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Biomedical subjects

K W Suh

Publications and source records attributed to K W Suh.

18 recordsLinked to original sources
PubMed1999

Treatment of liver metastases from colon carcinoma with autologous tumor vaccine expressing granulocyte-macrophage colony-stimulating factor.

BACKGROUND AND OBJECTIVES: In preclinical studies, tumor cells genetically altered to secrete granulocyte-macrophage colony-stimulating factor (GM-CSF) can generate systemic antitumor immunity. Clinically relevant immunotherapeutic approaches for the treatment of colorectal cancer should address efficacy within the liver, a common site of metastatic disease. We investigated the effect of irradiated colon cancer cells engineered to produce GM-CSF on protecting from and treating established liver metastases. METHODS: Using a model of liver metastasis by intrahepatic injection of CT-26 murine colon carcinoma cells in syngeneic BALB/c mice, GM-CSF-producing irradiated cells were given as an intradermal vaccine either 14 days prior to hepatic challenge or in animals with early established tumor (days 5 and 10). The presence of tumor, tumor volume, and survival were endpoint determinants. RESULTS: Animals receiving GM-CSF-producing vaccination demonstrated significant protection from subsequent hepatic challenge of viable tumor cells, even at the highest challenge doses. In animals with early established tumors, a significant response was seen with prolongation in survival. CONCLUSIONS: We conclude that GM-CSF autologous tumor vaccination was effective for the treatment of hepatic colorectal metastases in this murine model. These findings provide support for immunotherapeutic approaches for metastatic liver cancer.

Animals↗
PubMed1999

Gene gun-mediated DNA vaccination induces antitumor immunity against human papillomavirus type 16 E7-expressing murine tumor metastases in the liver and lungs.

DNA vaccination has emerged as an attractive approach for tumor immunotherapy. The aim of this study was to evaluate the potency of DNA vaccines in preventing and treating the liver and lung metastases of a human papillomavirus-16 (HPV-16) E7-expressing murine tumor (TC-1). We used the gene gun method to vaccinate C57BL/6 mice intradermally with DNA vaccines containing the HPV-16 E7 gene, the E7 gene linked to the sorting signals of the lysosome-associated membrane protein-1 (Sig/E7/ LAMP-1), or the 'empty' plasmid vector. The in vivo antitumor immunity was analyzed in both tumor prevention and tumor regression experiments. In addition, cytotoxic T lymphocyte (CTL) assays, enzyme-linked immunospot assay and enzyme-linked immunoabsorbent assay were used to assess the E7-specific T cell-mediated and humoral immunity. Mice vaccinated with Sig/E7/LAMP-1 DNA generated the strongest E7-specific CTL activities, the highest numbers of E7-specific CD8+ cell precursors and the highest titers of E7-specific antibodies. While both E7 DNA and Sig/E7/LAMP-1 DNA generated potent antitumor immunity in the liver and lung metastases models, the Sig/E7/LAMP-1 DNA was more potent under stringent conditions. DNA vaccination with E7-expressing plasmids was effective in controlling liver and lung metastases of an E7-expressing murine tumor. Our data suggest that antigen-specific DNA vaccination can potentially be applied to control liver and lung metastases of tumors with defined tumor-specific antigens.

Animals↗
PubMed1998

Radiomorphometry and biomechanical assessment of recombinant human bone morphogenetic protein 2 and polymer in rabbit radius ostectomy model.

The study objective was to determine the mechanical integrity and radiopacity of regenerated bone within critical-sized defects (CSDs) in radii of rabbits using recombinant human bone morphogenetic protein 2 (rhBMP-2) with a porous, biodegradable poly(D,L-lactic acid) (PDLLA) carrier (designated PLA). Twenty millimeter, unilateral radial ostectomies were created in 96 skeletally mature New Zealand white rabbits. The rabbits were randomly assigned to six treatment groups with two euthanasia periods. Treatment groups included unfilled defect (n = 8), segmental autograft (n = 8), PLA + 0 microg rhBMP-2 (n = 8), PLA + 17 microg rhBMP-2 (n = 8), PLA + 35 microg rhBMP-2 (n = 8), and PLA + 70 microg rhBMP-2 (n = 8). The radiopacity was significantly greater for the 35- and 70-microg rhBMP-2 groups at 4 weeks compared to unfilled controls, PLA only, and 17-microg rhBMP-2 groups and equivalent to the autograft. At 8 weeks all groups receiving rhBMP-2 were equivalent to the autograft and significantly greater than unfilled defects and PLA alone. Similarly, the biomechanical analysis indicated significantly greater torque at failure for the 35-microg rhBMP-2 group compared to all other groups at 4 weeks. By 8 weeks all groups receiving rhBMP-2 and autograft had significantly greater torque than unfilled controls and PLA alone. These radiomorphometric and biomechanical results indicate PLA may be a suitable carrier for rhBMP-2 used for skeletal regeneration.

Animals↗
PubMed1993

Diagnosis of cervical tuberculous lymphadenitis with fine needle aspiration biopsy and cytologic examination under ultrasonographic guides.

The efficacy of the fine needle aspiration biopsy and cytological examination (FNABC) under ultrasonographic (US) guides for the diagnosis of cervical tuberculous lymphadenitis was assessed. In one hundred and one patients with a neck mass or masses, tuberculous lymphadenitis has been proved by FNABC. US disclosed the physical characteristics of the masses: All the cases that involved two or more lymph nodes were multiple lesions. Eighty lesions (79.1%) were multiregional, and in 19 cases (18.8%), bilateral neck was involved. The posterior triangle of the neck was the most prevalent site (N = 69, 68.3%). Ninety two cases (90.9%) were hypoechoic lesions and 9 (9.1%) showed mixed echo patterns. There was no hyperechoic lesion (p < 0.001). The sensitivity of FNABC was 77.2% and the specificity was 99.0%. The diagnostic accuracy was 85.0%. There was no complication during the procedure. FNABC for the diagnosis of cervical tuberculous lymphadenitis is a safe, convenient procedure and has a relatively high specificity. The limitation of FNABC, the low sensitivity, seemed to be compensated by US examinations.

Biopsy, Needle↗
PubMed1993

Roux-en-Y end-to-side esophagojejunostomy with stapler after total gastrectomy.

One hundred gastric cancer patients who underwent total gastrectomy and Roux-en-Y, end-to-side esophagojejunostomy by using stapling devices were analyzed with regard to their operative results. The median time required for the anastomosis was 18 minutes (range of 15 to 45 minutes). A cartridge of 25 mm in diameter was preferred (85% of 25 mm vs. 15% of 28 mm). In 92 patients, procedures were uneventful. Intraoperative problems happened in 8 patients: Two misfirings of stapler due to mechanical problems, in 6 patients, doughnut tissues were incomplete. Mechanical problems were solved by a change of the stapler and for incomplete doughnut tissues, anastomosis was simply reinforced (2 cases) or reanastomosed with restaplings (4 cases). Anastomotic leakage occurred in 2 patients but it was seen only in radiological studies. During the follow up period, two cases of anastomotic stricture were found and they were treated with endoscopic dilatations. There was no operative mortality nor other complication. In addition, routine use of the Levin tube after total gastrectomy was appraised by comparing postoperative courses. Twenty patients were randomly divided into two groups; for 10 patients the Levin tube was removed at the recovery room and for another 10 patients the Levin tube was indwelled until peristalsis returned. Timing of the tube removal did not affect the duration of the hospital stay and starting day of oral intake. We think that the stapler, when properly used, can facilitate the esophagojejunostomy safely and routine use of the Levin tube after total gastrectomy may be unnecessary.

Adult↗
PubMed1992

Congenital absence of gallbladder.

Nine surgically proven congenital absence of gallbladder (CAGB) cases were reviewed. All of them had one or more kinds of biliary symptom. Tests such as abdominal ultrasonography, intravenous or oral cholecystography and even endoscopic retrograde cholangiography not only failed to predict CAGB but misleadingly indicated other similar conditions. Only the abdominal computed tomography (CT), performed on one patient, enabled the accurate diagnosis of CAGB. All the patients underwent abdominal exploration, and CAGB was confirmed by the meticulous dissection of the entire extrahepatic biliary tree and the operative cholangiography. Five patients had concomitant biliary pathologies responsible for their symptoms, but four patients had isolated CAGB. CAGB is a rarely encountered condition for a clinician, but extensive diagnostic work-ups including abdominal CT should be performed in all situations where CAGB is suspected. Thus unnecessary exploration can be avoided in the isolated CAGB case.

Bile Duct Diseases↗
PubMed1978

Symptoms, findings, and methods of diagnosis in patients with acoustic neuroma.

The records of 225 patients with surgically documented acoustic neuromas seen at the Mayo Clinic between 1966 and 1976 were studied. Included in this group were 4 patients who had von Recklinghausen's disease with bilateral ear involvement, 7 patients with recurrence of acoustic neuroma, and 8 patients who were referred because of recurrent acoustic neuroma. Symptoms, clinical findings, and results of audiologic, vestibular, and roentgenographic studies were analyzed. Nine patients had a history of sudden onset of hearing loss, and 11 had a history of vertigo. A correlation between the size of the lesion and the symptoms, physical findings, and roentgenographic accuracy was made in an attempt to gain further knowledge of the natural course of the pathologic processes involved.

Adolescent↗
PubMed1977

Inverting papilloma of the nose and paranasal sinuses.

Inverting papilloma of the nose and paranasal sinuses has been classified as a true neoplasm by most authors. It is distinct from the ordinary nasal polyps in that it has a different cause, different histologic features, a higher recurrence rate, and is occasionally associated with carcinoma. This study includes 57 patients seen over a 30-year period who had inverting papilloma and for whom the history, clinical and radiologic findings, treatment methods, pathologic sections, and recurrences were analyzed. Features associated with higher recurrence rate were epithelial atypia and extent of lesions. Females showed higher recurrence rates than males. External approaches (lateral rhinotomy) reduced recurrence remarkably compared with transnasal removal (13 percent versus 45 percent). Four patients had associated carcinoma with inverting papilloma, and more extensive operations were perfomred in these cases; one patient died of the tumor. Radical aggressive treatment and careful follow-up are advocated because of the higher recurrence rate after inadequate removal and because of possible malignant transformation.

Adolescent↗
PubMedDate not supplied

Neurilemmomas of the cervical vagus nerve.

Four patients were seen with neurilemmoma which arose in the cervical vagus nerve. Three tumors arose in the upper third of the lateral neck, and the remaining one in the lower third. Lateral neck mass was a prominent symptom in 3 patients, and parapharyngeal mass in the remaining one. The parapharyngeal mass bulged into the oropharynx in the tonsillar and retrotonsillar region and caused mild swallowing difficulty. Complete surgical extirpation by means of intracapsular enucleation was possible in all 4 patients. All patients remained free of disease for periods ranging from 15 to 75 months following surgery. It would appear that an intracapsular enucleation may be advisable for clearance of this kind of tumor.

Adult↗
PubMedDate not supplied

Cartilage-shaving procedure for the control of tracheal cartilage invasion by thyroid carcinoma.

This study was carried out to ascertain whether the cartilage-shaving procedure is appropriate to control thyroid carcinoma with tracheal cartilage invasion. Of 432 thyroid carcinoma patients treated between 1979 and 1988, 16 had tracheal cartilage invasion only. This patient population was made up of 3 men and 13 women, with a mean age of 55.8 years. Fourteen were diagnosed histologically as having papillary carcinoma and the remaining two as having follicular carcinoma. Cartilage shaving was the primary treatment in all the patients, and subsequent radioactive iodine (131I) or external-beam radiotherapy was administered to control any possible residual disease. Lifelong thyroid hormone replacement was instituted in all patients, and the follow-up period averaged 70.7 months. Only four of the 16 patients remained disease free; the disease was not controlled in the other 12, and seven of this latter group eventually died of their disease. We feel that a more extensive resection procedure than cartilage shaving should be considered, even in patients with superficial tracheal invasion, to increase the disease-free survival rate.

Adult↗
PubMedDate not supplied

Comparative study using computed tomographic thin-section zoom reconstructions and anatomic macrosections of the temporal lobe.

Thin-section (1.5 mm) high-spatial-resolution computed tomography (CT) in combination with computerized high-resolution image reconstruction is an effective, noninvasive means of studying patients with a variety of temporal bone abnormalities. To determine what degree of definition and anatomic accuracy could currently be obtained by using these techniques, we performed thin-section CT and high-resolution image reconstruction with use of two fresh-frozen cadaver head specimens. We then compared these images with the actual anatomic macrosections subsequently obtained from the specimens. We concluded that high-resolution CT scans of temporal bone can produce accurate, highly detailed, diagnostic images of the internal auditory canal, vestibule, cochlea, vestibular aqueduct, semicircular canals, and middle ear space.

Cadaver↗
PubMedDate not supplied

Surgically correctable causes of sleep apnea syndrome.

This report presents six cases of obstructive sleep apnea associated with discrete anatomic abnormalities of the upper airway tract. All patients were relieved of their sleep apnea by surgical correction of the airway obstruction, and therefore permanent tracheotomy was avoided. The obstructive causative factors were nasal septal deformity, adenoidal hypertrophy, nasopharyngeal stenosis, lingual cyst, lingual tonsillar hypertrophy, and laryngeal cyst. The last-named four conditions have not previously been reported as correctable causes of sleep apnea.

Adolescent↗
PubMedDate not supplied

Obliteration of vestibular and cochlear aqueducts in animals.

The right vestibular aqueduct was obliterated in guinea pigs, chinchillas, and monkeys, and the right cochlear aqueduct and both the right vestibular and right cochlear aqueducts were obliterated in guinea pigs and chinchilas. Changes in auditory acuity were monitored by determining averaged temporal-response thresholds, and temporal-bone histologic studies were performed. Obliteration of the vestibular aqueduct or both the vestibular and cochlear aqueducts consistently produced endolymphatic hydrops in guinea pigs. In these animals, the auditory acuity gradually deteriorated. The low tones consistently were depressed more than the high tones. The auditory changes corresponded to the severity of endolymphatic hydrops. On the other hand, no significant histologic or audiometric changes were demonstrated in monkeys after obliteration of the vestibular aqueduct or in chinchillas after obliteration of the vestibular aqueduct or of both the vestibular and cochlear aqueducts. No significant histologic or audiometric changes were demonstrated in guinea pigs and chinchillas after obliteration of the cochlear aqueduct.

Animals↗