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Revista Brasileira de Geriatria e Gerontologia

On-line version ISSN 1981-2256

Rev. bras. geriatr. gerontol. vol.21 no.1 Rio de Janeiro Jan./Feb. 2018

https://doi.org/10.1590/1981-22562018021.170114 

Original Articles

Influence of symptoms of depression on the quality of life of men diagnosed with prostate cancer

Taysi Seemann1 

Fernanda Pozzobom1 

Melissa de Carvalho Souza Vieira1 

Leonessa Boing1 

Zenite Machado1 

Adriana Coutinho de Azevedo Guimarães1 

1 Universidade do Estado de Santa Catarina, Programa de Pós-graduação em Ciência do Movimento Humano. Florianópolis, SC, Brasil.


Abstract

Objective:

to evaluate the prevalence of symptoms of depression among men diagnosed with prostate cancer and their association with quality of life and treatment-related factors.

Methods:

a cross-sectional study of 85 men with a mean age of 66±8 years who were diagnosed with prostate cancer was performed. The survey was based on a questionnaire with previously validated instruments which investigated social, demographic and economic characteristics, the history of the disease, quality of life (European Organization for Research and Treatment of Cancer Questionnaire C30 - EORTC QLQ-C30 / QLQ-PR25) and symptoms of depression (Beck Depression Inventory). The presence of symptoms of depression was considered an outcome, and statistical analyzes were performed using the Chi-square test, Fisher's exact test, Mann Whitney U test and Poisson regression (p<0.05).

Results:

significant results were found for quality of life in relation to symptoms of depression in the functional, global and symptomatic health scale (p<0.001). This demonstrates that the presence of symptoms of depression is related to a negative quality of life.

Conclusions:

for a greater understanding of prostate cancer and its consequences on the quality of life of patients it is important to consider possible disorders in psychological aspects caused by the illness, as symptoms of depression are frequent in patients undergoing treatment for prostate cancer.

Keywords: Prostate Neoplasm; Quality of Life; Depression Symptoms

Resumo

Objetivo:

Avaliar a prevalência de sintomas depressivos em homens com diagnostico de câncer de próstata e a associação com escores de qualidade de vida e fatores relacionados ao tratamento

Métodos:

Estudo transversal composto por 85 homens, com média de idade de 66±8 anos, diagnosticados com câncer de próstata; utilizou-se um questionário com instrumentos previamente validados onde investigaram-se as características sociais, demográficas, econômica, história da doença, qualidade de vida (European Organization for Research and Treatment of Cancer Quality of Life Questionnaire C30 - EORTC QLQ-C30/ QLQ-PR25) e sintomas depressivos (Inventário de Depressão de Beck). Foi considerado como desfecho a presença de sintomas depressivos, sendo realizadas análises estatísticas por meio do teste qui-quadrado, teste Exato de Fisher, teste U de Mann Whitney e Regressão de Poisson (p<0,05).

Resultados:

Foram encontrados resultados significativos para a qualidade de vida na escala funcional, saúde global e sintomática (p<0,001), em relação aos sintomas depressivos. Demonstrando que a presença de sintomas depressivos está relacionada à qualidade de vida mais negativa.

Conclusões:

Para a melhor compreensão sobre o câncer prostático e suas consequências na qualidade de vida dos pacientes faz-se necessário levar em consideração as possíveis alterações nos aspectos psicológicos ocorridos diante da realidade dessa doença, uma vez que os sintomas depressivos têm sido frequentes em pacientes no tratamento do câncer de próstata.

Palavras-chave: Neoplasia da Próstata; Qualidade de Vida; Sintomas Depressivos

INTRODUCTION

With increased prevalence since the 1960s, prostate cancer is considered a global public health problem. It is the sixth most common cancer in the world and accounts for about 10% of all such diseases2. In Brazil, it is the second most common type of cancer among men and it is estimated that of the 600,000 new cancer cases in 2016 and 2017, 61,000 thousand involve prostate cancer3. The Brazilian Society of Urology4 observes that Santa Catarina is one of the Brazilian states with the highest incidence of cases.

The increase in this incidence over the years can be explained by the evolution of diagnostic methods and the improvement of the quality of the country's information systems5. Faced with such increased incidence, early diagnosis and appropriate treatment are essential, along with suitable posttreatment and the individual's perception of their quality of life6, as all the therapeutic modalities present significant risks and side effects to patients5.

Among the modalities of treatment for prostate cancer, radical prostatectomy, in which the patient undergoes complete removal of the prostate, is the oldest and possibly the most effective7. Such a method can cause several side effects, such as urethral stenosis, urinary incontinence, erectile dysfunction5, fatigue, general distress, functional disability and depression8,9, factors that can significantly affect the quality of life of such men5.

Studies evaluating quality of life and prostate cancer have identified depression as one of the main psychological problems exhibited10-12, and this condition is present in one in five patients13. Depression can trigger problems related to recovery and a decrease in immunity, minimizing the survival chances of patients14, and the treatment of cancer through adjuvant chemotherapy may further increase the risk of this condition15. Patients live with pain, physical disfigurement and the threat of death on a daily basis, and these problems often do not end with surgery or the completion of conventional treatment, as the phantoms of metastasis and the recurrence of the disease remain, leading to states of depression and negative quality of life13.

Surveys that address the relationship between depressive symptoms and the quality of life of patients with prostate cancer are extremely important, as greater knowledge about the subject may aid in the treatment and post-treatment of the disease, as well as the promotion of the good social and mental well-being of these patients, which are essential to their daily life. The objective of the present study was therefore to evaluate the prevalence of depressive symptoms in men diagnosed with prostate cancer and the association with quality of life scores and factors related to treatment.

METHODS

An observational, analytic cross-sectional study was performed, comprised of 85 men diagnosed with prostate cancer undergoing treatment and post-treatment in the Centro de Pesquisas Oncológicas (the Center of Oncological Research) (CEPON) in the city of Florianópolis, Santa Catarina, Brazil. The recruitment of these men occurred in various sectors of CEPON, namely the chemotherapy, radiotherapy and physiotherapy centers and the waiting rooms of doctors' surgeries. Their selection was based on inclusion criteria, namely that they were between 40 and 80 years and were in the clinical treatment or post-treatment phase. The exclusion criteria included a classification of illiterate in level of schooling due to the need to understand the questionnaire, previous oncological treatment in an institution other than CEPON, or a diagnosis of metastasis, to avoid bias in the type of treatment and prognosis. The sample size was calculated based on a significance level of 5%, a test power of 80% and a mean effect size of 0.5 considering the comparison of means test, meaning that 102 patients were required to compose the sample.

The data were collected using a structured questionnaire, applied by three researchers trained for this task. All patients who agreed to voluntarily participate in the study were asked to sign a Free and Informed Consent Form.

The structured questionnaire included variables relating to the general characterization of the sample, anthropometric measurements (body mass and height), symptoms of depression and quality of life. General characteristics and those related to disease (age, marital status, education, economic level, presence of diseases, surgical intervention), as well as the anthropometric measures were self-reported.

The classification of weight was performed based on the calculation of Body Mass Index (BMI), and was categorized according to the WHO16, which suggests: underweight (BMI<18.4); normal weight (BMI 18.5-24.9); overweight (BMI 25.0-29.9); pre-obesity and obesity (BMI>30.0). For the present study, for statistical purposes, we chose to group the categories into normal weight (underweight and normal weight) and overweight (overweight, pre-obesity and obesity) due to the low numbers in those categories.

Economic level was verified based on the IBGE criterion, classifying the subjects into economic strata A, B, C, D and E, according to number of minimum wages in the monthly family income, based on the 2014 minimum wage of R$724.00. Due to the lower number of men in these categories, the subjects were classified into upper class (A+B), middle class (C), and lower class (D+E).

Quality of life was evaluated through the European Organization for Research and Treatment of Cancer Questionnaire C30 - EORTC QLQ-C3017, validated in Brazil with a Cronbach alpha score of 0.72 for the overall health scale, 0.86 for the functional scale and 0.81 for the symptomatic scale1,18. This questionnaire is based on assessing the quality of life of cancer patients over the last four weeks, in terms of functional (physical, functional, emotional, social and cognitive), symptomatic (fatigue, pain and nausea/vomiting, dyspnea, insomnia, appetite, constipation, diarrhea and financial difficulties) and global health. The question scores result in a total score from 0 to 100, with the higher the value found the better the quality of life in the overall and functional scales. In the symptomatic scale, meanwhile, a higher value represents a greater presence of symptoms, determining a worse quality of life. The EORTC QLQ-C30 is supplemented by specific modules for different types of cancer, and the QLQ-PR25 is specifically used for prostate cancer. This instrument has 25 questions incorporated in multi-item scales to measure the symptoms of the treatment over the previous week, the symptoms occurring in the last four weeks and sexual functioning.

The Beck Depression Inventory (BDI), originally developed by Beck19, was used to investigate depressive symptoms. It is a self-reported instrument with 21 multiple-choice objective questions that indicate depressive symptoms (lack of hope, irritation, depressive cognitions, guilt and feelings of punishment, as well as physical symptoms such as fatigue, weight loss and loss of sexual interest). It was validated in Brazil by Cunha20, who maintained the original scale of 21 items, with scores ranging from zero to three, with four alternative responses, which correspond to increasing levels of the severity of depression. The BDI has been successfully used in studies with men with cancer21,22. The scores of the individual items are added together and result in a total score, with a maximum score of 63 points, which indicates a high degree of depression, and a lowest possible score of zero, which corresponds to the absence of depression. Categorization was performed according to the standardization used in studies with cancer patients, with scores from zero to 10 equaling without depression or minimal depression; scores from 11 to 18 representing mild depression; scores from 19 to 29 corresponding to moderate depression; and scores from 30 to 63 indicating severe depression23. For statistical and analytical reasons, scores were categorized into the absence of depressive symptoms (scores from zero to 10) and the presence of depressive symptoms (scores ≥11). We chose not to use the term depression, as this term is only recommended for use in patients with concomitant clinical diagnosis24.

In order to compare general characteristics and those related to disease and quality of life among the groups with the presence and absence of depressive symptoms, the chi-squared test or Fisher's exact test were used. The Mann Whitney U-Test was used to compare the quality of life scores of the groups, as the Kolmogorov Smirnov Test (p>0.05) did not identify the data as normal, except for the functional scale variable. Poisson regression was used to estimate the crude and adjusted prevalence ratios (PR) with a respective 95% CI. The dependent variable (outcome) was the presence of depressive symptoms, so for regression analysis the sample was divided into two groups, namely men with depressive symptoms and those without depressive symptoms. Adjusted analysis was performed for all the demographic, social, economic and clinical variables. The criterion for remaining in the adjusted analysis was a value of p≤0.20.

The data were collected between October 2014 and July 2015. The study complied with National Health Council Resolution nº 466/2012 and was approved by the Ethics Committee on Research Involving Human Beings (CEPSH) of UDESC, protocol nº 688.548 on June 16, 2014 and by the Ethics Research Committee of CEPON (CEP), protocol nº 818.174, on October 3, 2014.

RESULTS

Although there were no significant differences in the variables, it was observed that the men with depressive symptoms were mostly older (61 to 80 years (76.9%)), had attended elementary school (53.8%), were unemployed, retired or absent from work due to health reasons (84.6%), of a lower economic class (88.5%), married (80.8%) and overweight (61.5%). These data are not shown in the table.

Table 1 presents the data comparing the groups with the absence and presence of depressive symptoms in relation to the demographic, social and economic characteristics of the study participants.

Table 1 Comparison between groups with absence and presence of depressive symptoms in relation to the demographic, social and economic characteristics of men after the diagnosis of prostate cancer (N=85). Florianópolis, Santa Catarina - CEPON 2014/2015.  

Depressive symptoms
Variables Absent n(%) Present n(%) p value PR (CI95%)***
Age (years) 0.222*
40 to 60 11(18.6) 6(23.1) 1.061 (0.825-1.364)
61 to 80 48(81.4) 20(76.9) 1
Schooling 0.315*
Elementary School 35(60.3) 14(53.8) 1
High School or Higher Education 23(39.7) 12(46.2) 1.059 (0.865-1.296)
Current profession 0.210**
Unemployed/Retired/Sick Leave 43(72.9) 22(84.6) 1.149 (0.931-1.416)
Up to two categories 16(27.1) 4(15.4) 1
Marital status 0.307*
Partner 41(69.5) 21(80.8) 1.129 (0.919-1.387)
No partner 18(30.5) 5(19.2) 1
Economic class 0.769**
Upper Class (A+B) 2(3.4) 1(3.8) 1.158 (0.899-1.492)
Middle Class (C) 9(15.5) 2(7.7) 1
Lower Class (D+E) 47(81.0) 23(88.5) 1.164 (0.651-2.078)
Weight status 0.689*
Overweight 41(70.7) 16(61.5) 1
Normal weight 17(29.3) 10(38.5) 1.094 (0.881-1.358)

*Chi-squared test; **Fisher’s Exact Test; ***Prevalence Ratio - Poisson’s Regression.

The clinical characterization of the participants revealed that 64.7% of the patients had other diseases, 48.2% reported urinary incontinence, 54.1% had not undergone radical prostatectomy surgery as a form of treatment, while the majority (56.8%%) underwent radiotherapy and did not finish treatment (43.5%). In addition, 89.4% of the participants did not receive advice to undergo physiotherapy as part of the treatment (data not shown in the table).

Table 2 shows the characteristics of the disease in relation to the absence or presence of depressive symptoms. A significant result was found in the physiotherapy category (p<0.021), in which men with the greatest presence of depressive symptoms were those who did not undergo such treatment (76.9%).

Table 2 Comparison between groups with the absence and presence of depressive symptoms in relation to the characteristics of the disease and the treatment of men after the diagnosis of prostate cancer (N=85). Florianópolis, Santa Catarina - CEPON 2014/2015.  

Depressive symptoms
Variables Absent n(%) Present n(%) p value PR (CI95%)***
Suffers other diseases 0.562*
Yes 37(62.6) 18(69.2) 1.062 (0.869-1.299)
No 22(37.3) 8(30.8) 1
Urinary incontinence 0.247*
Yes 15(44.1) 26(57.7) 1.123 (0.924-1.365)
No 11(55.9) 33(42.3) 1
Radical prostatectomy 0.973*
Did not undergo 14(54.2) 32(53.8) 1
Underwent 12(45.8) 27(46.2) 1.003 (0.824-1.221)
Type of treatment 0.528**
Chemotherapy 5(21.7) 2(14.3) 1
Radiotherapy 14(60.9) 7(50.0) 1.049 (0.710-1.55)
Hormone therapy 4(17.4) 5(35.7) 1.310 (0.822-2.088)
Finished o treatment 0.154*
Yes 12(20.3) 7(26.9) 1.217 (0.941-1.573)
No 23(39.0) 14(53.8) 1.229 (0.998-1.513)
Not yet started 24(40.7) 5(19.2) 1
Physiotherapy 0.021*
Yes 3(5.1) 6(23.1) 1.497 (1.083-2.069)
No 56(94.9) 20(76.9) 1.00

*Chi-squared test (N=85); **Fisher's exact test; ***Prevalence ratio - Poisson Regression.

In the EORTC QLQ C30 instrument, the closeness of the score to 100 represented a better quality of life; except on the symptomatic scale where a score closer to 100 meant a worse quality of life. The results of the comparison between quality of life and the absence and presence of depressive symptoms are presented in Table 3. Significant results were observed in most variables, except for loss of appetite (p=0.078) and sexual functioning (p=0.068).

Table 3 Comparison between the groups with absence and presence of depressive symptoms in relation to the quality of life of men following the diagnosis of prostate cancer (N=85). Florianópolis, CEPON 2014/2015.  

Depressive symptoms
Variables Total Mean (±sd) Absent Mean (±sd) Present Mean(±sd) p value
EORTC-C30
Functional scale * 78.77±18.48 86.10±10.07 62.13±22.30 <0.001
Median (Q25-Q75) Median (Q25-Q75) Median (Q25-Q75)
Cognitive function 83.33(66.66-100.00) 100.00(83.88-100.00) 75.00(66.66-100.00) 0.025
Emotional function 75.00(54.16-91.66) 83.33(66.67-100.00) 50.00(25.00-75.00) <0.001
Physical function 93.33(73.33-93.33) 93.33(80.00-100.00) 70.00(36.67-93.33) <0.001
Social function 100.00(66.66-100.00) 100.00(100.00-100.00) 75.00(66.66-100.00) <0.001
Overall health scale** 75.00(15.38-35.89) 83.33(66.67-91.66) 54.16(47.91-66.66) <0.001
Symptomatic scale** 23.07(15.38-35.89) 20.51(12.85-28.20) 42.30(23.07-62.17) <0.001
Fatigue 11.11(0.00-33.33) 0.00(0.00-22.22) 44.44(19.44-100.00) <0.001
Loss of appetite 0.00(0.00-0.00) 0.00(0.00-0.00) 0.00(0.00-33.33) 0.078
Insomnia 0.00(0.00-66.67) 0.00(0.00-66.66) 66.66(0.00-100.00) 0.003
Ache 0.00(0.00-33.33) 0.00(0.00-16.66) 25.00(0.00-66.66) 0.003
Nausea and vomiting 0.00(0.00-0.00) 0.00(0.00-0.00) 0.00(0.00-33.33) 0.011
Dyspnea 0.00(0.00-0.00) 0.00(0.00-0.00) 0.00(0.00-0.00) 0.041
Cold 0.00(0.00-33.33) 0.00(0.00-33.33) 16.66(0.00-100.00) 0.014
Diarrhea 0.00(0.00-0.00) 0.00(0.00-0.00) 0.00(0.00-33.33) 0.050
Financial difficulties 0.00(0.00-33.33) 0.00(0.00-0.00) 33.33(0.00-100.00) <0.001
EORTC- PR25 <0.001
Functional scale ** 84.21(64.91-93.85) 91.22(78.94-96.49) 71.05(59.64-84.21) <0.001
Sexual activity 66.66(33.33-66.66) 50.00(33.33-83.33) 75.00(50.00-100.00) 0.039
Sexual functioning 75.00(54.16-75.00) 75.00(41.66-75.00) 58.33(50.00-100.00) 0.068
Symptomatic scale** 15.78(6.14-35.08) 8.77(3.5-21.05) 28.94(15.78-40.35) <0.001
Urinary symptoms 25.00(12.50-50.00) 20.83(4.16-37.50) 43.75(21.87-57.29) 0.001
Intestinal symptoms 0.00(0.00-12.50) 0.00(0.00-8.33) 8.33(0.00-16.66) 0.017
Hormone treatment 11.11(0.00-30.55) 11.11(16.67-38.88) 22.22(16.66-38.88) <0.001
Incontinence 0.00(33.33-100.00) 0.00(0.00-100.00) 33.33(0.00-100.00) 0.041

* Independent T-test, values presented as mean and standard deviation; **Mann Whitney U-test, values presented as median and interquartile range. Md - Median; IQ - Interquartile.

In the components of the functional scale, men with depressive symptoms had a more negative quality of life than those with the absence of depressive symptoms, with p<0.001 for the emotional, physical and social functions, and p=0.025 for cognitive function. The same was found in the overall health scale (p<0.001). In the symptomatic scale, significant differences were observed for the majority of variables, namely fatigue (p<0.001), insomnia (p<0.003), pain (p<0.003), nausea and vomiting (p<0.011), dyspnea (p<0.041) diarrhea (p<0.050) and financial difficulties (p<0.011), but not for the variable loss of appetite. Worse results were found among men with depressive symptoms.

When the specific instrument for men with prostate cancer (EORTC-PR25) was observed, significant results (p<0.039) were identified on the functional scale, as well as for all the variables of the symptomatic scale, with the presence of depressive symptoms group exhibiting worse quality of life results.

DISCUSSION

Despite increases in survival rates and advances in diagnosis and treatment24, cancer is still considered a death sentence and carries with it psychological consequences, such as fear, sadness, and depression1. Literature shows that the main psychological problems presented by patients diagnosed with prostate cancer are depression and anxiety13,24. The aim of the present study was to investigate the relationship between the presence or absence of depressive symptoms and the quality of life of men in the treatment and post-treatment phase of prostate cancer.

The results showed that men with depressive symptoms had worse quality of life in the functional, overall health and symptomatic scales. These results corroborate the findings of Brazilian and non-Brazilian literature13,25. The functional quality of life scale identified an association with physical, functional, emotional, social and cognitive issues. These aspects were more affected in patients with depressive symptoms. It is known that depression has a substantial impact on the health of patients with chronic diseases, including cancer26, and that the presence of depressive symptoms is directly related to physical, psychological and social decline, with characteristics that impact quality of life and its functionality,5,27. With a disease such as cancer these factors can be exacerbated, as the illness can bring feelings of inferiority and fear of rejection in social relationships28, as well as side effects such as a decline in physical functioning29,30. In addition, non-Brazilian studies have shown that cancer treatment coupled with psychological factors such as depression can also affect some cognitive functions, such as short- and long-term memory, attention span, concentration, and language skills6,31.

Life habits are closely related to cancer32 and influence quality of life in terms of physical and emotional health14. The results in the present study showed that patients with depressive symptoms had an inferior quality of life in the overall health scale. This may be due to the possible side effects of cancer treatment, such as reduced bone density, decreased muscle mass and strength, weight and body fat gain, and a decline in physical functioning29,30. A study of sixty patients undergoing prostate cancer treatment showed that their physical functioning was significantly reduced after treatment and that they suffered weight gain and reduced muscle mass6. Van den Bergh et al.33, in a study with patients at the end of treatment, found low scores for physical health, anxiety and quality of life in general.

It has been found that in the treatment period of the disease there are consequences for the physical health of the patient, such as fatigue, insomnia, nausea and vomiting, pain, dyspnea, constipation, diarrhea, urinary and intestinal symptoms and urinary incontinence8,9. In the present study, the symptomatic scale of both the general and specific questionnaire for men with prostate cancer revealed that worst results were related to the presence of depressive symptoms. Such results may be because most patients are still undergoing treatment and are affected by its consequences, as previously mentioned.

Other symptoms that are uncomfortable for patients are urinary incontinence and dysfunction in sexual activity1, aspects of the functional scale of the specific instrument for prostate cancer which demonstrated a significant relationship with the presence of depressive symptoms. A non-Brazilian study of four hundred and thirty-seven patients with prostate cancer found that, two years after treatment, urinary incontinence was present in 48.8% of men and sexual dysfunction in 82.8%34. The treatment modalities for prostate cancer are the main causes for these two symptoms, which may persist even after the end of treatment3,35, and may be considered as a diminishing of their masculinity by patients, as the prostate is part of the masculine identity10. Literature reveals that the main feelings expressed by patients with prostate cancer are depression, failure, impotence in relation to the disease, fear of sexual impotence, anguish over loss of urinary control and autonomy, pain due to the loss of the capacity to have satisfactory erections and fear of being betrayed or abandoned by a sexual partner27,35.

It is important to highlight some limitations of the present study, such as the use of a questionnaire as a data collection tool, as well as the self-reporting of some data on the characteristics of the disease by patients, as the researchers did not have access to medical records; Also, as this is a cross-sectional study, it did not examine cause and effect relationships. Nor was it possible to achieve the expected sample size, with 17 participants fewer than required. Such a limitation may have occurred due to the refusal of some men to be part of the study, most probably due to the difficulties that accompany the treatment of cancer, as sample recruitment occurred in the hospital environment, and also because it deals with a topic considered a taboo for the population male as it affects a symbolic organ of masculinity. The advantages of the study, however, include its contribution to a greater knowledge of men with prostate cancer through other aspects of health, as well alerting to the risk that other factors, such as depression, can affect cancer treatment.

CONCLUSIONS

In view of these results, it can be seen that the presence of depressive symptoms significantly affects the quality of life of men with prostate cancer. There is therefore a need for greater support for the male population with this disease. These findings therefore support the idea that it is important to provide greater psychological attention to these patients in order to provide quality of information, psychological care, the formation of support groups and other measures, as in many cases survival without good quality of life may not be the best option for the patient, causing more suffering.

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Received: July 24, 2017; Revised: October 30, 2017; Accepted: December 11, 2017

Correspondence Taysi Seemann E-mail: taysiseemann@hotmail.com

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