Why is an HIV infection a risk factor for getting brain cancer?

HIV is a diesease that erodes your immunity system, its like the USA without its missile defense shield. A simple flu or cold can kill you when you have HIV.

Brain cancer is another thing, HIV prevents any mutation protection, so therefore your brain cells can mutate and cause cancer.

Risks factors for brain cancer, such as HIV, have been suggested but not proven. Cancers associated with HIV are Kaposi sarcoma, lymphoma (especially non-Hodgkin lymphoma and primary central nervous system lymphoma) and invasive cervical cancer. Other types of cancer that may be more likely to develop in people with HIV infection are invasive anal cancer, Hodgkin disease, lung cancer, cancer of the mouth, cancer of the testicles, and skin cancers, including basal cell, squamous cell, and malignant melanomas.

Because HIV permutates the genetics of Cluster of Differentiation 4 receptors found in T-helper cells (cells that signal defense mechanism) and makes them useless. In simple terminology, the cells that are suppose to signal your immune system of an invasion can't do it's job because the receptors have been blocked by the HIV virus. As a result, your body is left unprotected from all kinds of diseases, including cancerous cells

It isn't. There are certain infections that can affect the brain, mimicking the symptoms of brain cancer, but it is not actually brain cancer. The infections include toxoplasmosis and PML.

When someone gets HIV (Human Immunodeficiency Virus) it weakens your system and you can get anything really that's why when people get AIDS / HIV they get really sick and at the end they die.

with hiv your immune system doesn't work as well, so the chance of getting any disease is increased

because for people like you, your brain is in your pelvis!