Cervical Cancer: An Overview of Introduction, Types, Pathogenesis, Lab Diagnosis, Treatment, Prevention, and Keynotes

Introduction

Cervical cancer is a malignant neoplasm of the cervix, most commonly arising from the transformation zone of the cervix. It is one of the leading causes of cancer-related morbidity and mortality among women, especially in low- and middle-income countries. Persistent infection with high-risk Human Papillomavirus (HPV) is the primary etiological factor.

Types of Cervical Cancer

1. Squamous Cell Carcinoma (≈70–80%)

• Originates from the ectocervical squamous epithelium

2. Adenocarcinoma (≈15–25%)

• Arises from the endocervical glandular epithelium

3. Adenosquamous Carcinoma

4. Rare Types

• Neuroendocrine carcinoma
• Clear cell carcinoma

Pathogenesis

• Persistent infection with high-risk HPV types (16, 18, 31, 33, 45)
• Viral oncoproteins E6 and E7 inactivate p53 and RB tumor suppressor genes
• Progression from Cervical Intraepithelial Neoplasia (CIN I–III) to invasive carcinoma
• Genetic instability, dysregulated cell cycle, and angiogenesis lead to malignant transformation

Laboratory Diagnosis

• Pap smear (Papanicolaou test) – screening test
• HPV DNA testing – detection of high-risk HPV strains

• Colposcopy with directed biopsy
• Histopathology – confirmation and grading
• Immunohistochemistry – p16, Ki-67
• Imaging (MRI/CT/PET) – staging

Treatment

• Early stages: Conization, hysterectomy
• Locally advanced disease: Radiotherapy with concurrent chemotherapy (cisplatin)
• Advanced/metastatic disease: Chemotherapy, targeted therapy, immunotherapy
• Supportive care for symptom control

Prevention

• HPV vaccination (bivalent, quadrivalent, nonavalent vaccines)
• Regular cervical screening (Pap smear/HPV testing)
• Safe sexual practices
• Smoking cessation
• Public awareness and early detection programs

Keynotes

• HPV infection is the central cause of cervical cancer.
• A Pap smear is an effective screening tool for cervical cancer.
• Vaccination can prevent most cases.
• Early-stage disease has an excellent prognosis.
• Combined screening and vaccination have a significant impact on reducing the disease burden.

Further Readings

1. https://www.who.int/news-room/fact-sheets/detail/cervical_cancer
2. https://my.clevelandclinic.org/health/diseases/12216-cervical_cancer
3. https://www.who.int/news-room/fact-sheets/detail/human-papilloma-virus-and-cancer
4. https://www.cancer.gov/types/cervical/causes-risk-prevention
5. https://www.mayoclinic.org/diseases-conditions/cervical_cancer/symptoms-causes/syc-20352501
6. https://www.cancer.org.au/cancer-information/types-of-cancer/cervical_cancer
7. https://www.ncbi.nlm.nih.gov/books/NBK572321
8. https://www.epocrates.com/online/diseases/25924/Cervical_cancer/Etiology
9. https://www.cancer.org/cancer/types/cervical_cancer/about/what-is-cervical_cancer.html
10. https://flcancer.com/articles/cervical_cancer-summary-symptoms-treatments