Theranostics combines the concepts of therapy and diagnostics into a coordinated approach. In oncology, molecular imaging can identify whether a tumor expresses a particular target, while a therapeutic agent directed at that target may subsequently deliver radiation or another treatment. This approach is designed to connect diagnosis and treatment more closely and can contribute to individualized treatment planning.
Theranostics is being studied and used in selected cancers where reliable molecular targets can be identified. One established example involves prostate-specific membrane antigen, or PSMA, which is commonly expressed at high levels in many prostate cancer cells. PSMA-targeted imaging can help identify disease sites, while PSMA-directed radioligand therapies can deliver radiation to cells expressing the target.
Other applications include neuroendocrine tumors, where somatostatin receptors can serve as molecular targets. Imaging can determine receptor expression and help identify patients who may benefit from receptor-targeted radionuclide treatment.
Key applications include:
A major feature of theranostics is its potential to make treatment decisions more closely dependent on tumor biology. Instead of relying only on the cancer's location or appearance, clinicians can obtain information about specific molecular characteristics. This may help distinguish patients who are more likely to benefit from a targeted treatment.
Theranostics can also support more personalized approaches because diagnostic imaging may provide information before treatment begins and during follow-up. However, its suitability depends on factors such as tumor characteristics, target expression, previous treatments, overall health, and the availability of appropriate therapies.
Important areas of development include:
Theranostics represents an important development in precision oncology because it links molecular diagnosis with targeted treatment. Its applications are currently strongest in cancers with well-defined molecular targets, while research continues to expand its potential to other tumor types. As imaging technologies, radiopharmaceuticals, and molecular research advance, theranostics may become increasingly relevant to individualized cancer treatment. However, treatment decisions should always be based on clinical evaluation and guidance from qualified healthcare professionals.