Common Misconceptions

Misconception: "Monoclonal antibodies are a type of vaccine."

Reality: Vaccines stimulate the patient's own immune system to produce antibodies and memory cells. Monoclonal antibodies are manufactured antibodies given directly to the patient — the patient's immune system is not involved in producing them. Vaccines provide active, long-lasting immunity. Monoclonal antibody treatments provide passive, temporary immunity or targeted therapeutic effects. They are entirely different approaches used for different purposes.

Misconception: "Monoclonal antibodies are produced directly from humans."

Reality: The production process begins in mice, not humans. A mouse is immunised with the target antigen. B cells are extracted from the mouse's spleen and fused with mouse myeloma cells. This can cause problems because "mouse" antibodies can be recognised as foreign by the human immune system and trigger an immune reaction. Modern techniques create "humanised" antibodies by replacing the mouse portions with human sequences, leaving only the antigen-binding variable region from the mouse.

Misconception: "A positive pregnancy test means the antibody detected the embryo."

Reality: The antibody does not detect the embryo itself. It specifically detects hCG, a hormone produced by the trophoblast (early placental tissue) after implantation. The antibody's target is the hCG molecule in urine. This is why the test can be positive before the embryo is even visible on a scan — it detects the biochemical signal (hCG) that the implanted embryo is producing, not the embryo directly.

Misconception: "Monoclonal antibody cancer treatments destroy all cancer cells immediately."

Reality: Monoclonal antibody cancer treatments are not instant cures. They work by finding cancer cells that express the target antigen, but cancer cells are genetically unstable and can mutate their surface proteins to escape antibody targeting. Treatments must often be combined with chemotherapy or radiation. Response varies between patients. Some cancers do not express the target antigen, making the treatment ineffective. Monoclonal antibody treatments represent a major advance but are not universally applicable or curative.