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Oyesanya OA, Teo SK, Quah E, Abdurazak N, Lee FY, Cheng WC. Pituitary down-regulation prior to in-vitro fertilization and embryo transfer: a comparison between a single dose of Zoladex depot and multiple daily doses of Suprefact. Hum Reprod 1995; 10:1042-4. [PMID: 7657737 DOI: 10.1093/oxfordjournals.humrep.a136090] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
In order to further evaluate the endocrinological, embryological and clinical efficacy of a single injection of the gonadotrophin-releasing hormone (GnRH) analogue Zoladex (goserelin), 142 women underwent pituitary down-regulation prior to in-vitro fertilization and embryo transfer: 71 with a single injection of Zoladex depot (group I) and 71 matched controls with multiple daily injections of Suprefact (buserelin; group II). Ovarian stimulation was performed with human menopausal gonadotrophin (HMG) and ovulation induction with human chorionic gonadotrophin (HCG). HMG and hydroxyprogesterone caproate depot were given for luteal phase support. The mean (+/- SD) age (34.01 +/- 4.42 versus 34.81 +/- 4.00 years), mean total dosage of HMG (61.25 +/- 26.87 versus 56.17 +/- 25.18 ampoules), mean daily dosage of HMG (4.74 versus 4.94 ampoules), duration of HMG stimulation (12.91 +/- 3.68 versus 11.31 +/- 3.46 days) and oestradiol concentration on the day of HCG (10,082 +/- 8007 versus 9440 +/- 7840 pmol/l) were similar in both groups but the mean total number of injections (GnRH and HMG) (13.55 +/- 3.35 versus 55.37 +/- 31.92) was significantly lower in group I. Furthermore, the proportion of women down-regulated by 2 weeks and pregnancy rate per embryo transfer were significantly higher in the Zoladex group, while miscarriage rates were similar. We conclude that a single dose of Zoladex is quicker, more convenient and should be investigated as an equally effective alternative to multiple doses of Suprefact for pituitary down-regulation prior to assisted conception. Further studies are required to test the teratogenicity and effectiveness of Zoladex.
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Liao JJ, Wong CW, Cheng WC, Tzaan WC. Postictal neurogenic pulmonary edema during uncal herniation--a case report and literature review. CHANGGENG YI XUE ZA ZHI 1995; 18:68-72. [PMID: 7767858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A 13-year-old boy fell off a tree and developed an acute subdural hematoma (SDH) which was treated conservatively because the patient was fully conscious. After a generalized tonic-clonic seizure, he manifested signs of uncal herniation and neurogenic pulmonary edema (NPE). The patient made a good recovery after craniotomy and evacuation of the SDH with intensive pulmonary care. Though rare, uncomplicated postictal NPE in children almost runs a smooth course with favorable outcomes. However, the mortality rate is high in postictal NPE complicating cerebral herniation, and it seems an exception that our patient made a good recovery.
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Kiu MC, Chang CN, Cheng WC, Lin TK, Wong CW, Tang SG, Leung WM, Chen LH, Ho YS, Ng KT. Combination chemotherapy with carmustine and cisplatin before, during, and after radiotherapy for adult malignant gliomas. J Neurooncol 1995; 25:215-20. [PMID: 8592171 DOI: 10.1007/bf01053154] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Twenty-two patients, aged 16 to 67, who had malignant gliomas after surgical resection were treated with carmustine and cisplatin intravenous infusion before, during, and after radiotherapy. All patients had subtotal or total resection, or biopsy as the initial procedure. Twenty-one patients who had at least 2 cycles of chemotherapy and finished the whole course of radiotherapy were considered to be evaluable for responses. Among them, 5 had glioblastoma multiforme, 16 had anaplastic astrocytoma. The median time to tumor progression was 35 weeks (range 12-130 weeks) and median survival time was 66 weeks (range 10-156 weeks). Early progression occurred more frequently in patients with biopsy only and subtotal resection, and in patients with glioblastoma than in those with anaplastic astrocytoma. This combined modality treatment program was associated with reversible hematologic toxicity which was severe in 2 patients, and with ototoxicity in 1 patient, nephrotoxicity in 2 patients. Combination of carmustine and cisplatin with cranial irradiation for malignant gliomas is moderately toxic and appears to offer no obvious survival advantage compared with radiation therapy plus BCNU alone.
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Cheng WC, Schuckers PL, Hauser G, Burch J, Emmett JG, Walker B, Law E, Wakefield D, Boyle D, Lee M. Psychosocial needs of family caregivers of terminally ill patients. Psychol Rep 1994; 75:1243-50. [PMID: 7892387 DOI: 10.2466/pr0.1994.75.3.1243] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The primary caregivers (mean age = 63 yr.) of 28 terminally ill veterans (mean age = 67 yr.) who were living at home were surveyed for their concrete and psychosocial needs. The caregivers also completed the Beck Depression Inventory, the Life Satisfaction Index, the Provision of Social Relations scale, and the Burden Inventory. The rank order of concrete and psychosocial needs is reported for these caregivers. Increased scores on depression were associated with decreased life satisfaction as was low social support. Not surprisingly, higher numbers of concrete and psychosocial needs were associated with increases in depression.
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Cheng WC, Chang CN, Lin TK. Chylothorax after endoscopic sympathectomy: case report. Neurosurgery 1994; 35:330-2; discussion 332. [PMID: 7969846 DOI: 10.1227/00006123-199408000-00025] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Endoscopic sympathectomy is a new trend for the treatment of hyperhidrosis palmaris. It is a simple and effective technique; however, it carries some recognized risks such as Horner's syndrome and pneumohemothorax. We recently encountered a case complicated by the development of a chylothorax. The patient was a 23-year-old healthy women with profuse palmar sweating. She developed an intractable dry cough after a transthoracic endoscopic sympathectomy. A chest x-ray revealed a left pleural effusion. A chylous effusion was found after thoracentesis and fluid analysis. The pleural effusion resolved after chest tube drainage and diet control. Although endoscopic sympathectomy is a simple and quick procedure, unusual complications, such as chylothorax, may occur. Appropriate early recognition and treatment can prevent a disastrous result.
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Hung SY, Cheng WC, Chang CN. Benign osteoblastoma of the spine--report of two cases. CHANGGENG YI XUE ZA ZHI 1994; 17:85-9. [PMID: 8205504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Benign osteoblastoma is a rare spinal tumor, with the posterior element mainly involved. Symptoms do vary and there is a long diagnostic delay, especially in young people. We present two cases of benign osteoblastoma. One occurred in the atlas and presented with a painless neck mass. The other occurred in the lumbar spine with symptoms of long-term spinal pain and radicular pain. Preoperative Technetium bone scan and computed tomography (CT) resulted in exact localization and better operative planning. En bloc excision of tumor is indicated for complete pain relief and full return of spinal mobility.
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Cheng WC, Chang CN, Lui TN, Lee ST, Wong CW, Lin TK. Surgical treatment for ossification of the posterior longitudinal ligament of the cervical spine. SURGICAL NEUROLOGY 1994; 41:90-7. [PMID: 8115959 DOI: 10.1016/0090-3019(94)90104-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Ossification of the posterior longitudinal ligament (OPLL) is a degenerative disease of the spine, usually found in the cervical vertebrae. Most symptomatic patients present with a myelopathy or myeloradiculopathy. Surgical decompression is the preferred treatment. The choice of operative approach, anterior or posterior, is still controversial. From January 1986 to June 1992, 20 patients with this condition received operations at Chang Gung Memorial Hospital. The clinical manifestations and the results of treatment are analysed. The ideal surgery seems to be the anterior approach with bone fusion. If, however, the OPLL involves more than three segments, the posterior approach with an expansive laminoplasty would be the better alternative technique.
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Chen TY, Wong CW, Chang CN, Lui TN, Cheng WC, Tsai MD, Lin TK. The expectant treatment of "asymptomatic" supratentorial epidural hematomas. Neurosurgery 1993; 32:176-9; discussion 179. [PMID: 8437654 DOI: 10.1227/00006123-199302000-00004] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Seventy-four patients with a traumatic epidural hematoma (EDH) and a Glasgow Coma Scale score of more than 12 received expectant treatment; 14 subsequently underwent surgical evacuation of the EDH. A patient with initial brain computed tomograms (CT) showing an EDH volume of more than 30 ml, a thickness of more than 15 mm, and a midline shift beyond 5 mm tended to require surgery within 3 days of the injury when the brain had exhausted its compensatory mechanism and yielded to the expanding EDH. After the 3-day period, in the absence of neurological symptoms, the presence of the EDH may not be an indication for surgical evacuation or hospitalization beyond 7 days. In our patients, the presence of a skull fracture in the temporal bone, the heterogeneous density of the EDH in the CT scan, or the 6-hour period between the CT study and the injury did not significantly increase the failure rate of nonsurgical treatment. Although a zero mortality was achieved in this series, these guidelines may not be applicable to the management of an infratentorial EDH.
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Lui TN, Lee ST, Chang CN, Cheng WC. Epidural hematomas in the posterior cranial fossa. THE JOURNAL OF TRAUMA 1993; 34:211-5. [PMID: 8459457 DOI: 10.1097/00005373-199302000-00005] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A review of 89 cases of posterior fossa epidural hematoma (PFEDH) is presented. The mortality rate was 17.9%. In 44 cases (49.4%) there were associated intracranial hematomas. In 30 cases the hematoma was localized within the boundary of the foramen magnum and the transverse and sigmoid sinuses ("pure" PFEDH). In 59 cases the hematoma extended beyond the sinuses to the occipital area ("mixed" PFEDH). In the pure PFEDHs, the bleeder could be identified in only six cases and in five cases the source was a bleeding transverse sinus. The bleeders disclosed in the mixed PFEDHs were a torn transverse sinus in 28 cases, a meningeal artery in three cases, and a bony fracture in three cases. The possibility of a PFEDH should be kept in mind when evaluating patients who have suffered an occipital blow resulting in a frontal or temporal hematoma. In our series, patients with the pure PFEDHs with no associated intracranial hematomas had the best prognoses. Nine patients developed a PFEDH after surgery for a supratentorial hematoma. In 14 cases the PFEDH was treated at the subacute or chronic stage. All but one patient survived with a good recovery. Children generally had better prognoses.
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Bennett SJ, Waterstone JJ, Cheng WC, Parsons J. Complications of transvaginal ultrasound-directed follicle aspiration: a review of 2670 consecutive procedures. J Assist Reprod Genet 1993; 10:72-7. [PMID: 8499683 DOI: 10.1007/bf01204444] [Citation(s) in RCA: 153] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
PURPOSE Complications following transvaginal ultrasound-directed follicle aspiration are rare, making it difficult to assess their true incidence. During a 4-year prospective study the complications arising from a series of 2670 consecutive procedures were monitored. RESULTS Vaginal hemorrhage occurred in 229 (8.6%) of the cases, with a significant loss (> 100 ml) in 22 (0.8%). Postoperative pelvic infection occurred in 18 (0.6%) of the cases. Hemorrhage from the ovary with hemoperitoneum formation was seen on two occasions and necessitated emergency laparotomy in one instance. A single case of pelvic haematoma formation from a punctured iliac vessel was also recorded; this settled without intervention. Of the 18 cases with infection, 9 were severe with pelvic abscess formation; microbiological examination of the pus from these cases suggests that the most common route of infection in such cases is probably by direct inoculation of vaginal organisms into the peritoneal cavity by the collecting needle. CONCLUSION The low incidence of pelvic infection questions the value of using prophylactic antibiotics. No increased risk of infection was demonstrated in cases with preexisting peritoneal damage.
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Oyesanya OA, Cheng WS, Quah EM, Cheng WC. Outcome of cryopreservation and subsequent programmed replacement of frozen-thawed embryos in an in vitro fertilisation programme: preliminary report and proposals for improvement. ANNALS OF THE ACADEMY OF MEDICINE, SINGAPORE 1992; 21:471-5. [PMID: 1309114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
In order to prevent wastage of good quality embryos and limit the number transferred in fresh in vitro fertilisation (IVF) cycles, 577 supernumerary embryos were cryopreserved for a mean duration of 6.23 +/- 4.7 months (range 1-24). Four hundred and twenty-two have been thawed so far of which 81 (19.19%) were totally lysed, 317 (75.12%) survived with at least 50% of their blastomeres intact and 180 (42.65%) cleaved. Two hundred and sixteen frozen-thawed embryos have been transferred in 62 stimulated and 11 natural cycles involving 61 patients. The mean number of embryos transferred per cycle was 2.96 +/- 0.86. Twenty-one pregnancies resulted from the 62 stimulated cycles (33.87%). No pregnancy occurred in the 11 natural cycles. Overall pregnancy rate was therefore 28.77%. Eleven singletons (eight male; three female) and one set of twins (one male one female) have so far been delivered in good condition:- six (54.5%) by caesarean section, five (45.5%) vaginally, including one by Neville Barnes forceps, one ventouse and the rest were spontaneous. Presentation was cephalic in 10 (91%) and breech in one case (9%). All were delivered at term except one premature (9%). Mean birth weight was 3.23 +/- 0.32 kg for singletons and 2.7 kg for the twins. Despite the diversity of racial, cultural and religious differences in our multinational patient population, we found embryo cryopreservation following IVF generally acceptable and our preliminary results are quite encouraging. Strategies for improving the outcome of future cycles are proposed.
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Yang YJ, Chien YY, Cheng WC. Vertebrobasilar insufficiency related to cervical spondylosis. A case report and review of the literature. CHANGGENG YI XUE ZA ZHI 1992; 15:100-4. [PMID: 1515970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A 64-year-old man suffered from symptoms of vertebrobasilar insufficiency (VBI) while turning his head to the left. Roentgenograms of the cervical spines showed severe spondylosis. Cerebral angiography demonstrated compression of the left vertebral artery by osteophytes of the cervical spine when the patient turned his head to the left. He was treated surgically by fixation of the vertebral bodies with good relief of symptoms during one year of follow-up. VBI induced by spondylotic compression of the vertebral artery is uncommon. We therefore reviewed the literature and suggested a more simple method of operation.
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Abstract
Carotid-cavernous sinus fistulas are not rare, but they have never been reported in association with persistent primitive trigeminal artery. We recently encountered such a case. The Jaeger-Hamby procedure was employed, with mandatory occlusion of the primitive trigeminal artery.
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Lee ST, Lui TN, Chang CN, Cheng WC. Early postoperative seizures after posterior fossa surgery. J Neurosurg 1990; 73:541-4. [PMID: 2398384 DOI: 10.3171/jns.1990.73.4.0541] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A review is reported of the seizure incidence in 726 patients who underwent 740 posterior fossa operations via a suboccipital craniectomy without prophylactic anticonvulsant agents. Thirteen patients (1.8%) experienced seizures within 2 weeks postoperatively. Five of these patients (0.7% of the series) had seizures within 24 hours after operation. The incidence was highest for patients with medulloblastoma (7.2%) followed by those with astrocytoma (2.3%). Also, a higher percentage was found in patients with preoperative ventriculoperitoneal shunt or intraoperative ventriculostomy (2.7%) than in those without (1%), but the difference was not statistically significant. Metabolic acidosis (80%) and hyponatremia (20%) were the major causes of the seizures that developed within 24 hours after operation. Follow-up computerized tomography showed no definite lesion in these patients. Hydrocephalus (75%) and supratentorial hemorrhage remote from the operative site (25%) were detected in the patients who developed seizures between the 2nd and 14th postoperative day. Two of these patients also had postoperative bacterial meningitis. This review suggests that seizures are a possible complication in the early postoperative period after suboccipital craniectomy for posterior fossa lesions.
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Abayomi D, Cheng WC. Initial experience with IVF-ET at Thomson Fertility Clinic, Thomson Medical Centre, Singapore. JOURNAL OF IN VITRO FERTILIZATION AND EMBRYO TRANSFER : IVF 1990; 7:123-5. [PMID: 2358730 DOI: 10.1007/bf01135589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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66
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Wei CP, Cheng WC, Chang CN, Lee ST, Lui TN, Wang AD. Upper lumbar disc herniation. CHANGGENG YI XUE ZA ZHI 1989; 12:193-9. [PMID: 2637057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Herniations of the upper lumbar disc have often been overlooked due to a relatively low incidence we had 457 lumbar disc surgeries from January 1978 to June 1987. Twenty-two of them were of the upper three lumbar discs. We analyzed these patients according to their clinical syndromes, radiological findings and surgical results. The characteristic features of anterior thigh pain from upper lumbar disc herniation were different from the more commonly seen fourth and fifth lumbar disc herniation which resulted in sciatica. The incidence of cauda equina syndrome was relatively high in our series (36%). All the 22 cases had correlated X-ray findings. Satisfactory operative results for upper lumbar disc herniation were achieved in 20 of 22 (90%).
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Lee ST, Lui TN, Chang CN, Cheng WC, Wang DJ, Heimburger RF, Lin CG. Prophylactic anticonvulsants for prevention of immediate and early postcraniotomy seizures. SURGICAL NEUROLOGY 1989; 31:361-4. [PMID: 2711309 DOI: 10.1016/0090-3019(89)90067-0] [Citation(s) in RCA: 78] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Phenytoin (15 mg/kg) was administered intravenously to 189 patients shortly before their intracranial, supratentorial surgery was completed. Intravenous phenytoin of 5-6 mg/kg/day in three divided doses was administered daily for the first 3 postoperative days. Therapeutic serum levels (10-20 micrograms/mL) were achieved in 113 (59.8%) patients. An equally constituted, randomized control group of 185 patients received a placebo under identical conditions. The group receiving phenytoin had only one immediate and two early postoperative seizures. The 185 controls had four immediate and nine early postoperative seizures. None of the follow-up computed tomography scans of the patients with seizures showed postoperative hematoma. One patient had a significant tension pneumocranium, a possible cause of postoperative seizures. To avoid a decrease in the serum anticonvulsant level due to intraoperative blood loss, it is suggested that for patients who need an urgent or emergent craniotomy, prophylatic anticonvulsant medication should be given at least 20 minutes before completion of wound closure.
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68
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Mulligan ME, Halebian S, Kwok RY, Cheng WC, Finegold SM, Anselmo CR, Gerding DN, Peterson LR. Bacterial agglutination and polyacrylamide gel electrophoresis for typing Clostridium difficile. J Infect Dis 1986; 153:267-71. [PMID: 3080531 DOI: 10.1093/infdis/153.2.267] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Bacterial agglutination and polyacrylamide gel electrophoresis (PAGE) were methods evaluated for typing strains of Clostridium difficile. A panel of four antisera, obtained by immunizing rabbits with washed whole cells of different strains of C. difficile, produced distinctive patterns of agglutination. Ethylenediaminetetraacetate (EDTA) extracts subjected to PAGE also produced distinctive protein profiles. Excellent correlation between the two methods was observed when geographically distant isolates were typed without knowledge of their clinical origin. Both typing methods should receive further evaluation for their value as tools for epidemiological studies.
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69
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Cheng WC, Gupta RK, Morton DL. Characterization of antigenic components of immune complexes isolated from a melanoma patient. Immunol Invest 1985; 14:367-78. [PMID: 4065936 DOI: 10.3109/08820138509022672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Immune complexes (IC) from the serum of a melanoma patient were partially purified with DEAE Affigel Blue. The IC were radioiodinated and then immobilized with activated Sepharose 4B. Immunologically bound components in the IC were dissociated with 3M MgCl2 followed by gel filtration chromatography. A distinct antigen component of about 700,000 daltons was obtained by refractionation of a region of the chromatogram containing antigenic activity by Sephacryl S-300 column chromatography. Though the antigenic component behaved as a single entity in the gel filtration, it consisted of at least five polypeptide chains that were revealed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis under reducing conditions. However, 92,000 and 41,000 dalton subunits were predominant. This procedure may be useful for isolating tumor antigens from circulating IC of cancer patients.
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Cheng WC, Webb E, Vedros N, Ng J. Fractionation and characterization of surface antigens from group A Neisseria meningitidis. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1975; 114:1497-505. [PMID: 804516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Group A meningococcal surface components were first subjected to fractionation with a mixture of chloroform-methanol. Sodium dodecyl sulfate-acrylamide gel electrophoresis of the aqueous phase containing 30 to 40% of the original material revealed only two polypeptide components and a slowly migrating carbohydrate component. The soluble fraction of the interphase was found to contain most of the bacterial surface proteins and the chloroform-methanol phase essentially all of the lipid components. The components of the aqueous phase were further fractionated by use of the hydrophobic affinity column, 4-phenylbutylamino-Sepharose and gradient elution with NaCl to yield fractions I and II. Fraction II was further separated into a minor and a major component (IIb) with Sepharose G-200. Fraction I contained the group A polysaccharide in ionic linkages with a minor polypeptide component (6%). It elicited bactericidal antibodies in rabbits and protected mice against homologous challenge, whereas the polysaccharide alone was non-immunogenic in these animals. Fraction IIb was a polysaccharide-polypeptide complex with unknown linkages; it induced a low concentration of rabbit antibodies that were bactericidal to group A and C meningococci. Mice vaccinated with fraction IIb were most resistant to homologous challenge and the resistance was also extended to challenges with group B and C cells. Fractions I and IIb appeared to be useful alternatives to the currently employed group-specific polysaccharide vaccines for the protection against drug-resistant meningococci. A simplified procedure for the preparation of group-specific polysaccharide was presented.
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71
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Hoffmann EM, Cheng WC, Tomeu EJ, Renk CM. Resistance of sheep erythrocytes to immune lysis by treatment of the cells with a human erythrocyte extract: studies on the site of inhibition. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1974; 113:1501-9. [PMID: 4424275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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72
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Cheng WC, Fraser KJ, Haber E. Fractionation of antibodies to the pneumococcal polysaccharides by affinity chromatography. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1973; 111:1677-89. [PMID: 4127299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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73
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Shanmugaratnam K, Muir CS, Tow SH, Cheng WC, Christine B, Pedersen E. Rates per 100,000 births and incidence of choriocarcinoma and malignant mole in Singapore Chinese and Malays. Comparison with Connecticut, Norway and Sweden. Int J Cancer 1971; 8:165-75. [PMID: 5118207 DOI: 10.1002/ijc.2910080120] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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74
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Cheng WC. The reaction of immunoglobulin-coated bentonite and radioiodinated antigen. II. Quantitative antigen-binding studies of antibodies and selectively isolated antibodies to 2,4-dinitrobenzene, 2,4-dinitro-5-aminobenzene and 2,4,6-trinitrobenzene. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1971; 106:150-9. [PMID: 5543706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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75
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Cheng WC, Talmage DW. The reaction of immunoglobulin-coated bentonite and radioiodinated antigen as a basis for antibody detection and antigen binding. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1969; 103:1385-94. [PMID: 4188337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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76
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Cheng WC. The value of amniography in early diagnosis of hydatidiform mole. THE JOURNAL OF OBSTETRICS AND GYNAECOLOGY OF THE BRITISH COMMONWEALTH 1967; 74:753-6. [PMID: 6058540 DOI: 10.1111/j.1471-0528.1967.tb03792.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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77
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Tow WS, Cheng WC. Treatment of choriocarcinoma. BRITISH MEDICAL JOURNAL 1967; 2:764. [PMID: 6067369 PMCID: PMC1841776 DOI: 10.1136/bmj.2.5554.764-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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78
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Tow WS, Cheng WC. Treatment of choriocarcinoma. BRITISH MEDICAL JOURNAL 1967; 2:699. [PMID: 4290413 PMCID: PMC1842301 DOI: 10.1136/bmj.2.5553.699-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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79
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80
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Cheng WC, Talmage DW. Fractionation of purified antibodies to the dinitrophenyl group with cross-reacting immunoadsorbents. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 1966; 97:778-90. [PMID: 5955832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Cheng WC. Nerve tumour of the clitoris. Report of a case and commentary. THE JOURNAL OF OBSTETRICS AND GYNAECOLOGY OF THE BRITISH COMMONWEALTH 1966; 73:1016-7. [PMID: 5927774 DOI: 10.1111/j.1471-0528.1966.tb06134.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Cheng WC, Talmage DW. Isolation of anti-dinitrophenyl group antibodies with a triply substituted cross-reacting antigen. J Biol Chem 1965; 240:3530-7. [PMID: 4158150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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