygous mutation, molecular, biological, and familial data do not corroborate the hypothesis of prenatal benign HP. The mutation c.1133A>T observed in the prenatal benign form of HP and common in USA was not found in this series. CONCLUSION: The results point out the prenatally detectable allelic heterogeneity of HP. The nature of the detected mutations and the evidence of recessive inheritance do not support these cases being affected with prenatal benign HP.     

Intraperitoneal hyperthermic chemotherapy using carboplatin: a phase I analysis in ovarian carcinoma

OBJECTIVE: Cyclic platinum-based intraperitoneal chemotherapy has proven to be effective after optimal surgical cytoreduction in ovarian carcinoma. Hyperthermia is directly cytotoxic and enhances chemotherapy tumoricidal effects. This study was designed to determine the maximum tolerated dose (MTD) of carboplatin used intraoperatively as intraperitoneal hyperthermic chemotherapy (IPHC), the effect on postoperative systemic chemotherapy administration, and the potential for repeat IPHC at second look surgery. METHODS: Using the ThermoChem HT System, escalating doses of carboplatin (400, 600, 800, 1000, and 1200 mg/m(2)) were administered intraoperatively as IPHC with a perfusion time of 90 min. A subgroup of eight patients that received initial IPHC and subsequent systemic chemotherapy underwent second look reassessment surgery with IPHC. RESULTS: The first 4 dose levels were well tolerated without dose-defining toxicity. The initial two patients treated at 1200 mg/m(2) developed grade 4 myelosuppression thus defining the MTD at 1000 mg/m(2). Newly diagnosed ovarian cancer patients receiving the initial IPHC at the MTD defined above completed standard systemic chemotherapy with six courses of systemic chemotherapy. Eight patients having initial IPHC and systemic chemotherapy subsequently had repeat IPHC performed at second look laparotomy without grade 3 or 4 toxicities. Four patients were found to have extensive adhesions at the time of second look reassessment surgery yet completed IPHC. CONCLUSIONS: The MTD for intraperitoneal carboplatin administered as IPHC was established at 1000 mg/m(2). IPHC at the initial cytoreductive procedure did not preclude subsequent systemic chemotherapy. In addition, repetitive IPHC was feasible at second look reassessment surgery.     

How important is consent in maternal serum screening for Down syndrome in France? Information and consent evaluation in maternal serum screening for Down syndrome: a French study

OBJECTIVES: To evaluate the level of information and informed consent for maternal serum screening (MSS) for Down syndrome (DS) in the second trimester of pregnancy and analyse the exercise of autonomy towards the test by the women concerned. METHODS: We studied the population of pregnant women attending obstetric consultations in two French hospitals over a 3-month period. The women were assigned to three groups according to MSS results for DS: women at high risk of having a child with DS (group 1), women at low risk (group 2) and women who did not undergo the test (group 3). A questionnaire was completed before the medical consultation, to assess the quality of consent before amniocentesis for the group at high risk and before the second-trimester ultrasound scan for the other two groups. RESULTS: We analysed 305 questionnaires for 89, 137 and 79 women belonging to groups 1, 2 and 3 respectively. In total, 123 women (40.3% [IC 95%, 35-46%]) were considered to be well informed; 33 (10%, [IC 95%, 8-12%]) had a high level of knowledge, but made choices not consistent with their stated attitude, and 149 (49.7% [IC 95%, 45-56%]) were considered uninformed. Logistic regression analysis showed that maternal consent depended on three independent components: The score attributed to the doctor for information about MSS (t = 4.216, p < 0.001).Whether the patient belonged to group 1 (t = -2.631, p < 0.009).Educational level (< high-school diploma, high-school diploma or at least two years of higher education after high school) (t = 2.324, p < 0.02). The rate of consent increased with educational level and was highest for the women in group 1 and for those whose doctor had a high information score. CONCLUSIONS: Our findings clearly show that women are provided with insufficient information concerning MSS screening for DS in the second trimester of pregnancy for real and valid consent to be obtained.