Estella Yee Lan Lau
University of Hong Kong
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Featured researches published by Estella Yee Lan Lau.
Human Reproduction | 2009
Emily Wing Sze So; Ernest Hung Yu Ng; Yu Yeuk Wong; Estella Yee Lan Lau; William S.B. Yeung; Pak Chung Ho
BACKGROUND Acupuncture has been used during IVF treatment as it may improve outcome, however, there are concerns about the true efficacy of this approach. This randomized double blind study aimed to compare real acupuncture with placebo acupuncture in patients undergoing IVF treatment. METHODS On the day of embryo transfer (ET), 370 patients were randomly allocated to either real or placebo acupuncture according to a computer-generated randomization list in sealed opaque envelopes. They received 25 min of real or placebo acupuncture before and after ET. The endometrial and subendometrial vascularity, serum cortisol concentration and the anxiety level were evaluated before and after real and placebo acupuncture. RESULTS The overall pregnancy rate was significantly higher in the placebo acupuncture group than that in the real acupuncture group (55.1 versus 43.8%, respectively, P = 0.038; Common odds ratio 1.578 95% confidence interval 1.047-2.378). No significant differences were found in rates of ongoing pregnancy and live birth between the two groups. Reduction of endometrial and subendometrial vascularity, serum cortisol concentration and the anxiety level were observed following both real and placebo acupuncture, although there were no significant differences in the changes in all these indices between the two groups. CONCLUSIONS Placebo acupuncture was associated with a significantly higher overall pregnancy rate when compared with real acupuncture. Placebo acupuncture may not be inert. Trial registered with HKClinicalTrials.com: number HKCTR-236.
PLOS ONE | 2013
Hang Wun Raymond Li; Vivian Chi Yan Lee; Estella Yee Lan Lau; William S.B. Yeung; Pak Chung Ho; Ernest Hung Yu Ng
Objective This retrospective study determined for the first time the role of baseline antral follicle count (AFC) and serum anti-Mullerian hormone (AMH) level in the first in-vitro fertilisation (IVF) cycle in predicting cumulative live birth from one stimulation cycle. Methods We studied 1,156 women (median age 35 years) undergoing the first IVF cycle. Baseline AFC and AMH level on the day before ovarian stimulation were analysed. The main outcome measure was cumulative live birth in the fresh plus all the frozen embryo transfers after the same stimulation cycle. Results Serum AMH was significantly correlated with AFC. Both AMH and AFC showed significant correlation with age and ovarian response in the stimulated cycle and total number of transferrable embryos. Baseline AFC and serum AMH were significantly higher in subjects attaining a live birth than those who did not in the fresh stimulated cycle, as well as those attaining cumulative live birth. There was a significant trend of higher cumulative live birth rate in women with higher AMH or AFC. However, logistic regression revealed that both AMH and AFC were not significant predictors of cumulative live birth after adjusting for age and number of embryos available for transfer. Considering only one single predictor, the areas under the ROC curves for AMH (0.646, 95% CI 0.616–0.675) and age (0.648, 95% CI 0.618–0.677) were slightly higher than that for AFC (0.617, 95% CI 0.587–0.647) in predicting cumulative live birth. However, a model combining AMH (with or without AFC) and age of the women only classified an addition of less than 2% of subjects correctly compared to the model with age alone. Conclusion Baseline AFC and serum AMH have only modest predictive performance on the occurrence of cumulative live birth, and may not give additional value on top of the womens age.
Journal of Assisted Reproduction and Genetics | 2003
Ernest Hung Yu Ng; Estella Yee Lan Lau; William S.B. Yeung; Pak Chung Ho
AbstractPurpose: This study examined oocyte and embryo quality in patients having excessive ovarian responses during assisted reproduction treatment. Methods: Two hundred and Seventy-eight women of age <40 years using a long protocol of pituitary downregulation in their first intracytoplasmic sperm injection cycle indicated for severe male factors were retrospectively evaluated. Those with serum estradiol concentration on the day of HCG <10,000, 10,000–20,000, and >20,000 pmol/L were classified into Group A, Group B, and Group C, respectively. Results: The percentage of metaphase II oocytes (85%), fertilization rate (60–66%), and distribution of blastomere number per embryo were similar among the three groups. The proportion of transferable embryos was not reduced in Group C when compared to those of Groups A and B. Conclusion: Excessive ovarian response does not compromise oocyte and embryo quality in humans. Freezing of all embryos is recommended in these patients in view of associated impaired endometrial receptivity.
Fertility and Sterility | 2010
Hang Wun Raymond Li; William S.B. Yeung; Estella Yee Lan Lau; Pak Chung Ho; Ernest Hung Yu Ng
OBJECTIVE To evaluate the role of serum antimullerian hormone (AMH) concentration in predicting live birth outcome in controlled ovarian stimulation and intrauterine insemination (IUI). DESIGN Retrospective analysis. SETTING Tertiary assisted reproduction unit. PATIENTS 243 patients undergoing IUI treatment. INTERVENTION(S) Archived early follicular phase serum samples taken at the start of the first treatment cycle before ovarian stimulation were retrieved from patients undergoing IUI treatment. MAIN OUTCOME MEASURE(S) First-cycle and cumulative live birth rates. RESULT(S) Patients attaining a successful live birth, either in the first cycle or cumulatively after three cycles, had significantly higher serum AMH concentrations than those failing treatment. Serum AMH concentration correlated positively with antral follicle count (AFC) and duration of stimulation and inversely with maternal age, serum FSH concentration, and total dose of gonadotropin used. After controlling for age, body mass index, AFC, and FSH, AMH remained the only significant predictor of cumulative live birth. The area under the receiver operating characteristic curve was 0.668 in predicting cumulative live birth. Serum AMH concentration was significantly higher in overresponders. CONCLUSION(S) Serum AMH concentration was significantly higher in subjects with a live birth from the first cycle or after three cycles of stimulated IUI treatment compared with those failing treatment. Serum AMH concentration has a modest predictive value on ovarian overresponse.
Journal of Assisted Reproduction and Genetics | 2003
J. Y. M. Tse; Vincent W.S. Liu; William S.B. Yeung; Estella Yee Lan Lau; Ernest Hung Yu Ng; Pak Chung Ho
AbstractPurpose: To investigate the relationship between CAG repeat length in the androgen receptor gene and impaired spermatogenesis in Hong Kong Chinese population. Methods: The CAG repeat region was amplified by polymerase chain reaction (PCR) in 85 nonobstructive azoospermic or severe oligozoospermic men, and 45 fertile males. The number of CAG repeat was analyzed by DNA sequencing. Serum FSH, LH, and testosterone levels were also determined in these men. Results: Among nonobstructive azoospermic males, three men (5.7%) possessed short CAG repeats (<16), and three (5.7%) other men possessed long CAG repeats (>30). Short CAG repeats (<16) were also found in two severe oligozoospermic males (6.3%). The incidence of infertile men with short or long CAG repeats is significantly higher in the azoospermic group (p = 0.03) but not in the severe oligozoospermic group (p = 0.17) when compared with the fertile controls. Conclusion: Our data suggest an association between CAG repeat lengths and impaired spermatogenesis in azoospermic males in our population.
Journal of Obstetrics and Gynaecology Research | 2001
Ernest Hung Yu Ng; Estella Yee Lan Lau; William S.B. Yeung; Pak Chung Ho
Objectives: To compare the pregnancy rates and multiple pregnancy rates of cycles initiated in 1998 and in 1999, during which 3 and 2 embryos were advised to be replaced, respectively.
PLOS ONE | 2014
Hang Wun Raymond Li; Vivian Chi Yan Lee; Estella Yee Lan Lau; William S.B. Yeung; Pak Chung Ho; Ernest Hung Yu Ng
Objective To evaluate ovarian response and cumulative live birth rate of women undergoing in-vitro fertilization (IVF) treatment who had discordant baseline serum anti-Mullerian hormone (AMH) level and antral follicle count (AFC). Methods This is a retrospective cohort study on 1,046 women undergoing the first IVF cycle in Queen Mary Hospital, Hong Kong. Subjects receiving standard IVF treatment with the GnRH agonist long protocol were classified according to their quartiles of baseline AMH and AFC measurements after GnRH agonist down-regulation and before commencing ovarian stimulation. The number of retrieved oocytes, ovarian sensitivity index (OSI) and cumulative live-birth rate for each classification category were compared. Results Among our studied subjects, 32.2% were discordant in their AMH and AFC quartiles. Among them, those having higher AMH within the same AFC quartile had higher number of retrieved oocytes and cumulative live-birth rate. Subjects discordant in AMH and AFC had intermediate OSI which differed significantly compared to those concordant in AMH and AFC on either end. OSI of those discordant in AMH and AFC did not differ significantly whether either AMH or AFC quartile was higher than the other. Conclusions When AMH and AFC are discordant, the ovarian responsiveness is intermediate between that when both are concordant on either end. Women having higher AMH within the same AFC quartile had higher number of retrieved oocytes and cumulative live-birth rate.
Gynecologic and Obstetric Investigation | 2003
Wai Man Cheung; Ernest Hung Yu Ng; Estella Yee Lan Lau; William S.B. Yeung; William W. K. So; Pak Chung Ho
A retrospective analysis of fresh in vitro fertilization treatment cycles and frozen embryo transfer (FET) cycles from mid-1995 to December 31, 1998, was undertaken. Nurses performed embryo transfer (ET) for government-funded cycles, whereas doctors performed ET for self-funded cycles. During the study period, fresh ET was performed in 1,165 treatment cycles. There were no significant differences in demographic data, ovarian responses and the number of embryos replaced between ET cycles performed by nurses and doctors. Pregnancy rates for ETs performed by nurses and doctors were 16.7 and 15.8% per transfer, respectively, whereas the corresponding implantation rates were 8.3 and 6.9%, respectively. Similar pregnancy and implantation rates were encountered in FET cycles whether ET was performed by nurses or doctors.
Hong Kong medical journal = Xianggang yi xue za zhi | 2016
Vcy Lee; Judy F.C. Chow; Estella Yee Lan Lau; Kwong A; Leung Sy; William S.B. Yeung; Pak Chung Ho; Ernest Hung Yu Ng
A 33-year-old woman was referred for consideration of PGD because she was a BRCA2 gene mutation carrier. She had cancer of the right breast at the age of 24 years and underwent modified radical mastectomy with axillary dissection and immediate latissimus dorsi flap reconstruction. Adjuvant chemoradiotherapy was given and she was prescribed tamoxifen for 5 years after the operation. Her paternal grandmother had breast cancer diagnosed at the age of 60 years. Genetic screening was performed and confirmed the patient to be a BRCA2 mutation carrier. Her elder brother and her father underwent the spot test and were found to carry a BRCA2 mutation but her younger sister was not affected. Laparoscopic ovarian cystectomy was performed for a hyperechoic cyst noted over the right ovary, which was confirmed to be an endometriotic cyst. After a multidisciplinary meeting of clinical geneticists, breast surgeons, oncologists, gynaecologists, psychologists, nurses, and academics in the ethics department, followed by psychological assessment and also counselling, she was offered in-vitro fertilisation (IVF) and PGD. Her IVF and PGD cycle was performed in 2011, using an antagonist protocol with letrozole co-treatment. Fifteen oocytes were retrieved and 12 were fertilised following intracytoplasmic sperm injection (ICSI). Blastomere biopsy was performed on eight goodquality cleaving embryos and five were confirmed to be free of the BRCA2 mutation. Two unaffected blastocysts were transferred, resulting in a singleton pregnancy and one unaffected blastocyst was cryopreserved. She delivered a baby boy at term by caesarean section. Postnatal cord blood confirmed Hong Kong Med J 2016;22:289–91 DOI: 10.12809/hkmj144499
Human Reproduction | 2000
Ernest Hung Yu Ng; William S.B. Yeung; Estella Yee Lan Lau; W. W. K. So; Pak Chung Ho