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Shinjuku, Japan

Kato K.,Kato Ladies Clinic
Reproductive Medicine and Biology | Year: 2016

As survival rates and the life expectancy of those with malignancy have increased, more women in their reproductive years are referred for fertility preservation. Chemotherapy and radiotherapy can severely affect ovarian function, and the effect is irreversible. Therefore, it is optimal to attempt fertility preservation before chemotherapy and radiotherapy are initiated. Oocyte and embryo cryopreservation is the most common option for fertility preservation in women. Several reports have proven that embryo and oocyte cryopreservation can achieve a successful pregnancy. This review discusses the impact of chemotherapy and radiotherapy on ovarian function, and the importance of oocyte and embryo cryopreservation for fertility preservation. In addition, the current status of pregnancy outcomes and potential for cryopreserved oocytes to result in live births in cancer patients was reviewed. This may provide useful information for decision-making in cancer patients regarding oocyte and embryo cryopreservation and fertility preservation. © 2016 Japan Society for Reproductive Medicine Source


Sakata T.,University of Tokyo | Saito A.,University of Tokyo | Mizuno J.,Kato Ladies Clinic | Sugimoto H.,University of Tokyo | And 3 more authors.
Analytical Chemistry | Year: 2013

In this study, we have proposed and demonstrated experimentally a novel monitoring device of single mouse embryo activity after in vitro fertilization (IVF) using a semiconductor-based field effect transistor (FET). The FET biosensor realized to detect it noninvasively, quantitatively, and continuously by change of hydrogen ions with positive charges, which were induced by dissolved carbon dioxide due to cellular respiration activity during cleavage. The electrical signal of FET biosensor should become an effective indication to evaluate objectively single embryo activity as its morphology is observed subjectively after IVF. The platform based on the FET biosensor will contribute to promote elective single embryo transfer (eSET) in human assisted reproductive technology (ART). © 2013 American Chemical Society. Source


Osada H.,Nihon University | Kakinuma T.,Nihon University | Nagaishi M.,Nihon University | Kato K.,Kato Ladies Clinic | Kato O.,Kato Ladies Clinic
Reproductive BioMedicine Online | Year: 2011

The treatment for severe adenomyosis has usually been hysterectomy, because there is no line of demarcation between diseased and normal tissue. Yet many such women wish to retain their uterus and some even wish to bear children. This report evaluates the efficacy of a new method of adenomyomectomy, where adenomyotic tissues are radically excised and the uterine wall is reconstructed by a triple-flap method, without overlapping suture lines, to prevent uterine rupture in subsequent pregnancies. This is a prospective case series followed for 10 years from June 1998 to August 2008 of 104 women with severe adenomyosis verified histologically and with magnetic resonance imaging. There was a dramatic reduction in both dysmenorrhoea and hypermenorrhoea and all patients returned to having normal menstrual cycles. Of 26 women who wished to conceive, 16 became pregnant, 14 (53.8%) went to term and delivered a healthy baby and there were no cases of uterine rupture. Adenomyosis symptoms recurred in only four out of 104 cases. The procedure thus resulted in a dramatic reduction in symptoms and allowed over half of women who wished to conceive to go to term without uterine rupture. The usual treatment for severe adenomyosis has usually been hysterectomy, because there is no line of demarcation between diseased and normal tissue. Yet many such women wish to retain their uterus and some even wish to bear children. This report evaluates the efficacy of a new method of adenomyomectomy, where adenomyotic tissues are radically excised and the uterine wall is reconstructed by a triple-flap method without overlapping suture lines to prevent uterine rupture in subsequent pregnancies. This is a prospective case series followed for 10 years from June 1998 to August 2008 of 104 women with severe adenomyosis verified histologically and with magnetic resonance imaging. Radical excision of affected tissues, reconstruction of the endometrial cavity and reconstruction of the uterine wall in multiple overlapping layers was performed. The changes in symptoms for dysmenorrhoea and hypermenorrhoea were evaluated using a modified visual analogue scale. Post-operative pregnancy and delivery rate was calculated among those women who desired to conceive. There was a dramatic reduction in both dysmenorrhoea and hypermenorrhoea symptoms and all patients returned to having normal menstrual cycles. Of 26 women who wished to conceive, 16 became pregnant, 14 (53.8%) went to term and delivered a healthy baby and there were no cases of uterine rupture. Adenomyosis symptoms recurred in only four out of 104 cases. The procedure resulted in a dramatic reduction in both dysmenorrhoea and hypermenorrhoea post-surgically and allowed over half of women who wished to conceive to go to term without uterine rupture. © 2010, Reproductive Healthcare Ltd. Published by Elsevier Ltd. All rights reserved. Source


Kato K.,Kato Ladies Clinic | Takehara Y.,Kato Ladies Clinic | Segawa T.,YuMe | Kawachiya S.,Kato Ladies Clinic | And 4 more authors.
Reproductive Biology and Endocrinology | Year: 2012

Background: The two main complications associated with the use of assisted reproduction techniques, ovarian hyperstimulation syndrome and multiple pregnancies, could be eliminated by milder ovarian stimulation protocols and the increased use of a single embryo transfer (SET) policy. A retrospective, cohort study was performed in private infertility centre to evaluate the embryological and clinical results of a large exclusively SET program according to patient age (lower or equal 29, 30-34, 35-39, 40-44 and equal or higher 45 years).Materials: A total of 7,244 infertile patients have undergone 20,244 cycles with a clomiphene-based minimal stimulation or natural cycle IVF protocol during 2008. Following oocyte retrieval, fertilization and embryo culture a total of 10,401 fresh or frozen single embryo transfer procedures were performed involving cleavage-stage embryos or blastocysts.Results: Successful oocyte retrieval rate (78.0 %) showed no age-dependent decrease until 45 years. Fertilization (80.3 %) and cleavage (91.1 %) rates were not significantly different between age groups. Blastocyst formation (70.1 % to 22.8 %) and overall live birth rates (35.9 % to 2 %) showed an age-dependent decrease. Frozen-thawed blastocyst transfer cycles gave the highest chance of live birth per embryo transfer (41.3 % to 6.1 %).Conclusions: High fertilization and cleavage rates were obtained regardless of age whereas blastocyst formation and live birth rates showed an age-dependent decrease. An elective single embryo transfer program based on a minimal ovarian stimulation protocol yields acceptable live birth rates per embryo transfer in infertile patients up until their mid-forties. However in very advanced age patients (equal or higher 45 years old) success rates fall below 1 © 2012 Kato et al; licensee BioMed Central Ltd. Source


Kawachiya S.,Kato Ladies Clinic | Bodri D.,Clinica EUGIN | Shimada N.,YuMe | Kato K.,Kato Ladies Clinic | And 2 more authors.
Fertility and Sterility | Year: 2011

In a 7-year (2002-2008) retrospective study of a large IVF program based on minimal ovarian stimulation and single ET (47,841 single ETs), monozygotic twinning occurred in 1.01% of 14,956 clinical pregnancies. Blastocyst culture was associated with a significantly increased monozygotic twinning risk (adjusted odds ratio, 2.04; 95% confidence interval, 1.29-4.48), whereas embryo freezing, type of stimulation protocol used, intracytoplasmic sperm injection fertilization, or zona removal did not influence its incidence. © 2011 by American Society for Reproductive Medicine. Source

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