Basal-cell carcinoma
In the United States approximately 3 out of 10 caucasians develop a basal-cell carcinoma during their lifetime. This tumor accounts for approximately 70% of non-melanoma skin cancers. In 80 percent of all cases, basal-cell carcinoma affects the skin of head and neck. Furthermore, there appears to be an increase in the incidence of basal-cell cancer of the trunk in recent years.
Infectious causes of cancer
A virus that can cause cancer is called an "oncovirus". These include human papillomavirus (cervical carcinoma), Epstein-Barr virus (B-cell lymphoproliferative disease and nasopharyngeal carcinoma), Kaposi's sarcoma herpesvirus (Kaposi's Sarcoma and primary effusion lymphomas), hepatitis B and hepatitis C viruses (hepatocellular carcinoma), and Human T-cell leukemia virus-1 (T-cell leukemias). Bacterial infection may also increase the risk of cancer, as seen in "Helicobacter pylori"-induced gastric carcinoma. Parasitic infections strongly associated with cancer include "Schistosoma haematobium" (squamous cell carcinoma of the bladder) and the liver flukes, "Opisthorchis viverrini" and "Clonorchis sinensis" (cholangiocarcinoma).