概述
Anal cancer originates in the anus, the opening at the end of the digestive tract. It is relatively rare but increasing in incidence, especially in individuals with HPV infection. The most common type is squamous cell carcinoma.
症状
- Rectal bleeding
- Anal pain or pressure
- Lump or mass near the anus
- Itching or discharge from the anus
- Changes in bowel habits (e.g. narrowing of stool)
- Swollen lymph nodes in the groin
病因与风险因素
- HPV infection (especially HPV types 16 and 18)
- Receptive anal intercourse
- Smoking
- Weakened immune system (e.g., HIV)
- History of cervical, vaginal, or vulvar cancer
- Age >50
诊断方法
- Digital rectal exam (DRE)
- Anoscopy or proctoscopy with biopsy
- Imaging: MRI, CT scan, PET-CT
- HPV and HIV testing
治疗方案
- Chemoradiation therapy (standard of care for most)
- Surgery (reserved for small tumors or treatment failure)
- Chemotherapy (in advanced or metastatic disease)
- Immunotherapy (in select recurrent/metastatic cases)
预后情况
- Highly treatable, especially in early stages
- 5-year survival rate:
- Localized: ~82%
- Regional: ~67%
- Distant: ~35%
与此类癌症共处
- Managing radiation side effects (skin irritation, bowel issues)
- Pain relief and anti-inflammatory treatments
- Regular follow-ups with anoscopy and imaging
- Emotional and sexual health support
预防与筛查
- HPV vaccination
- Safe sex practices
- Routine screening for high-risk groups (e.g., HIV-positive individuals)
FAQs
Q: Is anal cancer the same as rectal cancer?
A: No. They involve different parts of the digestive tract and have distinct treatment approaches.
Q: Can anal cancer be cured?
A: Yes. Many cases are cured with combined chemoradiation.
Q: Who should be screened?
A: High-risk individuals such as those with HIV or history of HPV-related diseases.
相关资源
- Anal Cancer Foundation
- American Society of Colon and Rectal Surgeons
- ClinicalTrials.gov
