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Light Against Cancer: How Photodynamic Therapy Targets Tumors While Supporting Healthy Tissue

Michael Karlfeldt
Michael Karlfeldt

TV Show Host, True Health: Body, Mind, Spirit

Robert Weber, MSc
Robert Weber, MSc

Managing Director, W Medical Systems GmbH

What if light could be used not simply to stimulate healing—but to selectively target cancer tissue?

In this cutting-edge conversation, Robert Weber of Weber Medical explains how photodynamic therapy (PDT) combines specialized photosensitizers with specific wavelengths of laser light to create a targeted oxidative reaction inside tumor tissue.

You’ll discover how advanced photosensitizers such as ICG can be delivered systemically and activated with red or infrared laser light, why deeper wavelengths matter for tumors below the surface, and how fiber-optic laser technology can bring light directly into difficult-to-reach areas.

Robert also explains the complementary role of photobiomodulation, including its potential to support mitochondrial energy production, microcirculation, immune activity, detoxification, and tissue regeneration—while photodynamic therapy places selective stress on cancer cells.

You’ll also hear how this same platform is being explored for chronic infections, circulating pathogens, brain applications, and at-home maintenance, making light one of the most versatile tools emerging in integrative medicine.

This conversation offers a very different way to think about cancer treatment:

Can we increase pressure on the tumor while simultaneously helping the rest of the body become stronger?

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