Conversation with David Deitch.
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Community Health Services↗
Biomedical subjects
D Deitch
Publications and source records attributed to D Deitch.
An origin of presumptive preneoplastic foci and nodules from hepatocytes in chemical carcinogenesis in rat liver.
The sites and times of appearance of preneoplastic foci in rat liver acinus during the first 11 days after initiation with diethylnitrosamine and promotion with 2-acetylaminofluorene plus partial hepatectomy was observed in three separate experiments. Foci appeared as alterations of hepatocytes followed by focal proliferation in each of the three zones before any ductular epithelial cell ('oval cell') proliferation. The dissociation between foci and 'oval cell proliferation' is strong evidence against a role of the latter in generating preneoplastic hepatocytes in hepatocellular carcinogenesis.
Animals↗
Short-term culture of exfoliated cells from the urine of patients with bladder tumors.
This report concerns the short-term culture of urothelial cells from the urine sediment of over 100 patients with bladder tumors. Primary cell outgrowth was obtained in approximately 60% of the cultures initiated. Culture outcome was not related to tumor grade, patient age, or volume of the urine sample. Around 85% of the proliferating cultures were successfully transferred into multi-compartment chamber/slides. These results suggest that the culture system may be a useful tool for the study of urothelial cells using patient material obtained by non-invasive means.
Aged↗
Concurrent mutations of coding and regulatory sequences of the Ha-ras gene in urinary bladder carcinomas.
This report concerns the study of Ha-ras gene mutations and ras p21 expression in primary tumors of the urinary bladder. Polymerase chain reaction-based techniques and computerized image analysis were used. The data obtained were related to tumor grade, DNA ploidy, and tumor invasion. A point mutation (G-->T) at Ha-ras codon 12 was found in 30 of 67 tumors. The mutation frequency was greater in grade III (65%) than in grade II (44%) tumors; no mutations were observed in grade I tumors. The mutation was observed more often in aneuploid (58%) than in diploid (28%) tumors. No other substitution at codon 12 was seen and no codon 61 mutation was detected. The tumors were also tested for the A-->G mutation at position 2719 of Ha-ras intron D. Concurrent codon 12 and intron D mutations were identified in seven high-grade aneuploid tumors; six were invasive. The levels of the ras gene product p21 were approximately 10 times higher in tumors with intron D mutation than in those without. These findings confirm on human bladder tumors the observations of the effect of synchronous exon-intron mutations reported on the bladder cancer cell line T24. Our results are the first demonstration of Ha-ras intron D alterations in human tumor tissues and suggest that concurrent mutations at codon 12 and intron D of this gene within the same tumor may contribute to the aggressive behavior of human bladder carcinomas.
Adult↗
Variability in DNA measurements in multiple tumor samples of human colonic carcinoma.
The DNA ploidy and cell-cycle distribution of three separate fresh tissue samples of 60 colorectal adenocarcinomas were analyzed by flow cytometry. DNA ploidy was concordant among the three samples in 38 cases (63.3%). In the remaining 22 cases (36.6%), the DNA histograms of two of the three multiple samples were similar; however, the ploidy of the third sample was discordant. No relationship was observed between Dukes' stage and histologic grade with concordance or discordance among samples. Thus, in about one third of the colonic carcinomas, a single sample showing either a diploid or diploid-cycling DNA histogram would not detect aneuploid DNA patterns. Comparison of scrapes and fine-needle aspirates of tumors as alternative sampling methods of tumors for DNA ploidy analysis indicated a strong association with the tumor ploidy (84% and 96%, respectively) only when the ploidy of the multiple samples was concordant. In about 25% of the cases, tumor scrapes and fine-needle aspirates did not correlate with the "most abnormal" ploidy observed in one of the three tissue samples. The data suggest that single or even double tissue samples may not show aneuploid DNA patterns in a substantial proportion of colorectal cancers.
Adenocarcinoma↗
Protein expression in relation to the cell cycle of exponentially growing human prostatic epithelial cells.
This report concerns the study of the relationship between protein expression and the cell cycle in exponentially proliferating benign and malignant human prostate epithelial cells in short-term cultures. Multiparameter flow cytometric measurements were performed to correlate the expression of prostate-specific acid phosphatase, epithelial membrane antigen and epitectin with cell cycle progression. The expression of the three proteins was heterogeneous in G1 cells. The early post-mitotic cells exhibited the lowest levels when compared with late G1 cells, wherein the expression was many times greater. There was no further increase as the cells progressed through S and G2 + M. These findings, corroborating prior observations in other systems, suggest the possibility that the levels of the proteins studied increase during the G1 phase of the cell cycle and drop during or immediately after cytokinesis. As an alternate explanation, the heterogeneity of protein expression characteristic of G1 cells may be due, at least in part, to an asymmetric apportionment of cell constituents at mitosis.
Acid Phosphatase↗
Aggressive subtypes of human colorectal tumors frequently exhibit amplification of the c-myc gene.
Expression of the c-myc gene is often elevated in human colorectal tumors, but reported amplification of the locus is rare. Here we demonstrate that modest amplification of c-myc is frequently found in aggressive subtypes of colorectal cancer. Careful quantitation of c-myc copy number has shown amplification in 53.8% (7/13) mucinous tumors, 42.3% (3/7) poorly differentiated tumors and a single poorly differentiated APUD tumor. This contrasts with amplification in 6.9% (2/29) moderately to well differentiated tumors, a value which is in agreement with that in previously published reports. Such changes in gene copy number may represent an important aspect of the genomic alterations which accumulate during the development of colorectal tumors.
Blotting, Southern↗
Ha-ras gene codon 12 mutation and DNA ploidy in urinary bladder carcinoma.
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Codon↗
Predictive value of DNA measurements in bladder washings. Comparison of flow cytometry, image cytophotometry, and cytology in patients with a past history of urothelial tumors.
Comparative DNA ploidy measurements were carried out by flow cytometry and by image analysis on cells in 71 bladder washing specimens from 50 patients with past histories of bladder tumors. Among the specimens classified as diploid or questionable by flow cytometry, 14 showed the presence of aneuploid DNA values documented by image analysis. In 18 of the 50 patients, recurrent tumors were observed during a relatively brief period of follow-up. In 15 of them the DNA pattern was aneuploid and in three it was questionable. In nine of the 15 patients, both methods of DNA analysis disclosed aneuploidy, but in six patients aneuploidy was detected by image analysis only. A combination of DNA aneuploidy, whether observed by flow cytometry, image analysis, or both, and of positive or suspicious urine cytology is highly predictive of recurrence of high grade bladder tumors. Image analysis of DNA content in bladder washings adds information of clinical value above and beyond that obtained by flow cytometry.
Aged↗
Expression of ras oncogene p21 protein in relation to regional spread of human breast carcinomas.
The oncogenes most frequently detected in human tumors belong to the ras gene family (Ha-ras, Ki-ras, and N-ras). These genes encode a group of closely related 21,000 dalton proteins termed p21. An immunohistochemical study of ras p21 expression was carried out on paraffin sections of 54 human breast carcinomas using monoclonal antibodies to p21. The control group consisted of ten cases of benign fibrocystic disease. The p21 expression was significantly higher in cancer cells than in epithelial cells of control specimens. No correlations, however, were observed between oncogene product expression and tumor size, histologic type, or grade. As a group, tumors with axillary lymph node metastases expressed higher levels of ras p21 than nonmetastasizing tumors. However, because of the significant overlap in individual p21 values, it is unlikely that the immunohistochemical assay for p21 could be used to predict the behavior of mammary carcinomas.
Breast Neoplasms↗
Subdural hematoma after normal CT.
Two patients suffered minor head injuries diagnosed as cerebral concussions. Both had normal CTs in the emergency room but developed progressive neurologic symptoms weeks later. Both had large subdural hematomas requiring surgical drainage. Physicians should be alert for neurologic deterioration in patients with minor head injuries, even after normal CTs.
Craniocerebral Trauma↗
Deoxyribonucleic acid ploidy and cell cycle events in benign colonic epithelium peripheral to carcinoma.
DNA ploidy and cell cycle phases of benign human colonic epithelium peripheral to adenocarcinoma were analyzed by flow cytometry in 188 prospective cases. Human colonic epithelium was shown to be diploid with a mean DNA index (DI) of 1.01. The G0G1 compartment accounted for nearly 93% of the cells with the remainder in the S and G2+M phases. Parallel [3H]thymidine uptake on selected cases confirmed the relatively low proliferative activity of colonic mucosa. The DNA index and the cell cycle compartments exhibited no correlation to the ploidy, Dukes' stage, size, and anatomical location of the corresponding malignant tumors. Approximately 25% of the benign samples possessed DI values outside of the diploid range (defined as the mean +/- sd). Analysis of these apparently hypo- (less than 0.92) and hyper- (greater than 1.09) diploid, histologically normal samples in terms of cell cycle kinetics and their relationship to Dukes' stage, location, distance, and the ploidy of the tumor showed no correlation. The only characteristic differentiating these "aberrant" samples from diploid benign tissue was variation in DI possibly due to differences in fluorochrome binding or accessibility to DNA. Whereas these results indicate some degree of variability in the DNA content of benign colonic epithelia, neither DI nor cell cycle kinetics appear to be affected by the presence of a malignant tumor and are not representative of either the ploidy or pathologic stage of the corresponding colonic carcinoma.
Adenocarcinoma↗
Methadone applicant dropouts: impact of requiring involvement of friends or family in treatment.
This paper examines attrition among applicants to a methadone maintenance program before and after it began to require that applicants have a relative or close friend willing to act as a treatment sponsor. Few applicants were unable to locate sponsors. The dropout rate was greater for Blacks than for Hispanics and Anglo Whites both before and after the sponsor requirement was introduced. However, young addicts, addicts with recent drug histories, and singles were somewhat less likely to enter treatment after the requirement was introduced. Implications for drug treatment clinicians and administrators are discussed.
Adult↗
Beryllium carcinogenesis. I. Inhalation exposure of rats to beryllium sulfate aerosol.
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Adenocarcinoma↗
International training for drug abuse treatment and the issue of cultural relevance.
During the last ten years, there has been an increased demand for culturally relevant drug abuse treatment that is responsive to the unique needs of international populations, each with its own special culture and taboos. This article explores the assumptions that these distinct cultural characteristics require different treatment approaches to be effective, and presents both curriculum content and training designs used in educating diverse cultures in drug abuse treatment strategies. The authors discuss their training experiences in Central Europe, the Mediterranean, China, and Southeast Asian countries and conclude that, while cultural uniqueness certainly exists, it may be greatly exaggerated in terms of the need for special treatment modalities in the field of drug abuse treatment.
Counseling↗
The relationship between crime and drugs: what we have learned in recent decades.
The focus of this article is criminal drug users and their changing behavior. Two important considerations are addressed within this topic. First, an overview of drug use is given, including a brief historical perspective on its treatment as well as its implications on crime. The article also discusses why substance abuse treatment in the criminal population is necessary and on what scale. Specifically, the etiology of the relationship between crime, violence and substance abuse is explored. It then delves into what has worked and what hasn't. Finally, recommendations are made regarding where the research indicates we should go from here.
Adolescent↗
Assessment of fine needle aspiration as a screening test for occult prostatic carcinoma.
As part of an ongoing study of objective parameters of prognostic value in prostatic carcinoma, a routine procedure was developed to aspirate all prostates prior to surgery. These targets were different from those of other workers in the field of prostatic fine needle aspiration (FNA), who generally advocate that FNA be confined to suspicious nodules. The aspirations were performed by a large group of practicing urologists who had no special training in prostatic FNA except for guidelines provided by their peers and information available in the literature. This approach permitted an assessment of the performance of FNA as a screening test rather than as a diagnostic procedure. During the period from January 1983 to February 1987, 1,683 patients had prostatic FNAs performed (plus subsequent histologic study). The following diagnoses were rendered: "inadequate/scanty specimen" in 625 cases (37%), "negative/atypical" in 844 cases (50%) and "suspicious/positive" in 214 cases (13%). Histologic examination showed stage A1 prostatic adenocarcinoma in 18 patients. The cytologic diagnoses on these 18 patients were inadequate/scanty in 3 (17%), negative/atypical in 13 (72%) and suspicious/positive in 2 (11%). Of the 214 patients with a positive/suspicious diagnosis by FNA, the diagnosis of prostatic carcinoma was confirmed by tissue evidence in 200; the other 14 patients had either no evidence of prostatic carcinoma on surgical biopsy (needle biopsy/transurethral resection/suprapubic prostatectomy) or had no surgical biopsy. Eight of the 14 patients developed clinical evidence of carcinoma, 1 died of urinary bladder carcinoma and 1 was lost to follow-up. In the remaining four patients, there is still no evidence of prostatic carcinoma after about one-and-one-half years of follow-up. These results indicate that (1) specialized training is required in order to obtain adequate smears by prostatic FNA; (2) prostatic FNA is not a good screening technique for detecting stage A1 prostatic carcinoma; and (3) a positive diagnosis by prostatic FNA, even when not confirmed by tissue biopsy, is still an indication of disease.
Adenocarcinoma↗
Diagnostic value of cytology of voided urine.
Cytologic examination of the sediment of voided urine is the only noninvasive method of detection, diagnosis and follow-up of tumors of the bladder and other anatomic components of the lower urinary tract. In order to assess the value of cytology of voided urine, we analyzed the diagnostic yield in 203 episodes, each composed of three sediments of voided urine obtained on consecutive days. For each one of these episodes, histologic material was available and was reviewed. Of special interest were 181 instances of primary or recurrent bladder tumors; in 37 of these patients, random biopsies of the bladder were also available for review. The concept of intraurothelial neoplasia (IUN), graded I, II or III, was introduced to describe degrees of atypia in flat urothelium, with IUN grade III corresponding to nonpapillary carcinoma in situ. The results documented that cytology of voided urine is highly reliable in the diagnosis of high-grade tumors, with a sensitivity of 94.2%. In primary flat carcinoma in situ (IUN III), the sensitivity was 100%. The method failed in the recognition of grade I papillary tumors and in about one-third of grade II tumors. There were no false-positive results in this study. In the 151 positive cases, the cytologic diagnosis was established on the first specimen in 79%, on the second specimen in an additional 14% and on the third specimen in 7% of cases. These results justify the use of three consecutive daily urine specimens for optimal diagnostic results. There is a remarkable similarity between the presence of cancer cells in voided urine and the DNA ploidy of bladder tumors, as established by Tribukait. The observations reported herein suggest that positive urine cytologies may correspond to aneuploid tumors and hence be not only of diagnostic but also of prognostic value. A direct proof of this hypothesis is under investigation; the results of this study justify the need for a field trial of an automated image analysis diagnostic system that was developed in this department.
Carcinoma↗