Virus associated with cancer cervix:
**Core Concept**
Human papillomavirus (HPV) is a DNA virus that causes persistent infection in cervical epithelial cells, leading to malignant transformation and development of cervical cancer. HPV infection is a major risk factor for cervical carcinoma, with certain high-risk genotypes (e.g., HPV 16 and 18) associated with increased cancer risk.
**Why the Correct Answer is Right**
HPV infects the cervical epithelial cells through microabrasions, leading to integration of viral DNA into the host genome. The viral oncogenes (E6 and E7) inactivate the tumor suppressor proteins p53 and Rb, respectively, thereby promoting cell proliferation and inhibiting apoptosis. This results in the development of high-grade dysplasia and eventually invasive carcinoma. The presence of HPV DNA in cervical cancer tissue is a critical diagnostic criterion for the disease.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because HPV is not associated with other types of cancer, although it can cause other types of anogenital and oropharyngeal cancers.
**Option B:** This option is incorrect because Hepatitis B virus (HBV) is associated with hepatocellular carcinoma, not cervical cancer.
**Option C:** This option is incorrect because Human Immunodeficiency Virus (HIV) is associated with various opportunistic infections and cancers, but not directly with cervical cancer.
**Clinical Pearl / High-Yield Fact**
HPV vaccination is an effective measure in preventing cervical cancer, and it is recommended for females aged 9-26 years. The vaccine provides immunity against the high-risk HPV types 16 and 18, which are responsible for 70% of cervical cancer cases.
**Correct Answer: C. Human Papillomavirus (HPV)**