Symptoms of colorectal cancer contributes to its localization and advancement.
Colorectal cancer (CRC) is a disease with constantly increasing frequency. In 2018 CRC was the third most common cancer in the world and the second case of death due to cancer. In the same year, about 1.8 million people have been diagnosed with this disease and approximately 860 000 have died. A high percentage of cases is observed in the developing countries of Central and Eastern Europe, Asia and South America. In turn, in countries with very high development rates (Western Europe, North America, Australia) the number of new cases is stabilizing. Colorectal cancer is more common in people over age 50, and more often in men. This cancer has a poor prognosis, the average 5-year survival is about 65% in highly developed countries and less than 50% in less developed countries [1-5].
Group of the most important factors which are responsible for development of colorectal cancer include: age (> 50 years), male gender, family history, obesity, low physical activity and sedentary lifestyle, diabetes and a high amount of red meat in the diet. In addition, existing inflammatory bowel diseases may contribute to the development of cancer [6,7]. What is more, genetic predispositions play a significant role in development of CRC. Increased incidence of colorectal cancer is observed in patients with familial adenomatous polyposis (FAP) and hereditary non-polyposis colorectal cancer (HNPCC). They are responsible for about 5% of all CRC cases [8,9].
During the development of colorectal cancer, numerous mutations of genes accumulate: APC, TP53, DCC, K-RAS. However, there are differences that include gene defects and the mechanism for the accumulation of mutations. Therefore, there are two separate ways of developing colorectal cancer: one is the adenoma-cancer sequence and the other is associated with mutator gene disorders . The gold standard in colorectal cancer diagnosis is colonoscopy and sigmoidoscopy. They are characterized by very high sensitivity. Recent reports indicate that screening studies conducted using these methods have reduced the morbidity and mortality rate by approximately 70% in the case of colonoscopy and 50% in the case of sigmoidoscopy. In addition, the following are used in the diagnosis: guaiac-based fecal occult blood test (gFOBT) and fecal immunochemical tests (FIT) for human haemoglobin in stool. However, they are characterized by lower sensitivity [1,11-14].
The aim of this study was to present characteristic clinical symptoms in patients with colorectal cancer, associated with local tumor spread and analysis of the relationship between symptoms and selected clinicopathological parameters, such as: age and sex of patient, location, histopathological type of cancer, grade of malignancy, local infiltration (T stage), metastasis to lymph nodes as well as distant metastases.
MATERIALS AND METHODS
The study involved 46 patients treated surgically due to colorectal cancer in the 2nd Clinical Department of General and Gastroenterological Surgery at the University Hospital in Bialystok, in the years 2005-2010. The study group consisted of 28 men and 18 women. Mean age of study group was 68.8, 10 patients were [less than or equal to]60, and 36 >60 years old. Symptoms associated with cancer have been selected from the patient's medical history. The subjective symptoms, described by the patient included: pain complaints, characteristic and localization of pain and the characteristic of bowel movements and stool. In addition, objective symptoms founded in a physical examination carried out by a doctor (pain and pathological resistance) have been described. Pain complaints symptoms have been described as absent or present. The pain characteristic was divided into dull and acute as well as continuous and intermittent. The pain localization were found in the epigastric, umblical or/and hypogastric region. The stool description includes its consistency (watery, mushy or formed), the color (yellow, light brown, brown, dark brown and black), the frequency of defecation (<1/day, 1/day, 2/day, [greater than or equal to]3/day), the presence of admixtures and their type (blood, mucus and mixed). Painfulness and pathological resistance were classified as absent or present. In accordance with the GCPs (Guidelines for Good Clinical Practice), this research was approved by the Bioethical Commission of the Medical University of Bialystok (R-I-002/83/202).
Each tumor was cut along a line that was parallel to the longest tumor axis. In this way 4 to 8 slices contained the cancer and also adjacent macroscopically unchanged tissues of 1-1.5cm in size was taken for histopathological assessment. Tissues were fixed in 10% buffered formalin within 24 to 48 hours.
The specimens were embedded in paraffin at a temperature of 56[degrees]C. Paraffin blocks were cut into 4Lim thick sections.
The obtained sections were stained with hematoxylin-eosin (H+E staining).
In the H+E stained sections the parameters as histological type (Hp), grade of histological malignancy (G), clinical-anatomical advancement (pTN) have been evaluated.
For statistic evaluation STATISTICA 13.3 software (Statsoft, Cracow, Poland) was used.
Correlations between colorectal cancer symptoms (pain complaints, pain character, pain localization, stool consistency, colour of stool, frequency of defecation, presence admixtures, type of admixture, painfulness and pathological resistance) and chosen clinicopathological parameters (age and sex of patients, tumor location, histological type of cancer, grade of histological malignancy (G), stage of tumor (T stage), presence of lymph node metastases and distant metastases) were tested with the use of Pearson's correlation test. A p value of <0.05 was considered statistically significant. Missing data were removed in pairs.
The pain complaints reported by patients occurred in 65.21% of patients with colorectal cancer.
Most often the pain was dull and intermittent. Mainly pain was localized in the hypogastric region (58.33% of patients), less frequently in the epigastric region (20.84% of patients) and umbilical region (16.66% of the patients).
The most common consistency of stool was formed type (62.22%), less freaquent was mushy (33.33%) and watery (4.45%). The predominant colour of the stool was brown (57.77% of patients) and dark brown (24.44% of patients).
Admixtures in the stool were observed in 48.88% of patients, and the most common of them was blood. Painfulness reported by a physician on physical examination were present in 55.55% of patients and pathological resistance described in only 13.63% of the patients with colorectal cancer (Table 1).
Correlations between clinical symptoms and clinicopathological parameters.
There were no statistically significant correlations between clinical symptoms and age and sex of patients, histological type, grade of histological malignancy (G), lymph node and distant metastases. Data not shown.
However, statistically significant correlations between symptoms and tumor localization have been observed. Admixtures in the stool were more frequent in tumors located in the rectum (p=0.024), while pain, painfulness and pathological resistance were more frequently observed in tumors located in the colon (p=0.014, p=0.026 and p=0.04 respectively) (Table 2). Correlations with other symptoms were not statistically significant.
Statistical analysis revealed relationship between clinical symptoms and T stage. Admixtures in the stool were more common in patients with less advanced tumors (T1+T2) compared to more advanced tumors (T3+T4) (p=0.032). In patients with less advanced tumors more often occurred a mucus or mixed (blood and mucus) admixture in the stool. On the other hand, patients with more advanced cancer had rather blood admixture (p<0.001) (Table 3). It has not been shown statistically significant relationship with other clinical symptoms.
Studies on the characteristic symptoms of colorectal cancer are still being described in the literature. This is to sensitize medical staff about the symptoms reported by patients. The purpose of these efforts is also to educate physicians about the importance of accurate physical and subjective examinations in patients reporting symptoms described in the literature. In addition, the aim of these studies is to make patients aware of not underestimating even discrete and less vexing symptoms, as this increases the probability of detecting the cancer on the early stages of its development . Some studies suggest that symptoms lasting for 3 months or longer, indicate a high probability of diagnosing colorectal cancer at an advanced stage [16-18]. Other studies show no relationship between the duration of symptoms and advancement of the disease at the time of diagnosis [19-21]. The most common symptoms occurring in patients with colorectal cancer and described in the literature are: rectal bleeding, abdominal pain and palpable tumor [22-24]. Our research also indicates frequent pain (present in 65.21% of patients). In our study, we have also observed admixture of blood in the stool in about 50% of patients, which is similar with the reports of other authors.
While there are reports in the literature about the relationship between pain and the age of patients, the above studies did not show a statistically significant relationship between them. However, Banaszkiewicz et al. , concluded that rectal bleeding, anemia and significant weight loss are statistically more frequent in older people, whereas symptoms as a rectal bleeding and anemia occur less often in people before the age of 50. Additionally every third person lost weight. Also, Astin et al.  have shown that rectal bleeding has prognostic value in people over 50 years old.
We also analyzed the association of symptoms of colorectal cancer with the gender of patients. According to our results, clinical symptoms did not depend on this parameter. Banaszkiewicz et al.  also examined the relationship of symptoms in patients with colorectal cancer with gender, however, their results also did not confirm this relationship. In turn, Hailton et al.  showed that rectal bleeding occurs more frequently in men over 80 years, whereas this symptom has a low predictive value in women and younger people.
We also examined the association of colorectal cancer symptoms with its localization. The results indicate that the pain reported by patients, pain occuring during physical examination and the presence of pathological resistance are more often associated with the cancer location in colon, but not in rectal. In the case of tumors located in the rectum, admixtures (blood, mucus or mixed) appear more frequently in the stool. Synnestvedt et al.  observed that the presence of blood in the stool and changes in stool consistency are specific for cancers located in the rectum as well as in the left side of the colon. Similar results were obtained by Saidi et al. . In their studies, they noticed that the incidence of rectal bleeding depends on the location of the tumor. In patients with rectal tumors, bleeding was noted four times more often (79% of patients) compared to patients with right colon cancer (21%) and two times more often than in patients with left colon cancer (44%). Banaszkiewicz et al.  showed that pain in patients with colorectal cancer was more common in right-sided lesion. The same authors  also described that constipation was more common in patients with rectal and left colon tumors, and diarrhea most frequently occurred in patients with rectal cancer. In addition, other studies showed that right-sided colorectal cancer is more often associated with the occurrence of anemia [29, 30].
We also analyzed clinical symptoms in correlation with the histological type and the degree of histological differentiation of colorectal cancer. Statistical analysis did not show any correlations. There are also no literature reports in which the above parameters were analyzed.
In addition, in our study we analyzed the relationship between the depth of primary tumor infiltration (T) with the clinical symptoms of colorectal cancer. The results showed that the presence of admixtures and the presence of blood is associated with more advanced tumors (T3 + T4). Also, Banaszkiewicz et al  in their studies showed a significant relationship between the stage of the cancer and symptoms as abdominal pain, bloating, diarrhea, weight loss and obstruction. They found that abdominal pain was more frequent in patients with advanced colorectal cancer. They also showed that weight loss and diarrhea was associated with advancement of cancer. However, Nowaczyk et al.  did not show statistically significant relationships between abdominal pain or blood in the stool and the stage of cancer, but showed that loss of appetite is more common in patients with a more advanced cancers. Different results were obtained by Stapley et al. . Their research proved that rectal bleeding indicates a less advanced cancer. In addition, Kiran et al.  showed that the length of symptoms is not related to cancer advancement. We also examined the association of clinical symptoms of colorectal cancer with metastases to local lymph nodes as well as distant metastases. However, the results of the analysis did not show a statistically significant relationship. There are also no literature data describing these correlations. This may indicate the existence of a relationship between clinical symptoms and local advancement of tumor but not with distant metastases. Therefore, more important are screening tests that enable the detection of cancer at an early stage than analysis of colorectal cancer symptoms.
It is necessary to constantly develop knowledge about the processes occurring during carcinogenesis. The literature presents many possible symptoms that accompany the development of colorectal cancer. Some of them may be associated with specific features of these disease like localization and tumor advancement. It is important to have a knowledge about colorectal cancer symptoms, because their identification can start further diagnostics.
Conflicts of interest
The authors declare that they have no conflicts of interest.
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Niziol M. (1B,C,D), Kostrzewska B. (1B,C,D), Kaminska D. (1B,C,D), Domurat M. (2B,C), Zinczuk J. (3B,C), Misiura M. (4B,C), Guzinska-Ustymowicz K. (1E,F), Pryczynicz A. (*1A,D,E,F)
(1.) Department of General Pathomorphology, Medical University of Bialystok, Poland
(2.) Department of Oncological Surgery, Bialystok Oncology Centre, Poland
(3.) Department of Clinical Laboratory Diagnostics, Medical University of Bialystok, Poland
(4.) Department of Pharmaceutical and Biopharmaceutical Analysis, Medical University of Bialystok, Poland
(A)- Conception and study design; (B) - Collection of data; (C) - Data analysis; (D) - Writing the paper; (E)- Review article; (F) - Approval of the final version of the article; (G) - Other (please specify)
(*) Corresponding author:
Anna Pryczynicz, Department of General Pathomorphology, Medical University of Bialystok, Poland
Table 1. Characteristic of clinical symptoms in colorectal cancer patients Symptoms No. of cases Pain complaints Absent 16 (34.78%) Present 30 (65.22%) Pain characteristic Dull 22 (75.86%) Acute 7 (24.14%) Continuous 7 (26.92%) Intermittent 19 (73.08%) Pain localization Epigastric 5 (20.84%) Umblical 4 (16.66%) Hypogastric 14 (58.34%) All localizations 1 (4.16%) Stool consistency Watery 2 (4.45%) Mushy 15 (33.33%) Formed 28 (62.22%) Colour of stool Yellow 2 (4.44%) Light Brown 5 (11.11%) Brown 26 (57.77%) Dark brown 11 (24.44%) Black 1 (2.22%) Frequency of defecation <1/day 8 (17.77%) 1/day 23 (51.12%) 2/day 1 (2.23%) [greater than or equal to]3/day 13 (28.88%) Admixtures Absent 23 (51.12%) Present 22 (48.88%) Type of admixture Absent 23 (51.12%) Blood 14 (31.11%) Mucus 2 (4.44%) Blood+mucus 6 (13.33%) Painfulness Absent 20 (44.45%) Present 25 (55.55%) Pathological resistance Absent 38 (86.36%) Present 6 (13.63%) Table 2. Correlation between clinical symptoms and tumor localization Symptoms Localization of tumor Colon Rectum p Pain complaints Absent 6 (22.22%) 9 (60.00%) 0.014 Present 21 (77.78%) 6 (40.00%) Admixtures Absent 17 (62.96%) 4 (26.67%) 0.024 Present 10 (37.04%) 11 (73.33%) Painfulness Absent 8 (30.77%) 10 (66.67%) 0.026 Present 18 (69.23%) 5 (33.33%) Pathological resistance Absent 19 (76.00%) 15 (100.00%) 0.040 Present 6 (24.00%) 0 (0.00%) Table 3. Correlation between clinical symptoms and tumor advancement Symptoms T stage T1 + T2 T3 + T4 p Admixtures Absent 0 (0.00%) 13 (100.00%) 0.032 Present 5 (38.46%) 8 (61.54%) Type of Absent 0 (0.00%) 13 (100.00%) <0.001 admixture Blood 1 (12.50%) 7 (87.50%) Mucus 2 (100.00%) 0 (0.00%) Blood+mucus 2 (66.67%) 1 (33.33%)
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|Author:||M., Niziol; B., Kostrzewska; D., Kaminska; M., Domurat; J., Zinczuk; M., Misiura; K., Guzinska-Ustym|
|Publication:||Progress in Health Sciences|
|Date:||Jun 1, 2019|
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