Acquired Immonodeficiency syndrome (AIDS) is a potentially life threatening condition caused by Human Immunodeficiency Virus (HIV) and is transmitted from human to human as a sexually transmitted disease, contact with infected blood and from mother to child during pregnancy, childbirth and breast feeding . HIV damages the immune system of the human body and thus we have less ability or inability to fight any infection and disease. As of date there is no cure for HIV / AIDS but we have surely been able to halt the progression of the disease with effective medicines.
As we all know that our innate immunity plays a major role in the initiation and progression of cancer in the human body and therefore it does not come as a surprise that HIV / AIDS comes with the rider of increased susceptibility to different types and forms of cancer. AIDS – related cancer refers to any cancer which is more likely to occur in a person who is infected with HIV. The list includes, but is not limited to, Kaposi’s sarcoma (KS), Lymphoma including Non- Hodgkin’s Lymphoma (NHL) and Hodgkin’s Lymphoma (HL / HD), Cervical cancer and cancers of the mouth, throat, liver, lung and anus. This list can further be extended to angiosarcoma, penile cancer, testicular cancer, colorectal cancer and different varieties of skin cancer including basal cell carcinoma (BCC), squamous cell carcinoma (SCC) and melanoma. Of these a trio of cancers namely, KS, NHL and cervical cancer are referred to as AIDS defining cancers meaning thereby that development of any of these cancers in a HIV positive patient signifies the progression of HIV positivity to full blown AIDS. This trio of cancers is described below
- Kaposi’s Sarcoma – Kaposi’s sarcoma is a soft tissue sarcoma (sarcoma = cancer arising from the connective tissue of the body) which can be divided into endemic KS and epidemic KS. Endemic KS is unrelated to HIV / AIDS and has been traditionally associated with young African males, having a Jewish or Mediterranean descent or persons who are on immunosuppressive therapy following an organ transplantation. Epidemic KS is associated with HIV / AIDS and typically so with homosexual men with HIV / AIDS associated with Human Herpesvirus (HHV) type 8 infection.
- Non – Hodgkin’s Lymphoma – The lymphatic system is a network of lymph vessels and lymph nodes in the human body which carries a colourless ultrafiltrate of the blood called lymph which typically contains lymphocytes – a type of white blood cell. The lymphatic system has an important role to play in the defence mechanism of our body. Apart from the lymphatic channels and the lymph nodes, the spleen (filters blood and makes lymphocytes), the thymus, the tonsils and the bone marrow also form part of the lymphatic system. NHL is a type of cancer of the lymphatic system where the healthy cells of the lymphatic system multiply rapidly, grow out of control and may or may not form a tumour. Although there are many different types of NHL, the ones which are most commonly associated with HIV / AIDS are aggressive B cell lymphomas specially diffuse large B cell lymphoma (DLBCL) and Burkitt’s lymphoma; primary central nervous system lymphoma (Primary CNS lymphoma) affecting the brain and Primary effusion lymphoma which causes fluid accumulation around the lungs (pleural effusion), heart (pericardial effusion) and abdominal cavity (ascites).
- Cervical cancer / Cancer of the uterine cervix – Uterine cervix which is commonly known as cervix is the lowermost part of the uterus which projects out into the vaginal cavity and thus forms the birth canal. Women with HIV / AIDS have a higher propensity to develop a precancerous condition of the cervix known as cervical intraepithelial neoplasia (CIN). There are different grades of CIN and its association with Human Papilloma Virus (HPV); mainly type 16 and 18; has been proved conclusively. A high grade CIN (CIN – III) can progress to an invasive cervical cancer. Typically it takes decades for a CIN to progress to an invasive cervical cancer but a co-infection with HIV / AIDS can hasten the process of development and progression to invasive cancer to mere some years.
The management and treatment of AIDS – related cancers is no different from accepted treatment protocols for these cancers without the association of HIV / AIDS but we have to additionally treat the HIV / AIDS simultaneously and be extra vigilant about the additional immunosuppression due to the cancer, the disease (HIV / AIDS) and that induced by the treatment.
written by Dr. Partha Mukhopadhyay
