HIV-Associated Malignancies and Lymphoma
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Direct answer
HIV-associated malignancies are cancers whose risk rises with immunodeficiency, and the AIDS-defining ones are Kaposi sarcoma, non-Hodgkin lymphoma and invasive cervical cancer. Primary CNS lymphoma, often linked to Epstein-Barr virus and presenting as a ring-enhancing brain lesion, is one of the most important lymphomas in advanced disease. Anal cancer and Hodgkin lymphoma are not AIDS-defining, yet their risk is clearly raised and they need attention in routine care.
What you must remember
- AIDS-defining cancers: Kaposi sarcoma, non-Hodgkin lymphoma and invasive cervical cancer, all of which mark advanced immunodeficiency.
- Kaposi sarcoma: caused by human herpesvirus 8, presenting as violaceous skin nodules and sometimes with visceral disease, with ART as the cornerstone of treatment.
- Primary CNS lymphoma: usually seen at low CD4 counts, presenting as a ring-enhancing lesion, with toxoplasmosis as the main mimic.
- Aggressive B-cell lymphomas: Burkitt lymphoma with MYC translocation and diffuse large B-cell lymphoma, which are often extranodal and need intensive chemotherapy.
- Cervical cancer: HPV-driven and AIDS-defining when invasive, so screening by cytology or HPV testing is part of routine care.
- Anal cancer: HPV-associated and not AIDS-defining, but risk is raised, and anal cytology screening is used in high-risk groups.
- ART: restoring immune function reduces the incidence of Kaposi sarcoma and lymphoma, and it is combined with specific cancer treatment.
Working up a new mass in a patient with HIV
A new mass in a patient with HIV needs a sequence of tests, because toxoplasmosis and lymphoma can look alike on imaging. The steps below move from the risk assessment to the choice between trial and biopsy.
- Check the CD4 count and ART history: a low CD4 count and missed antiretroviral doses raise the chance of lymphoma and other opportunistic lesions.
- Image the lesion: a ring-enhancing brain lesion needs MRI, while a suspected nodal or extranodal mass needs imaging to plan the biopsy site.
- Test for toxoplasma and EBV: toxoplasma IgG serology helps, and EBV DNA in CSF supports primary CNS lymphoma, but it does not replace biopsy.
- Decide between trial and biopsy: a short trial of toxoplasma therapy may be used for suspected toxoplasmosis, but a failure to respond within about two weeks means tissue diagnosis.
- Confirm the subtype: histopathology with immunophenotyping defines the lymphoma subtype, and treatment is planned with a specialist team alongside ART.
- Screen for other cancers: cervical and anal screening is part of routine HIV care for women and high-risk groups, following national programme guidance.
Where the exam tries to catch you
Examiners test whether the student separates AIDS-defining cancers from cancers that are only more common in HIV, and whether the student avoids treating every brain lesion as toxoplasmosis. The traps below are the errors that cost marks most often here.
- Trap: a ring-enhancing lesion in HIV is always toxoplasmosis Correct: primary CNS lymphoma is the key alternative, so a trial of toxoplasma therapy is reviewed and a biopsy follows if the lesion does not respond.
- Trap: Hodgkin lymphoma and anal cancer are AIDS-defining Correct: only Kaposi sarcoma, non-Hodgkin lymphoma and invasive cervical cancer are AIDS-defining, while Hodgkin lymphoma and anal cancer carry a raised risk without that status.
- Trap: Kaposi sarcoma is treated with chemotherapy alone Correct: ART is the cornerstone, since immune restoration often causes regression, with chemotherapy reserved for advanced or visceral disease.
Frequently asked questions
Which cancers are AIDS-defining in HIV infection?
Kaposi sarcoma, non-Hodgkin lymphoma and invasive cervical cancer are the AIDS-defining cancers in HIV infection. Their presence marks advanced immunodeficiency, and they are managed together with antiretroviral therapy.
What is one of the most important lymphomas in advanced HIV disease?
Primary CNS lymphoma is one of the most important lymphomas in advanced HIV disease, and it is often linked to Epstein-Barr virus. It presents as a ring-enhancing brain lesion, and toxoplasmosis is the main mimic that must be excluded.
Which virus causes Kaposi sarcoma in people with HIV?
Human herpesvirus 8, also called Kaposi sarcoma-associated herpesvirus, causes Kaposi sarcoma in people with HIV. Its lesions are violaceous skin nodules, and antiretroviral therapy is the cornerstone of treatment.
Why is cervical cancer screening important in women with HIV?
Cervical cancer screening is important in women with HIV because HIV raises the risk of HPV persistence and cervical neoplasia, and invasive cervical cancer is AIDS-defining. Regular screening by cytology or HPV testing, as per national programme guidance, allows early detection.
How does antiretroviral therapy affect HIV-associated malignancies?
Antiretroviral therapy reduces the incidence of Kaposi sarcoma and lymphoma by restoring immune function, and it is combined with specific cancer treatment. Immune restoration often shrinks Kaposi sarcoma, but chemotherapy is still needed for advanced or visceral disease.