Which type of Human papilloma virus is most commonly associated with Cervical cancer ?
**Core Concept**
Human papillomavirus (HPV) is a significant cause of cervical cancer, with certain high-risk types being more commonly associated with this malignancy. HPV infection can lead to the development of cervical intraepithelial neoplasia (CIN), which may progress to invasive cervical cancer if left untreated.
**Why the Correct Answer is Right**
HPV 16 is the most common high-risk HPV type associated with cervical cancer, responsible for approximately 55-60% of all cervical cancer cases worldwide. This is due to its ability to integrate into the host genome and express the E6 and E7 oncogenes, leading to the disruption of normal cellular processes and promoting tumor development. The E6 protein of HPV 16 can bind to and degrade p53, a crucial tumor suppressor protein, while the E7 protein can bind to retinoblastoma protein (Rb) and promote cell cycle progression.
**Why Each Wrong Option is Incorrect**
**Option B:** HPV 24 is a low-risk HPV type primarily associated with genital warts and is not commonly linked to cervical cancer.
**Option C:** HPV 32 is not a well-characterized HPV type, and there is limited evidence to support its association with cervical cancer.
**Option D:** HPV 36 is also a low-risk HPV type that has been linked to genital warts but not cervical cancer.
**Clinical Pearl / High-Yield Fact**
HPV vaccination is a crucial preventive measure against cervical cancer, and the quadrivalent HPV vaccine (Gardasil) protects against HPV types 16 and 18, which together account for approximately 70% of all cervical cancer cases.
**✓ Correct Answer: A. HPV 16**