Targeted and Immune Therapy for Colorectal Cancer
Overview of Colorectal Cancer
Colorectal cancer is a type of gastrointestinal cancer which poses significant challenges from a clinical perspective. The traditional treatment process mainly includes surgery along with chemotherapy. However, unresectable or metastatic CRC produces a complex challenge which requires the development of innovative treatment strategies. Targeted therapy & Immunotherapy is an emerging technique which is the cornerstone of treatment in such cases. The interventions are tailored to specific molecular attributes in this case. Furthermore, immunotherapies have created a revolution in cancer treatment with the help of harnessing the immune system to combat malignant cells. The new tools have helped the colorectal cancer specialists in Kolkata to apply them on the patients and cure them effectively.
Also read: Risk Factors for Colon Cancer – Lifestyle and Genetics Explained!
The colorectal cancer has mainly five stages such as – Stage 0, Stage 1, Stage 2, Stage 3 and Stage 4.
Stage 0 Cancer
In this stage, the cancer cells are present but only in the inner lining in the colon or rectum. Surgery is the only treatment available and is the only treatment required.
Stage 1 Cancer
The cancer grows in the deeper layers of the colon or rectum wall but has not developed beyond them. Surgery can remove the cancer tissue and if any high-grade tumors are present nearby, healthy tissue is also removed.
Stage 2 Cancer
The cancer has developed through the wall of intestines and started spreading to nearby tissues. Surgery is the standard treatment procedure for this stage of cancer which is often preceded by a neoadjuvant therapy such as chemotherapy or immunotherapy if the tumor is aggressive.
Stage 3 Cancer
The cancer has developed to nearby organs and lymph nodes. Surgery along with adjuvant chemotherapy is applied to remove the remaining cancer cells. Radiation may be used if cancer has spread to nearby organs or if surgery isn’t an option.
Stage 4 Cancer
The cancer has reached multiple organs in this stage such as liver, lungs, brain, or peritoneal cavity. The treatment options are very much limited in this stage of cancer. The doctors treat this cancer with systemic chemotherapy. They administer chemotherapy before surgery to shrink tumors and follow it with surgery if feasible.
New Colorectal Cancer Treatments
The targeted therapies and immunotherapies are creating revolution in colorectal cancer treatment. The development in the research has deepened our understanding on this topic, revealing crucial proteins, signaling molecules, and pathways that drive cancer growth and spread. It has ultimately helped in the development of more accurate drugs which target these specific mechanisms and enhance treatment efficiency. It has become easy for colorectal cancer specialist doctors to use these drugs and provide proper treatment to the patients. The targeted therapies focus on some certain molecules or pathways which helps it grow. For example, drugs like Bevacizumab and Ramucirumab focus on blocking new blood vessel development, which is important for tumor growth.
There are also other drugs such as Cetuximab which targets special protein receptors to stop the tumor cell division and growth. These treatments can be used alone, in combination with chemotherapy, or with other targeted drugs. With the advancement in research, there are newer therapies developing such as Regorafenib or Encorafenib. Regorafenib helps to block multiple signaling pathways which the tumors use for their survival. Encorafenib targets specific mutations and attacks the abnormal BRAF proteins found in CRC cells. These advancements indicate significant development in tailoring treatments to individual cancer profiles which offers hope for the more efficient outcomes in colorectal cancer management.
The advancement of immunotherapy has also provided new opportunities to tackle cancer. It leverages the defense system of the body to fight cancer. It offers more targeted, durable responses with fewer side effects. The continuation for the efforts in the area of immunotherapy are now becoming suitable among the patients and specific types of colorectal cancer are entirely curable with immunotherapy.
Immune Checkpoint Inhibitors for Colorectal Cancer: A Breakthrough Treatment
One of the most efficient immunotherapies for colorectal cancer are immune checkpoint inhibitors. These drugs release the brakes on immune cells which enable them to attack cancer. These inhibitors are specifically successful in tumors with mismatch repair deficiency or high microsatellite instability. These genetic features cause an accumulation of mutations which makes tumors more visible to the immune system. These types of colorectal cancer tumors account for about 15-18% of stage II, 9-10% of stage III, and 4-5% of stage IV cases.
Immunotherapy can treat some types of colorectal cancer safely and efficiently. Keytruda (pembrolizumab) is now FDA approved as a first line treatment for metastatic colorectal cancer which are MSI-H/dMMR. Along with CRC, a PD-1 inhibitor, Keytruda now has 40 FDA approvals for treating 18 different cancer types.
CAR-T Cell Therapy for Colorectal Cancer: A Promising Frontier
Another important therapy which is useful for colorectal cancer treatment is Chimeric Antigen Receptor T-cell (CAR-T) therapy. The colorectal cancer specialist doctors have started to implement it to cure the patients. It involves engineering a patient’s T cells to specifically target cancer cells. Although it is at present approved for only blood cancers such as leukemia and lymphoma, the clinical trials are suggesting a promising sign for colorectal cancer. A novel CAR-T therapy, GCC19CART, recently demonstrated an 80% response rate in a small group of patients with refractory metastatic colorectal cancer. With the advancement of research and development, it can provide new hope for the colorectal cancer patients who are not responsive to other treatment procedures.
Conclusion
Colorectal cancer treatment has evolved significantly which offers more options than before. Surgery, Chemotherapy and radiation are still vital but the newer treatments such as targeted therapy and immunotherapy are creating a huge difference. Immune checkpoint inhibitors and CAR-T cell therapy are providing hope for the patients with advanced or hard-to-treat CRC. Along with it, early detection and a healthy lifestyle are the best methods to prevent colorectal cancer. With continued research and medical advancements, the future of colorectal cancer treatment looks brighter, bringing new hope to patients and their families.
