Abstract
Colorectal cancer (CRC) is the third most common cancer overall. CRC could be sporadic, which is most common at 70% of CRC, inherited (5%), and familial (25%). The most common genes that are affected in CRC are oncogenes, tumor suppressor genes, and genes related to the DNA repair mechanisms. Structural screening tests (such as colonoscopy, sigmoidoscopy) are superior to stool tests. Studies have shown that colonoscopy has reduced the incidence of CRC by 67% and case fatality rate by 65%. Microsatellite instability (MSI), chromosomal instability (CIN), and CpG island methylator phenotype (CIMP) are the major mutations that occur in CRC. These can also act as biomarker, which could be detected in stool, blood, or tumor biopsy. Based on patient characteristics and tumor features, CRC patients could be divided into four groups (from Group 0 to Group 3). First-line chemotherapeutic agents for adjuvant chemotherapy are FOLFOX (5-FU/LV/Oxaliplatin) or capecitabine/LV/oxaliplatin. Palliative chemotherapy options involve 5-FU with leucovorin, capecitabine alone, FOLFOX or FOLFIRI regiments (5-FU/LV/irinotecan). Efficacy of combination regimens are enhanced by the use of monoclonal antibodies such as anti-VEGF (bevacizumab) and anti-EGFR (cetuximab, panitumumab). Some of the alternative treatments currently ongoing are discussed in this chapter. These include agarose tumor microbeads where tumor growth inhibitory factor causing a negative inhibitory signal is found to slow the tumor growth. Chronic inflammatory products such as cytokines, chemokines, reactive oxygen species (ROS), reactive nitrogen species, and arachidonic acid derivatives are risk factors for CRC, and COX inhibitors such as NSAIDs could have some effect prophylactically and for treatment against CRC. Probiotics could act on CRC possibly by apoptosis of diseased cells and also possibly by antioxidant effect. Functional foods containing polyphenols could reduce ROS, thereby reducing CRC by maintaining a balance between ROS and antioxidants. Metal-based drugs such as platinum-based agents (like carboplatin, oxaliplatin) and gold-based drugs (such as auranofin) also exerts antitumor effect, possibly through platinum-DNA adducts and ROS, respectively.
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Abbreviations
- BMI:
-
Body mass index
- CAPOX:
-
Capecitabine/LV/oxaliplatin
- CIMP:
-
CpG island methylator phenotype
- CIN:
-
Chromosomal instability
- COX:
-
Cyclooxygenase
- COXibs:
-
Cyclooxygenase-2 inhibitor
- CRC:
-
Colorectal carcinoma
- CT:
-
Computerized tomography
- CVD:
-
Cardiovascular disease
- DNA:
-
Deoxyribonucleic acid
- EGFR:
-
Epidermal growth factor receptor
- FAP:
-
Familial adenomatous polyposis
- FBLN1:
-
Fibulin
- FOLFIRI:
-
5-FU/LV/irinotecan
- FOLFOX:
-
5-FU/LV/oxaliplatin
- GLOBOCAN:
-
Global Cancer Observatory
- GSN:
-
Gelsolin
- KRAS:
-
Kirsten rat sarcoma viral oncogene homolog
- MSI:
-
Microsatellite instability
- NCL:
-
Nucleolin
- NSAIDs:
-
Non-steroidal anti-inflammatory drugs
- PEBP1:
-
Phosphatidylethanolamine-binding protein
- PEDF:
-
Pigment epithelium-derived factor
- PRDX1:
-
Peroxiredoxin-1
- PSAP:
-
Prosaposin
- RENCA:
-
Renal cortical adenocarcinoma cell line (mouse)
- RNA:
-
Ribonucleic acid
- RON:
-
Reactive nitrogen species
- ROS:
-
Reactive oxygen species
- Serbp1:
-
Serpine1
- SPARC:
-
Secreted protein, acidic, and rich in cysteine
- TIMP2:
-
Tissue inhibitor of metalloproteinase 2
- USPSTF:
-
United States Preventive Services Task Force
- VEGF:
-
Vascular endothelial growth factor
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Ullah, F., Mani, H., Wazir, M., Hussain, S., Ali, S., Ahmad, S. (2022). Updates on Clinical Trials in Diagnosis and Therapy of Colorectal Cancer. In: Shukla, D., Vishvakarma, N.K., Nagaraju, G.P. (eds) Colon Cancer Diagnosis and Therapy Vol. 3. Springer, Cham. https://doi.org/10.1007/978-3-030-72702-4_1
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