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Query: UMLS:C0242379 (lung cancer)
 71,905 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Chronic inhalation of diesel exhaust (DE) causes lung tumors in rats; epidemiologic studies suggest that DE may be a potential human carcinogen. We compared the DE unit risks for human lung cancer as derived by Smith and Stayner (1991), Hattis and Silver (1992), Pepelko and Chen (1993), California Environmental Protection Agency, Office of Environmental Health Hazard Assessment (1994), and the U.S. Environmental Protection Agency (USEPA) (1994). All five sets of authors used identical rat bioassay data (Mauderly et al., 1987). Although different in detail, the dose-response models were uniformly linear and nonthreshold. However, each set of authors chose a different approach in relating the rat data to DE unit risk in humans. The predicted unit risks for continuous lifetime exposure to 1 microgram/m3 DE differed by an 80-fold factor between the highest [8 x 10(-4), Hattis and Silver] and the lowest [0.1 x 10(-4), Pepelko and Chen]. The choice of dose-input parameters and how each group treated particle overload were the major factors affecting the different risk estimates. Several unanswered questions undermine the current use of the rat bioassay for DE risk assessment: (1) Differences in emission products and exposure scenarios between laboratory studies and human exposure, (2) occurrence of an apparent threshold in the rat-lung-tumor response, (3) uncertainty as to the appropriate lung-dose metric and its low-dose extrapolation, (4) the role of lung overload, and (5) the cause of species-specific biological susceptibility.
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PMID:Analysis of diesel-exhaust unit-risk estimates derived from animal bioassays. 892 44

Disease stage is the most important factor in determining prognosis and treatment of lung cancer. Staging of lung cancer is complicated by presentation of multiple pulmonary malignant lesions with a similar histology. It is a dilemma to decide if these lesions are synchronous primaries arising from different malignant clones or metastases from a single clone. Lung cancer is associated with multiple genetic abnormalities including mutations of K-ras and p53, which are believed to occur prior to onset of metastasis. To determine the clonal origin of multiple pulmonary malginant nodules, we analyzed point-mutations of K-ras and p53 by microdissection, polymerase chain reactions (PCR), nonradioisotopic single-strand conformation polymorphism (SSCP) analysis, and DNA sequencing. Each pulmonary lesion was microdissected from paraffin slides. Genomic DNA was amplified by two sequential PCRs followed by electrophoresis in a minigel and silver staining. Deoxyribonucleic acid sequencing was performed if necessary to confirm a mutation found upon SSCP analysis. Applying this molecular approach, we were able to differentiate the clonal origins of multiple malignant nodules of the lung as exemplified by the two cases presented.
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PMID:Clonal origin of multiple lung cancers: K-ras and p53 mutations determined by nonradioisotopic single-strand conformation polymorphism analysis. 936 Aug 38

In order to diagnose lung cancer at gene level, bronchial biopsy specimens from lung cancer patients, who were diagnosed by pathologic method using biopsy specimens from the same site, were used for detection of p53 gene mutation by polymerase chain reaction (PCR)-single strand conformation polymorphism (SSCP)-silver staining method. 15 of 25 (60%) specimens were found to be positive. In 10 small cell lung cancer specimens, 7 were positive; in 15 non-small lung cancer specimens, 8 were positive. These results coincided with those of other reports using surgical specimens and sequencing method. Clinical analysis showed no correlation between SSCP positivity and the patients' clinical data such as age, sex, smoking habit, stage of tumor at the time of diagnosis. It is concluded that a small piece of bronchial biopsy specimen could be used to detect p53 gene mutation instead of surgical specimens and this method might be used as an adjunct to cancer screening or for a gene diagnosis prior to gene therapy. In comparison with the routine radionuclide labelled method, silver staining method has the advantage of being simple, quick, economic, safe and convenient for clinical use.
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PMID:[Detection of p53 gene mutation in bronchial biopsy samples from lung cancer patients with polymerase chain reaction-single strand conformation polymorphism-silver staining method]. 959 39

Paraffin-embedded asbestos-related lung cancer tissue of ten cases was analyzed with polymerase chain reaction-single strand conformation polymorphism (PCR-SSCP) to study its genetic mutation of exon 5, 7 and 8 of anti-oncogene p53 by silver stain. Results showed that fragment of exon 7 or 8 of p53 gene in four cases was positive in silver-staining analysis of PCR-SSCP. Exon 7 or 8 fragments of p53 gene was detected positive for mutation in seven of these ten cases with autoradiographic analysis of PCR-SSCP. No exon 5 fragment was found positive for mutation in these ten cases with both methods. Agreement between results of silver staining and those of autoradiographic PCR-SSCP was 60%. Hence, autoradiographic method could be replaced by silver staining, a simpler and more sensitive one, in PCR-SSCP to study gene mutation of asbestosrelated lung cancer.
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PMID:[Detection of p53 gene mutation in paraffin-embedded asbestos-related lung cancer tissue]. 981 77

Mining activities in the former German Democratic Republic were documented as early as 1168 in the ore mountains (Erzgebirge) of Saxony. Silver, bismuth, cobalt, nickel and tungsten were mined from then up to the end of the 19th century. After the Second World War, the Soviet Occupation Authorities reopened the old silver mines in Saxony to mine uranium for the Soviet nuclear industry. About 400, 000 workers produced a total of 220,000 tons of uranium during the years 1946 to 1990. After the reunification of Germany, the archive of the Institute of Pathology of the mining area was opened for research. It contains protocols of 28,975 autopsy cases and about 400,000 slides collected from 1957 to 1992, about 66,000 tissue blocks, and 238 whole lungs. From the autopsy cases, 17,466 could be identified as workers of the uranium mining company. The remainder of the cases were in the population of the mining area. A comparison of the frequencies of malignancies of male workers older than 15 years with those of the population of the mining area for the years 1957 to 1989 demonstrates a significantly higher percentage of lung cancer among the uranium miners. There was no significant difference for other solid cancers and leukemias.
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PMID:German uranium miner study--historical background and available histopathological material. 1056 36

K-ras oncogene mutations were detected with PCR-SSCP-DNA direct sequencing technique in 40 cases of lung cancer. The result of PCR-SSCP silver staining indicated that the mutational rate was 30% (12/40), all mutations were observed in lung adenocarcinoma and its mutational rate was 44% (12/27). The result of DNA direct sequencing showed that 11 of the 12 positive samples screened by PCR-SSCP had mutation and 90% of K-ras mutations were in codon 12. The mutation was mainly G-->T transversion and G-->A transition. The study suggested that SSCP silver staining analysis is very useful in screening large amount of samples simultaneously and PCR-SSCP-DNA direct sequencing method is quite efficient for the detection of oncogene mutation.
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PMID:[Detection of K-ras oncogene mutations in human lung cancer by PCR-SSCP-DNA direct sequencing]. 1068 30

After the International Agency for Research on Cancer (IARC), Lyon classified crystalline silica within Class I, i.e. substances for which there is clear evidence of carcinogenicity to man, the need was felt for further studies to quantify the concentration levels and ensuing risks the general population is exposed to. Crystalline silica is a well-known pollutant which has been largely dealt with in literature as far as occupational exposure is concerned. On the contrary, the data resulting from environmental studies are scarce and usually inadequate, hence the importance of determining the levels of quartz (the most common form of crystalline silica) in the respirable fraction of the airborne particulate in urban areas in a reliable way. This paper is the continuation of a previous study which reported data on quartz concentrations in PM10 collected in an urban site of the metropolitan area of Rome in 1994 (the first year PM10 started to be collected). Measurements had been made with a new procedure that involved the use of X-ray diffractometry and silver filters, permitting the reproducible quantification of small amounts of quartz in the urban atmosphere. In the present work we report the mean daily quartz concentrations in PM10 collected for four weeks representative of the four seasons, from May 1997 to February 1998, in the same sampling site as in 1994. We then compare the two sets of data; in addition, we report preliminary estimates of the potential risk of contracting lung cancer for the general population.
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PMID:[Seasonal levels of respirable quartz measured at a site in the metropolitan area of Rome in 1997-8]. 1072 Dec 13

Strategies for identifying patients at high risk of chemotherapy-induced neutropenia are reviewed. Among lung cancer patients, a 24% rate of neutropenia has been reported. This rate is below the 40% threshold recommended by the American Society of Clinical Oncology (ASCO) for the prophylactic use of colony-stimulating factors. Risk factors for febrile neutropenia in patients receiving adjuvant chemotherapy for breast cancer include older age, fluorouracil-containing regimens, bone marrow involvement or prior myelosuppressive therapy, and concomitant or prior radiation therapy. According to the Silber predictive model, factors suggesting a high risk of hospitalization for febrile neutropenia include the absolute neutrophil count during the neutrophil nadir in cycle 1 of chemotherapy. Patients with non-Hodgkin's lymphoma (NHL) are at risk of febrile neutropenia and fall on the edge of the ASCO guidelines. Risk factors in NHL patients include certain combination chemotherapy regimens, an albumin concentration of > 3.5 g/dL, an above-normal lactate dehydrogenase concentration, bone marrow involvement, age of > 65 years, and renal disease. Patients can be stratified into low-risk and high-risk categories for febrile neutropenia. High risk is associated with a duration of neutropenia of more than seven days and concomitant medical conditions, such as hypotension and diarrhea. A majority of low-risk patients can be managed as outpatients. Prophylactic use of colony-stimulating factors is currently believed not to be cost-effective if the frequency of febrile neutropenia is less than about 20% for a given treatment regimen. Patients at higher risk of febrile neutropenia in association with cancer chemotherapy may include the elderly and those with specific malignancies and prior neutropenic events, as well as those receiving combination chemotherapy and radiation therapy.
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PMID:Identification of cancer patients at high risk of febrile neutropenia. 1216 33

Cervical cancer accounts for about 10% of all newly diagnosed cancers in women worldwide. The association between HPV infection and cervical neoplasia appears to be stronger than the association between smoking and lung cancer. At least 20 oncogenic HPV types have been identified in > 95% of preinvasive and invasive cervical cancers, HPV type 16 being the most common. HPV detection is important to identify those patients who may be at high risk for the development of cervical neoplasia. Detection techniques include Hybrid Capture (Digene, Silver Springs, MD) and PCR. Viral integration appears to be one of the necessary steps in malignant transformation. Recently, some of the repeated chromosomal alterations and patterns of integration sites have been identified in cervical cancer specimens. The low rate of HPV-negative cancers implies an effective HPV vaccine might have the ability to eradicate cervical cancer worldwide.
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PMID:Human papillomavirus and cervical neoplasia. 1244 41

A 65-year-old female smoker was admitted due to haemoptysis and a pulmonary infiltrate in the right lower lung lobe. Tumour was suspected, but there was also a history of 2 years spent in Arizona, known to be endemic for the dimorphic fungus Coccidioides immitis. IgG antibodies and airway culture for C. immitis were negative, and surgery was performed for suspected lung cancer. No malignancy was detected at histopathological investigation, but typical coccidioidal spherulae were observed by silver stain. Coccidioidoma may be a differential diagnosis to malignant tumour in individuals visiting endemic areas.
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PMID:Coccidioidomycosis mimicking lung cancer. 1473


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