401
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402
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Chan P. A modest proposal: a vow of chastity for single physicians in remote areas? JAMA 1992; 267:934. [PMID: 1734103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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403
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404
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Di Monte DA, Chan P, Sandy MS. Glutathione in Parkinson's disease: a link between oxidative stress and mitochondrial damage? Ann Neurol 1992; 32 Suppl:S111-5. [PMID: 1510368 DOI: 10.1002/ana.410320719] [Citation(s) in RCA: 88] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Several links exist between the two mechanisms of neuronal degeneration (i.e., oxygen radical production and mitochondrial damage) proposed to have a role in Parkinson's disease. Indeed, mitochondria are critical targets for the toxic injury induced by oxygen radicals, and experimental evidence suggests that mitochondrial damage may cause an increased generation of oxygen radicals. A potentially important link between these two mechanisms of neurodegeneration is glutathione. Because of the scavenging activity of glutathione against accumulation of oxygen radicals, its decrease in the brains of parkinsonian patients has been interpreted as a sign of oxidative stress; however, this change may also result from or lead to mitochondrial damage. It is conceivable therefore that regardless of whether oxidative stress or mitochondrial damage represents the initial insult, these toxic mechanisms may both contribute to neuronal degeneration via changes in glutathione levels.
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405
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Chan P, DeLanney LE, Irwin I, Langston JW, Di Monte D. Rapid ATP loss caused by 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine in mouse brain. J Neurochem 1991; 57:348-51. [PMID: 2051170 DOI: 10.1111/j.1471-4159.1991.tb02134.x] [Citation(s) in RCA: 194] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The effects of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) on ATP levels in different areas of mouse brain were studied after rapid fixation of cerebral tissue in situ by microwave irradiation. ATP levels in the striatum, ventral mesencephalon, and cerebellum of untreated C57BL/6 mice killed by microwave irradiation were 2-3 times greater than values measured in the brains of animals killed by cervical dislocation. In microwaved mice, administration of MPTP (40 mg/kg s.c.) caused a 10-20% decrease in ATP concentrations as compared to control animals injected with saline. This decrease was relatively rapid and selective because it occurred in both the striatum and ventral mesencephalon, but not in the cerebellar and frontal cortex, at 30, 60, 120, and 240 min after MPTP exposure. Furthermore, ATP loss in the striatum was prevented by mazindol, a catecholamine uptake blocker, indicating a rather selective effect of MPTP on the ATP content of dopaminergic terminals. Results of this study are consistent with mitochondrial damage in the MPTP model of parkinsonism and provide the first direct experimental evidence in vivo that a decrease in ATP may play a role in MPTP-induced neurotoxicity.
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406
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Chan P, Lee CP, Lee YH. Coarctation of aorta coexisting with pheochromocytoma: report of a case. J Formos Med Assoc 1990; 89:1009-11. [PMID: 1982120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A patient was admitted for a study of his hypertension because coarctation of the aorta (COA) was suspected. His history also provided clues of pheochromocytoma. A computed tomography (CT) scan revealed a right-side supraadrenal tumor. A study of urine catecholamine showed a strong positive result. Cardiac catheterization revealed that the patient had a postductal COA and a supraadrenal tumor. Surgery and pathology confirmed that the patient had pheochromocytoma.
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407
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Smith WJ, Gross CL, Chan P, Meier HL. The use of human epidermal keratinocytes in culture as a model for studying the biochemical mechanisms of sulfur mustard toxicity. Cell Biol Toxicol 1990; 6:285-91. [PMID: 2147571 DOI: 10.1007/bf02443803] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Human epidermal keratinocytes in culture were studied to evaluate their usefulness in demonstrating toxic events following exposure to sulfur mustard. Exposure of keratinocytes to sulfur mustard over a concentration range of 1-1000 microM HD, reduced NAD + levels from 96% to 32% of control levels. When keratinocytes were exposed to a concentration of 300 microM HD, NAD + levels began to fall at 1 hour and reached a plateau of 47% of control levels at 4 hours. Niacinamide, an inhibitor of the enzyme poly(ADP-ribose) polymerase, partially protected mustard-exposed cells against NAD + depletion. It also protected cellular viability as assessed by vital staining 24 hours after exposure. This protection was not seen in long-term (72 hr) cultures. These studies suggest that human epidermal keratinocytes in culture can serve as a useful in vitro model for research into the biochemical mechanisms of sulfur mustard-induced cutaneous injury.
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408
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Tredway DR, Chan P, Henig I, Gullett A, Cheatwood M. Effectiveness of stimulated menstrual cycles and Percoll sperm preparation in intrauterine insemination. THE JOURNAL OF REPRODUCTIVE MEDICINE 1990; 35:103-8. [PMID: 2154579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
To examine the usefulness of intrauterine insemination in women with various fertility factors, we retrospectively analyzed data from women treated during 1986 and 1987. Ninety-three patients underwent 1-11 cycles of single or double procedures, for a total of 423 inseminations in 263 treatment cycles. Twenty-six patients (28%) conceived, for a 10% total pregnancy rate per cycle, with 58% of the pregnancies resulting from double inseminations per cycle. An average of two treatment cycles was required to achieve pregnancy. Eight pregnancies (31%) occurred in spontaneous cycles, while 18 (69%) occurred in stimulated cycles. While clomiphene citrate therapy was useful in anovulatory patients, it was of no benefit in ovulatory patients being treated with intrauterine insemination. Human menopausal gonadotropin therapy was of benefit in both ovulatory and anovulatory patients when combined with intrauterine insemination. The live birth rate was higher (75%) in spontaneous cycles than in stimulated cycles (44%). Semen preparation was accomplished by sperm washing in 61% of the pregnancies and by Percoll preparation in 39%. The effectiveness of the discontinuous Percoll gradient for semen preparation for insemination was suggested by a pregnancy rate of 9% per cycle. While the mean sperm count in the pregnant group was 44 million, successful pregnancy was accomplished with a double insemination of 880,000 and 1.16 million rapidly progressive sperm in the first and second inseminate, respectively. The data confirm the important role of intrauterine insemination for the treatment of infertility.
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409
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410
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Henig I, Chan P, Tredway DR, Maw GM, Gullett AJ, Cheatwood M. Evaluation of the Pipelle curette for endometrial biopsy. THE JOURNAL OF REPRODUCTIVE MEDICINE 1989; 34:786-9. [PMID: 2795561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The Pipelle endometrial suction curette was evaluated, and its application and effectiveness were compared to those of the Novak curette for endometrial sampling during the midluteal phase. Fifty women underwent an endometrial biopsy with the Pipelle and Novak curettes. Ninety percent of the women preferred the biopsy with the Pipelle. Histologically, tissue obtained with the Pipelle was satisfactory and similar to that with the Novak. The Pipelle curette appears to be an excellent device for midluteal endometrial biopsy during an infertility evaluation.
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411
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Abstract
TVE is mainly a disease of intravenous drug abusers. Although the infecting organisms are often highly virulent, they frequently respond to medical treatment. The prognosis for patients with TVE is fairly good. About 25% of TVE patients require surgical intervention. Persistent sepsis and intractable congestive heart failure are indications for surgery. Tricuspid valvulectomy without prosthetic replacement is the surgical intervention of choice. Right-sided heart failure is the principal complication after valvulectomy without a prosthesis. A significant percentage of patients require insertion of prosthetic valves at a future date.
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412
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Scoble JE, Senior JC, Chan P, Varghese Z, Sweny P, Moorhead JF. In vitro cyclosporine toxicity. The effect of verapamil. Transplantation 1989; 47:647-50. [PMID: 2539665 DOI: 10.1097/00007890-198904000-00016] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The epithelial cell line LLC-PK1, which expresses many proximal tubular characteristics, was used to investigate the relationship between calcium, the calcium channel blocker verapamil, and cyclosporine toxicity. The LLC-PK1 cells took up cyclosporine when this was added in a concentration of 2 micrograms/ml, and this uptake was maximal at 30 min (112 +/- 3 ng cyclosporine/mg cell protein). At 12 micrograms/ml it inhibited the sodium glucose cotransporter, as assessed by phlorizin-inhibitable 14C-alpha-methyl glucopyranoside (alpha-MG) uptake (control 37.2 +/- 6.3, 12 micrograms/ml 21.2 +/- 1.1 mumol/hr/mg protein). Cyclosporine at 2 micrograms/ml did not affect cell growth after 5 days (control 945 +/- 60 micrograms cell protein per 25 cm2 flask, 2 micrograms/ml cyclosporine/ml 1046 +/- 32 micrograms protein/flask), even in the presence of 7.6 mM ionized calcium (862 +/- 37 micrograms protein/flask). Cyclosporine at 12 micrograms/ml inhibited cell growth (286 +/- 27 micrograms protein/flask), and raising the ambient ionized calcium concentration to 7.6 mM reduced cell growth further (91 +/- 6 micrograms protein/flask). Cyclosporine at concentrations of 2 and 12 micrograms/ml produced increasing cell vacuolation, as seen in vivo. Short-term uptake of 2 micrograms/ml cyclosporine could be inhibited by 1.0 mM and 0.5 mM verapamil (49 +/- 9.5 and 71 +/- 6.4 ng cyclosporine/mg cell protein, respectively, at 30 min). However, in the presence of 2 micrograms/ml cyclosporine 0.1 mM verapamil was toxic to the cells grown over five days (44 +/- 5 micrograms protein/flask). At 0.01 mM verapamil was not toxic to cell growth (921 +/- 29 micrograms protein/flask), but raising the medium calcium to 7.6 mM reduced cell growth (652 +/- 96 micrograms/ml). Inhibition of cyclosporine uptake did not occur with 0.01 mm verapamil (control 145.6 +/- 12.3 vs. 0.01 mM verapamil 150.4 +/- 3.8 ng cyclosporine/mg cell protein). The LLC-PK1 cell line represents a good in vitro model for cyclosporine renal tubular toxicity, as the in vivo observation of glycosuria and proximal tubular cell vacuolation in cyclosporine nephrotoxicity can be reproduced. In vitro this is shown to be associated with inhibition of sodium-dependent glucose cotransport. Verapamil inhibited cyclosporine uptake, but only at concentrations that were toxic to the cells. Verapamil potentiated rather than reduced the increased cyclosporine toxicity produced by increasing the medium calcium concentration. The suggested protective effect of verapamil against cyclosporine nephrotoxicity is therefore unlikely to be due to inhibition of cyclosporine uptake or of calcium entry into proximal tubular cells.
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413
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Chan P, Scoble JE, Senior JM, Varghese Z, Sweny P, Moorhead JF. Cyclosporin inhibition of glucose transport in cell culture. Transplant Proc 1989; 21:922-3. [PMID: 2705257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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414
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Gibney RT, Stollery DE, Lefebvre RE, Sharun CJ, Chan P. Continuous arteriovenous hemodialysis: an alternative therapy for acute renal failure associated with critical illness. CMAJ 1988; 139:861-6. [PMID: 3179891 PMCID: PMC1268341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Critically ill patients often cannot tolerate conventional hemodialysis because of hemodynamic instability. Continuous arteriovenous hemofiltration provides control of fluid and electrolyte balance but is inefficient in the management of azotemia. Continuous arteriovenous hemodialysis (CAVHD) combines dialysis with hemofiltration. We performed 15 CAVHD treatments of 2 or more days' duration in 12 critically ill patients aged 23 to 85 (mean 64.4) years who had acute oliguric renal failure as a component of multiple organ system failure and who were unsuitable for conventional hemodialysis. The total treatment time was 106 days. The serum creatinine and urea levels were controlled in all the patients during CAVHD. The ultrafiltrate losses were sufficient to allow appropriate nutrition and fluid administration and still maintain a negative fluid balance. Renal function returned in five patients (42%), of whom four survived to be discharged home. CAVHD is an effective means of managing acute oliguric renal failure in critically ill patients.
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415
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Chan P, Vincent JW, Wangemann RT. Accelerated healing of carbon dioxide laser burns in rats treated with composite polyurethane dressings. ARCHIVES OF DERMATOLOGY 1987; 123:1042-5. [PMID: 3115190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Healing time, infection rate, and residual scar formation were compared in carbon dioxide laser burns in rats treated in four ways: Spandra composite dressing, OpSite composite dressing, Petrolatum Gauze (USP), and no treatment. There were no infections and no differences in scar formation among the treatment groups. The mean healing times were ten days for the polyurethane dressings (Spandra and OpSite), 13 days for Petrolatum Gauze, and 16 days for the untreated group. Spandra was easier to apply and handle than OpSite. These findings suggest that synthetic gas-permeable dressings promote healing after cutaneous carbon dioxide laser surgery more effectively than conventional treatments of ointment-impregnated gauze or leaving the wound exposed to the air.
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416
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Chan P. Accelerated healing of carbon dioxide laser burns in rats treated with composite polyurethane dressings. ACTA ACUST UNITED AC 1987. [DOI: 10.1001/archderm.123.8.1042] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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417
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Chan P, Chapman JR, Morris PJ. Glycosuria: an index of cyclosporine nephrotoxicity. Transplant Proc 1987; 19:1780. [PMID: 3274422] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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418
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Hintz BL, Kagan AR, Chan P, Rao AR, Nussbaum H, Ryoo MC, Wollin M. Proposed method to study the factors affecting local control with combined external beam and interstitial implantation of mobile tongue and floor of mouth. J Surg Oncol 1986; 33:273-83. [PMID: 3784566 DOI: 10.1002/jso.2930330415] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Twenty-seven patients with squamous cell carcinoma of the mobile tongue and floor of the mouth were treated with external beam and interstitial radiation. Good prognostic factors were T1N0, T2N0, superficial tumors, tumor shrinkage by 75% with external beam, and no apparent tumor clinically 2 months after treatment. On the other hand, T3N0, T1-3N1, and deeply necrotic tumors had a poor prognosis. We recommend using a flexible afterloading system to implant the initial local tumor volume (not just the residual nidus) that does not exceed 45 cm3. The minimum (reference) dose was prescribed to a surface 1/2 cm beyond the most peripheral rim of radioactive sources. For acceptable local control and complication rates, our suggested minimum (reference) doses are less than or equal to 7,500 rads for T1 (or a time-dose-fractionation [TDF] of 131-140), less than or equal to 8,000 rads for T2 (TDF of 131-140), and probably less than 8,500 rads for T3 (TDF of less than or equal to 150). These guidelines should be considered preliminary.
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419
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Parkes JG, Chan P, Goldberg DM. Secretion of triglyceride lipase from rat hepatocytes in culture: modulation by insulin and phenobarbital. Biochem Cell Biol 1986; 64:1147-52. [PMID: 3548757 DOI: 10.1139/o86-151] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Hepatic triglyceride lipase (HTGL) was measured in primary rat hepatocytes maintained for 3 days under three different culture conditions: basal medium, basal medium plus insulin, and basal medium plus insulin and phenobarbital. The activity of HTGL secreted by these cells was measured by treating intact cells with heparin; intracellular enzyme was subsequently measured in cell homogenates. Insulin stimulated intracellular triglyceride lipase activity by 48% and extracellular lipase by 30%. Phenobarbital, an enzyme-inducing drug, caused a further 15% increase in extracellular hepatic triglyceride lipase; whereas, the intracellular activity was reduced. The presence of insulin greatly stimulated the rate of enzyme secretion, and this rate was not notably affected by the presence of phenobarbital. After 3 days in culture, the short term (2-8 h) synthesis and secretion of enzyme from cultures treated with insulin or insulin plus phenobarbital were equally inhibited by cycloheximide. Monensin also inhibited enzyme secretion in both cultures and caused a similar increase in intracellular lipase activities. Insulin did not significantly affect the proportion of intracellular enzyme (17.7% basal vs. 15.8% insulin). On the other hand phenobarbital produced a 20-30% reduction in the proportion of intracellular enzyme (12.5 vs. 17.7% basal or 15.8% insulin). These findings suggest a drug-induced redistribution of triglyceride lipase.
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420
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Atkinson K, Norrie S, Chan P, Zehnwirth B, Downs K, Biggs J. Hemopoietic progenitor cell function after HLA-identical sibling bone marrow transplantation: influence of chronic graft-versus-host disease. INTERNATIONAL JOURNAL OF CELL CLONING 1986; 4:203-20. [PMID: 3517192 DOI: 10.1002/stem.5530040306] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We examined hemopoietic reconstitution during the first 12 months post-transplant in 31 patients given high-dose cyclophosphamide, total body irradiation and an HLA-identical sibling marrow transplant for hematological malignancy. Unexpectedly, we found marrow CFU-gm and marrow CFU-e cells to be denser than normal throughout the first year post-transplant. While functionally adequate neutrophil and platelet counts were achieved in the first six weeks post-transplant, there were defects in hemopoietic progenitor cell function during the first year post-transplant. Although we could detect no influence from acute graft-versus-host disease (GVHD), chronic GVHD adversely affected the growth of both myeloid and erythroid blood progenitor cells.
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421
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Atkinson K, Norrie S, Chan P, Downs K, Biggs J. Lack of correlation between nucleated bone marrow cell dose, marrow CFU-GM dose or marrow CFU-E dose and the rate of HLA-identical sibling marrow engraftment. Br J Haematol 1985; 60:245-51. [PMID: 2860919 DOI: 10.1111/j.1365-2141.1985.tb07410.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
There was no correlation between the rate of marrow engraftment and the number of nucleated bone marrow cells infused into 50 HLA-identical sibling marrow graft recipients with haematological malignancy conditioned with cyclophosphamide and fractionated total body irradiation, and immunosuppressed with either cyclosporin (42 patients) or methotrexate (eight patients). Similarly, there was no correlation between the number of marrow CFU-GM or CFU-e infused into recipients immunosuppressed with cyclosporin. The data show that recipients of HLA-identical sibling marrow allografts conditioned with cyclophosphamide and total body irradiation require less than 3 X 10(8) nucleated bone marrow cells/kg recipient weight to ensure engraftment, and throw doubt on the relevance of measuring committed progenitor cells in the donor marrow to assess the likelihood of subsequent haemopoietic reconstitution after matched sibling transplantation.
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422
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Abstract
A 21-year-old man presented with a 6-year history of episodic localized hyperhidrosis on the back of his hands. Results of the neurologic examination were normal. Profuse sweating of the affected skin was elicited by exercise, raising core temperature, direct heat, and intradermal injections of cholinergic drugs. Examination of the affected skin by electron microscopy and light microscopy with special stains and enzyme methods revealed prominent hyperplasia of otherwise normal eccrine sweat glands and ducts and increased surrounding stromal hyaluronic acid.
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423
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Norrie S, Atkinson K, Chan P, Downs K, Biggs J. Long-term hemopoietic progenitor cell reconstitution after human marrow transplantation. Transplant Proc 1985; 17:1714-6. [PMID: 3885513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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424
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425
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Rao AR, Kagan AR, Potyk D, Nussbaum H, Chan P, Hintz BL, Wollin M, Ryoo MC. Management of gastrointestinal lymphoma. Am J Clin Oncol 1984; 7:213-9. [PMID: 6731344 DOI: 10.1097/00000421-198406000-00005] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A study was made of 65 patients with primary gastrointestinal (GI) lymphoma. The occurrence was 40 (62%) in stomach, 15 (23%) in the small intestine, and 10 (15%) in colorectum. The majority of patients had their histology classified according to Rappaport's classification. Diffuse histiocytic type had the worst prognosis (median survival 13.8 months), and nodular histology had the best prognosis. A modified staging system proposed by Blackledge et al. was used. Patients who had their disease confined to one viscus (Stage I) or with spread to regional lymph nodes (Stage II) had an excellent prognosis, with a 5-year survival of 87 and 67%, respectively. However, those who had distant nodal involvement (Stage III, e.g., para-aortic nodes) or spread to adjacent organs within the abdomen (Stage IV) had worse prognosis, with 5-year survival of 40 and 13%, respectively. In Stage I, radiotherapy alone was as effective as surgical resection. None of the 11 patients treated by radiotherapy alone had perforation or bleeding. The 5-year disease-free survival was 51%.
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426
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Sherratt D, Dyson P, Boocock M, Brown L, Summers D, Stewart G, Chan P. Site-specific recombination in transposition and plasmid stability. COLD SPRING HARBOR SYMPOSIA ON QUANTITATIVE BIOLOGY 1984; 49:227-33. [PMID: 6099237 DOI: 10.1101/sqb.1984.049.01.026] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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427
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Nussbaum H, Kagan AR, Chan P, Rao A, Ryoo M, Hintz B, Gordon J, Miles J, Ulmer R. Carcinoma of the tonsillar area treated with external radiotherapy alone. Am J Clin Oncol 1983; 6:639-44. [PMID: 6416051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Seventy patients with carcinoma of the tonsillar area were treated with radiation therapy alone, all with a minimum follow-up of 3 years. Seventeen patients with stages I and II developed six recurrences and three were salvaged by surgery. Fifty-three patients with stages III and IV developed 24 recurrences, and only three could be salvaged by surgery. We conclude that radiation therapy is adequate for stages I and II carcinoma of the tonsillar area. Local control rate is satisfactory and surgical salvage is acceptable. Patients with advanced disease, Stages III and IV, have a poor survival rate with radiotherapy alone. Local recurrence is high and surgical salvage is inadequate. We have decided to offer selected patients with stages III and IV tonsillar carcinoma planned combined radiotherapy and surgery, in an effort to improve the survival rate.
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428
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Chan P, Shekhter-Levin S, Amato D. The clotting and staining of methylcellulose cultures of human hemopoietic cells. Exp Hematol 1983; 11:709-13. [PMID: 6195007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We describe a technique for clotting, fixing and staining methylcellulose cultures of human hemopoietic progenitor cells. The entire cellular population of a 1-ml culture in a 35-mm plastic petri dish can be recovered and preserved permanently with this method. The technique also provides the opportunity for distinguishing between pure erythroid and mixed colonies, for examining cellular morphology without tediously picking individual colonies, and for terminating cultures on the appropriate day without the necessity of scoring on that same day.
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429
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Koo J, Lam SK, Chan P, Lee NW, Lam P, Wong J, Ong GB. Proximal gastric vagotomy, truncal vagotomy with drainage, and truncal vagotomy with antrectomy for chronic duodenal ulcer. A prospective, randomized controlled trial. Ann Surg 1983; 197:265-71. [PMID: 6338842 PMCID: PMC1352728 DOI: 10.1097/00000658-198303000-00004] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The relative merits of proximal gastric vagotomy (PGV), truncal vagotomy with drainage (TV + D), and truncal vagotomy with antrectomy (TV + A) in the treatment of chronic duodenal ulcer were evaluated and compared in 152 patients in a prospective, randomized and controlled clinical trial. One death occurred after TV + A, resulting in an operative mortality of 2% after gastrectomy and 0.7% for the entire series. After one to six years, stomal and duodenal ulcers proven by endoscopy occurred in eight patients after PGV (16%) and in six patients after TV + D (11.8%); the difference was not statistically significant (p greater than 0.5). One additional patient developed a gastric ulcer nine months after PGV. There was so far no ulcer recurrence after TV + A. Majority (13 patients) of the recurrent ulcers were discovered within three years after surgery. Patients after PGV experienced significantly less unwanted side effects than those after either TV + D or TV + A; particularly, dumping, epigastric fullness, and diarrhea. When the functional status was graded according to a modified Visick system that excluded ulcer recurrence, significantly more PGV patients were placed in the near-perfect grade (82.1%) than TV + A patients (58%). Patients after TV + D fared better than patients after TV + A; but the differences were not significant. However, when ulcer recurrence was included in the functional assessment, the advantage of PGV was lost.
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430
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Chan P. Pulmonary carcinoma and provocative sweat testing. ARCHIVES OF DERMATOLOGY 1983; 119:185. [PMID: 6824350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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431
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van der spiegel J, Lauks I, Chan P, Babic D. The extended gate chemically sensitive field effect transistor as multi-species microprobe. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0250-6874(83)85035-5] [Citation(s) in RCA: 136] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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432
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Dunlop W, Cameron R, Chan P. The 'Go-getters' are checking out. DIMENSIONS IN HEALTH SERVICE 1982; 59:42-3. [PMID: 7075910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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433
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Abstract
A patient had progressive segmental anhidrosis, which proved after extensive neurologic and autonomic workup to be an isolated abnormality. Intradermal acetylcholine produced localized sweating in areas of thermoregulatory anhidrosis five months after the onset of symptoms but failed to do so at two years. These findings are consistent with a preganglionic sympathetic lesion affecting a functionally defined subset of sympathetic cells and/or fibers. The alteration of the sudomotor response to intradermal acetylcholine during the course of the illness suggests that the diagnostic utility of pharmacologic sweat tests may be time dependent, limited to a relatively early period following onset of anhidrosis.
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434
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435
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Kagan AR, Nussbaum H, Rao A, Chan P, Gilbert H, Hintz B, Ryoo M, Miles J, Rice D. The management of carcinoma of the nasal vestibule. HEAD & NECK SURGERY 1981; 4:125-8. [PMID: 7309530 DOI: 10.1002/hed.2890040207] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Forty-two patients with squamous cell carcinoma of the nasal vestibule were reviewed. The patients were treated at either the Southern California Permanente Medical Group or the UCLA Medical Center. Thirty-eight patients (90%) had early lesions and 4 (10%) had late disease (involving the nodes or bone). The following conclusions were formed from this study: (1) Patients without bone destruction or lymph node metastases will do well with either irradiation or surgery. Those with bone destruction or lymph node metastases will do poorly in spite of radical treatment. (2) Early lesions can often be cured with either partial rhinectomy or irradiation. (3) A surgical recurrence following partial rhinectomy can be salvaged with irradiation. (4) A radiation recurrence of an early lesion can be salvaged with surgery. (5) The routine use of total rhinectomy for early carcinoma or radiation failure is unwarranted. (6) Other primary cancers are not uncommon when followup is extended to the 5- to 10-year interval.
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436
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Hintz BL, Kagan AR, Chan P, Gilbert HA, Nussbaum H, Rao AR. Primary irradiation for carcinoma of the breast. CURRENT SURGERY 1981; 38:305-16. [PMID: 7297108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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437
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Hintz BL, Kagan AR, Gilbert HA, Rao AR, Chan P, Nussbaum H. Systemic absorption of conjugated estrogenic cream by the irradiated vagina. Gynecol Oncol 1981; 12:75-82. [PMID: 6268486 DOI: 10.1016/0090-8258(81)90097-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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438
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Rao A, Kagan A, Gilbert H, Hintz B, Nussbaum H, Chan P. Locally advanced endometrial carcinoma. Int J Radiat Oncol Biol Phys 1981. [DOI: 10.1016/0360-3016(81)90311-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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439
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Nussbaum H, Kagan AR, Chan P, Gilbert H, Rao A, Hintz B, Saltz A. Stage I grade III endometrial carcinoma: evaluation of treatment and recommendations for management. Gynecol Oncol 1981; 11:50-5. [PMID: 6781989 DOI: 10.1016/0090-8258(81)90007-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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440
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Abstract
A family including four members with decreased antithrombin III (ATIII) measured by a biological and an immunological method is described. Immunologically measured levels of other coagulation inhibitors were normal. In the antithrombin III deficient family members there was a history of thrombotic disease. Turnover of 125I-antithrombin III in a deficient individual showed the lower plasma levels probably to be due to a deficiency in the rate of synthesis rather than to an increased catabolic rate.
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441
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Hintz BL, Kagan AR, Chan P, Gilbert HA, Nussbaum H, Rao AR, Wollin M. Radiation tolerance of the vaginal mucosa. Int J Radiat Oncol Biol Phys 1980; 6:711-6. [PMID: 7451275 DOI: 10.1016/0360-3016(80)90227-8] [Citation(s) in RCA: 64] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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442
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Bentley PG, Kakkar VV, Scully MF, MacGregor IR, Webb P, Chan P, Jones N. An objective study of alternative methods of heparin administration. Thromb Res 1980; 18:177-87. [PMID: 7404497 DOI: 10.1016/0049-3848(80)90182-6] [Citation(s) in RCA: 96] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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443
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Hintz B, Kagan A, Chan P, Gilbert H, Nussbaum H, Rao A, Wollin M. Radiation tolerance of the vaginal mucosa. Int J Radiat Oncol Biol Phys 1979. [DOI: 10.1016/0360-3016(79)90525-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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444
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Chan P, White SW, Pierson DL, Rodman OG. Trichilemmoma. THE JOURNAL OF DERMATOLOGIC SURGERY AND ONCOLOGY 1979; 5:58-9. [PMID: 759462 DOI: 10.1111/j.1524-4725.1979.tb00605.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Trichilemmoma is an uncommon cutaneous neoplasm that originates in the outer hair sheath. We are reporting two cases, one of lobular pattern, the other a massing of cells of the follicular infundibulum. In each case, the clinical appearance was nonspecific and the mistaken clinical diagnosis was basal-cell carcinoma.
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445
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Gilbert H, Apuzzo M, Marshall L, Kagan AR, Crue B, Wagner J, Fuchs K, Rush J, Rao A, Nussbaum H, Chan P. Neoplastic epidural spinal cord compression. A current perspective. JAMA 1978; 240:2771-3. [PMID: 713019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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446
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Gilbert HA, Logan JL, Kagan AR, Friedman HA, Cove JK, Fox M, Muldoon TM, Lonni YW, Rowe JH, Cooper JF, Nussbaum H, Chan P, Rao A, Starr A. The natural history of papillary transitional cell carcinoma of the bladder and its treatment in an unselected population on the basis of histologic grading. J Urol 1978; 119:488-92. [PMID: 650752 DOI: 10.1016/s0022-5347(17)57526-6] [Citation(s) in RCA: 109] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Between 1950 and 1965, 365 patients were treated for transitional cancer of the bladder at our hospitals. A retrospective study was done, using clinical records and a histopathologic review to determine the long-term natural history of this population when treated conservatively. The natural history of 3 separate patient populations was discovered, based solely on the grading of the transurethrally resected fragments. Based on the grade on initial presentation these patients were divided into grades I, II and III. Of the patients 5 per cent in grade I, 16 per cent in grade II, 28 to 35 per cent in grade III not involving muscle and 83 per cent in grade III involving muscle died of bladder cancer. Ninety-seven patients (26 per cent) died of bladder cancer, 110 (31 per cent) died of other causes and 158 (43 per cent) have been alive more than 5 years (104 more than 10 years). Grade I tumors that progressed to a higher grade did so within 2 years of the initial diagnosis. Of the bladder cancer deaths 83 per cent occurred within 2 years of the initial diagnosis. Of 64 patients dying more than 5 years after presentation only 7 died of bladder cancer.
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447
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Gilbert HA, Kagan AR, Miles J, Flores L, Nussbaum H, Rao AR, Chan P. The usefulness of pretreatment DNCB in 85 patients with squamous cell carcinoma of the upper aerodigestive tract. J Surg Oncol 1978; 10:73-7. [PMID: 628221 DOI: 10.1002/jso.2930100112] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Pretreatment DNCB skin testing and absolute lymphocyte counts were studied in 85 consecutive head and neck cancer patients. All patients were treated primarily with radiation therapy alone or combined radiation plus surgery. The results of DNCB testing and absolute lymphocyte counts were not sufficiently predictive of outcome, (no evidence of disease after 2 years) to be useful in making treatment decisions on an individual patient. This applied to the good prognosis (T1, T2, N0-N3) and poor prognosis (T3, T4, N0-N3) groups.
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448
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Gilbert HA, Kagan AR, Nussbaum H, Rao AR, Satzman J, Chan P, Allen B, Forsythe A. Evaluation of radiation therapy for bone metastases: pain relief and quality of life. AJR Am J Roentgenol 1977; 129:1095-6. [PMID: 74204 DOI: 10.2214/ajr.129.6.1095] [Citation(s) in RCA: 136] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The records of 158 patients irradiated for bone metastases were reviewed to evaluate the effectiveness of pain relief and to judge the effect of treatment on overall quality of life. Within 3 months 73% of the sites treated had pain relief, with 55%-65% having sustained relief up to 1 year or death. Of patients surviving more than 3 months, 63% maintained a satisfactory quality of life and were able to take care of most personal needs. The median survival of all patients was 1 year from initial treatment for bone metastasis. Radiation dose and the primary tumor site do not seem to be significant prognostic factors for initial pain relief or quality of life.
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449
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Shapiro R, Gilbert H, Skeel RT, Kagan AR, Jacobs M, Senyszyn J, Chan P, Nussbaum H. The management of extramedullary disease in acute leukemia with therapeutic radiations. REVISTA INTERAMERICANA DE RADIOLOGIA 1977; 2:191-7. [PMID: 271330] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The authors reviewed 181 patients who received local radiation therapy for the prevention or control of extramedullary disease resulting from acute leukemia. 126 had acute lymphocytic leukemia and 55 had acute granulocytic leukemia. They were treated over a 18-year period of time with different forms of chemotherapy. Most had not received prophylactic CNS radiation therapy. Patients were evaluated for local control until death or hematologic relapse intervened. More than 80% of patients with clinical ALL meningeal leukemia had a successful response to doses over 1000 rads. This same response was not apparent in AML. More than 80% of clinical non-CNS extra medullary leukemia was controlled with doses of 600 rads or greater. Only one patient with extra-medullary relapse is still alive. The authors feel that lower preventative doses of radiation to the CNS are compatible with similar control rates, based on their own data and other suggestive data.
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450
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Kagan AR, Gilbert HA, Nussbaum H, Chan P. The meaning of metastatic lymphadenopathy, tumor size and histology as prognostic factors on survival. REVISTA INTERAMERICANA DE RADIOLOGIA 1977; 2:115-21. [PMID: 897484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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