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Detection of cytomorphological changes in oral mucosa among alcoholics and cigarette smokers.

Introduction

Oral cancer is one of the six most common cancers in the world, (1) and is one of ten major causes of death across the globe. (2) It is a disfiguring disease prevalent among middle-aged adults and is associated with low survival rate. (3) Two thirds (2/3) of oral squamous cell carcinoma and 75% of head and neck cancer can be attributed to tobacco use and alcohol consumption. (4,5) The risk increases with the frequency of exposure. (6) A recent study showed that 48% of head and neck cancer patients were alcoholics. (7) While, tobacco smoking has been observed to be associated with increasing risk of oropharangeal cancer and oral leukoplakia. (8) Most oral cancers are preceded by precursor lesion, which could be of great help in early diagnosis. Oral cytology, which is largely based on the presence of nuclear or cytoplasmic alterations, can easily be performed to detect cancer at an early stage and to establish quantitative techniques. (9-11) This study aims to investigate the cytomorphological changes in the buccal mucosa and the association with cigarette smoking and alcohol consumption.

Methods

Two hundred cytological materials were randomly collected from volunteers in Khartoum state, Sudan; 50 of the total volunteers were alcoholics (have taken more than 21 standard drinks per week), 50 were regular cigarette smokers, 50 were both alcohol drinkers and cigarette smokers; while another 50 volunteers were considered as a control group who were neither drinkers nor smokers. Each participant was well informed about the study and signed a written ethical consent form before participating in the study. The study was approved by Ethical Committee, College of Medical Laboratory Research Board, Sudan University of Science and Technology.

Buccal smears were taken from the subjects by scraping; using a brush and tongue depressor. Smears were fixed immediately in 95% ethyl alcohol for 15 minutes and eventually stained, adopting the Papanicolaou procedure. Quality control measures were adopted during sample collection and processing. For cytological assessment; each smear was examined for atypia, presence of bacteria or fungi, leukocytes and keratinization. Atypia was recognized when one or more of the following was observed: disturbed chromatin distribution, alteration in nuclear size, increased nuclear DNA content, prominent nuclear, multi nucleation, abnormal nuclear line, hyperchoromatosis and cytoplasmic vacuolations. Data were analyzed using the SPSS computer program. Frequencies, cross tabulation and chi-square were calculated.

Results

The age and sex of the study participants are presented in Table 1. One hundred and thirty-three (88.7%) of the participants were males and 17 (11.3%) were females; age ranged from 20-75 years. The cytopathological changes observed in the buccal smears are depicted in Table 2. Cell atypia was detected in 4 (8%), 6 (12%) and 7 (14%) cases among the alcoholics group, smokers group and in the alcoholics and smokers group, respectively. Hyperkeratosis was observed in all groups; the highest form was detected in the alcoholics and smokers group, while the lowest form was detected in the alcoholic group; 10 (20%) and 5 (10%) of cases, respectively. Changes in cells infected by human papilloma virus were detected in 4% and monilia in 2% of the cases. Also, 20% of the individuals showed hyperkeratosis and 12% showed no lesions.

Cocci and actinomyces bacterial species were detected in all the groups; the alcoholics constituted the highest cases (n = 16; 32%), while the smokers group accounted for the lowest frequency (n = 8); 16%). Nuclear enlargement changes indicating the presence of human papilloma virus (HPV) were observed in only some buccal smears of alcoholics and smokers group, (Table 2). In addition, only six cases in the latter group showed no cytological changes in their smears in comparison to 25 cases in the alcoholics group, and 22 cases in the smokers group.

In the control group (neither smokers, nor alcoholics); neither cell atypia nor hyperkeratosis was observed. But in the smears of 6 (12%) subjects, bacteria (cocci and actinomyces species) were detected. Furthermore, it was reported that 24, 17 and 5 participants used to drink liquor, beer or both liquor and beer respectively, in the alcoholics group. Yet, only two subjects from the participants who drink liquor or both liquor and beer showed cell atypia in their buccal smears.

Discussion

The present results report the causes of oral cell changes among cigarette smoking and alcohol drinking subjects, which are strongly related to cancer risks. The risk tends to increase with the duration of smoking and alcohol consumption; the longer an individual is exposed to smoking and alcohol consumption, the higher the risk. (12) Exposure to ethanol with or without tobacco smoking has been found to be associated with carcinogenic cytological changes. (13) Anderson et al. examined 276 oral smears from alcoholics, and observed a significant increase in the number of dyskeratotic cells compared to controls. (14) Prolonged alcohol consumption is reported to be the cause of pathological changes in oral mucosa including dysplasia, keratosis and increased mitotic figures, (15) and increased nuclear cytoplasmic ratio has also been observed. (16)

In this study, cell atypia was not observed in liquor drinkers. It is claimed that most prevalent alcohol beverages heavily consumed in a given population usually cause most cytological changes. (17-19) A high risk of oropharangeal and esophageal cancer is commonly associated with spirit consumption and wine drinking, rather than beer. (20)

This study suggests that cigarette smoking and alcohol consumption are more common among younger individuals (43.3%), followed by subjects aged between 30-40 years (23.3%). These individuals are subjected to greater risks of developing oral pathological changes, which may lead to cancer; thus the risk is thought to increase with prolonged exposure. (21) The appearance of bacteria in some smears of all the studied groups coupled with the presence of leukocytes, indicated that oral infections may be established in association with cigarette smoking or alcohol consumption.

[FIGURE 1 OMITTED]

Another observation was that the cytopathological changes indicative of HPV was only detected in the alcoholics and smokers group, suggesting that the two habits increase susceptibility to infection. Alcohol consumption may lead to the accumulation of pathogenic microbes within the oral mucosa leading to chronic infection. (22) Moreover, alcohol is also considered to reduce memory, salivation and inflammatory responses favoring bacterial multiplication. (23,24) Castellsagu et al. reported that simultaneous exposure to both alcohol and tobacco increases the risk of oral cancer by 13-fold. (21) Furthermore, heavy alcohol consumption and smoking have been identified as primary risk factors for nearly 80% of oral malignancies. (25)

Conclusion

Alcohol consumption and cigarette smoking are risk factors for oral atypical cellular changes and possibly oral infection. The degree of change depends on the duration of alcohol consumption and cigarette smoking.

DOI 10.5001/omj.2011.85

Acknowledgements

The authors reported no conflict of interest and no funding was received for this work.

Received: 23 May 2011/ Accepted: 01 Aug 2011

References

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Mohammed S. Abdelaziz [mail], Tagwa E. Osman

Department of Histopathology and Cytology, College of Medical Laboratory Science, Sudan University of Science and Technology, Khartoum-Sudan. E-mail: mohamedsiddig88@yahoo.com
Table 1: Distribution of the study population by age and sex.

Age group         Sex of study group
(Years)
                Male          Female

             N      %       N      %

20-30        65     43.3    0      0.0
31-40        35     23.3    5      3.3
41-50        19     12.7    9      6.0
51-60        7      4.7     3      2.0
61-70        5      3.3     0      0.0
>70          2      1.3     0      0.0

Total        133    88.6    17     11.3

Age group       Sex of control group
(Years)
                 Male         Female       Total

             N      %       N      %

20-30        13     26.0    10     20.0    88
31-40        8      16.0    4      8.0     52
41-50        5      10.0    4      8.0     37
51-60        3      6.0     3      6.0     16
61-70        0      0.0     0      0.0     5
>70          0      0.0     0      0.0     2

Total        29     58      21     42      200

Table 2: Frequency of cytopathological results among
the study population.

                                  Study group

                          Alcohol
                          consumption    Cigarette smoker

Results                   N      %       N      %

Atypia                    4      8       6      12
Hyperkeratosis            5      10      7      14
Coccal infections         9      18      9      18
Actinomyces infections    7      14      6      12
HPV(infected cells)       0      0       0      0
Monilia                   0      0       0      0
No cytological changes    25     50      22     44

Total                     50     100     50     100

                                 Study group

                          Cigarette and
                          alcohol abuse  Control group

Results                   N      %       N      %

Atypia                    7      14      0      0.0
Hyperkeratosis            10     20      0      0.0
Coccal infections         16     32      6      12.0
Actinomyces infections    8      16      0      0.0
HPV(infected cells)       2      4       0      0.0
Monilia                   1      2       0      0.0
No cytological changes    6      12      44     88.0

Total                     50     100     200    100
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Article Details
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Title Annotation:Original Article
Author:Abdelaziz, Mohammed S.; Osman, Tagwa E.
Publication:Oman Medical Journal
Article Type:Report
Geographic Code:6SUDA
Date:Sep 1, 2011
Words:2135
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