Cervical cancer is the third most common cancer in the world and the leading cause of cancer death among women in developing countries. It is considered a sexually transmitted infection as both squamous cell and adenocarcinoma of the cervix are secondary to infection with HPV, primarily types 16 and 18. Women infected with HIV and with other forms of immunosuppression are at an increased risk for high-risk HPV infection and CIN. Smoking appears to be a cofactor for squamous cell carcinoma (SCC). SCC accounts for approximately 80% of cervical cancers, while adenocarcinoma accounts for 15%, and adenosquamous carcinoma for 3–5%; neuroendocrine or small cell carcinomas are rare.
SCC appears first in the intraepithelial layers (the preinvasive stage, or carcinoma in situ). Preinvasive cancer (CIN III) is most commonly diagnosed in women 25–35 years of age. Two to 10 years are required for carcinoma to penetrate the basement membrane and become invasive. While cervical cancer mortality has declined steadily in the United States due to high rates of screening and improved treatment, the rate of decline has slowed in recent years. In general, Black women experienced much higher incidence and mortality than White women. The 5-year survival rate ranges from 73% for stage II cervical cancer to less than 20% for stage IV.
Early cervical cancer is often asymptomatic. The most common signs are irregular or heavy bleeding and postcoital spotting. Bladder and rectal dysfunction or fistulas and pain are late sequelae.
B. Cervical Biopsy and Endocervical Curettage or Conization
These procedures are necessary steps after a positive Papanicolaou smear to determine the extent and depth of invasion of the cancer. Even if the smear is positive, definitive diagnosis must be established through biopsy before additional treatment is given.
C. “Staging” or Estimate of Gross Spread of Cancer of the Cervix
Staging of invasive cervical cancer is achieved by clinical evaluation, usually conducted under anesthesia as shown in eTable 18–2. Further examinations, such as ultrasonography, CT, MRI, lymphangiography, laparoscopy, and fine-needle aspiration, are valuable for treatment planning.
eTable 18–2.FIGO1 staging of cancer of the cervix. ||Download (.pdf) eTable 18–2. FIGO1 staging of cancer of the cervix.
|Preinvasive carcinoma |
|Stage 0 ||Carcinoma in situ. |
|Invasive carcinoma |
|Stage I ||Carcinoma strictly confined to the cervix. |
|IA ||Invasive cancer diagnosed only by microscopy. |
| ||IA1 Measured invasion of stroma no > 3 mm in depth and no wider than 7 mm. |