How Are Treatment Decisions Made in Precision Oncology?

Why Modern Cancer Medicine Combines Diagnostics, Clinical Guidelines, and Individual Tumor Biology

For many patients, cancer treatment begins with a seemingly simple question: Which therapy is best? Today, the answer is considerably more complex than it was only a few years ago.

Modern oncology is no longer guided solely by the type of tumor or the stage of disease. Increasingly, the molecular characteristics of a tumor help determine which treatment may be more likely to provide clinical benefit.

This development is known as precision oncology. Its aim is not to replace standard therapies, but to tailor scientifically established treatments more precisely to the individual disease. Every treatment decision remains grounded in the available clinical evidence — complemented by advanced diagnostics and the specific biological characteristics of the tumor.

Treatment Decisions Begin with Comprehensive Diagnostics

Every tumor has its own genetic and molecular characteristics. As a result, even patients with the same diagnosis may respond very differently to the same treatment.

International professional organizations such as the European Society for Medical Oncology (ESMO), the American Society of Clinical Oncology (ASCO), and the National Comprehensive Cancer Network (NCCN) recommend molecular diagnostics for numerous advanced cancers when the findings may have therapeutic implications.

Depending on the clinical question, a range of advanced diagnostic methods may be used:

• Histopathological examinations:
  Conventional microscopic analysis of tumor tissue
• Molecular tumor profiling and biomarker analysis:
  Identification of specific proteins, biomarkers, or oncogenic driver mutations
• Next-generation sequencing (NGS):
  Parallel analysis of numerous genes or selected regions of the tumor genome
• Liquid biopsy:
  Advanced blood-based testing for circulating tumor cells or tumor DNA

Learn more here about the diagnostic capabilities of the Hallwang Clinic and the process of molecular tumor analysis.

Clinical Guidelines: The Scientific Foundation

A common misconception is that precision oncology represents an alternative to guideline-based medicine. In fact, international clinical guidelines remain the essential foundation of every treatment decision, as they systematically summarize the current state of scientific evidence. Increasingly, these guidelines also incorporate recommendations for molecular testing and the targeted therapies linked to specific biomarkers.

However, because clinical guidelines define general standards, they cannot reflect every individual patient situation. Differences in tumor biology, rare mutations, previous treatments, or coexisting medical conditions often require highly specialized medical interpretation.

Precision oncology therefore expands the evidence-based framework by adding valuable biological detail that may help support more individualized treatment decisions.

Not Every Molecular Alteration Is a Therapeutic Target

Not every genetic alteration identified in a tumor is suitable as a treatment target. Diagnostic findings must therefore be interpreted carefully within the context of the available scientific evidence.

For this purpose, the ESMO Precision Medicine Working Group developed the ESCAT classification — the ESMO Scale for Clinical Actionability of Molecular Targets. It categorizes molecular alterations according to the strength of the clinical evidence supporting their use as therapeutic targets.

This framework helps assess which molecular alterations may reasonably be expected to respond to a targeted therapy based on the available evidence.

An overview of modern cancer treatments available at the Hallwang Clinic can be found here.

What Role Do Off-Label Therapies Play?

In precision oncology, a molecular alteration may be identified for which a potentially suitable medication already exists, even though the drug is not formally approved for the patient’s specific tumor type.

When a medication is used outside the indications covered by its official authorization, this is referred to as off-label use.

Modern clinical guidelines increasingly take tumor-agnostic biomarkers into account. If molecular analysis identifies a potential target for which there is credible evidence of clinical benefit, the option of off-label treatment may be evaluated individually following a careful review of the available studies and a thorough assessment of potential benefits and risks.

The circumstances in which off-label therapies may be medically appropriate are explained in greater detail in this background article.

The Path to an Individual Treatment Decision

Modern precision oncology does not follow a trial-and-error approach. Instead, it is based on a structured and scientifically grounded evaluation process.

A well-founded treatment decision considers not only the tumor type and stage of disease, but also the molecular characteristics of the tumor, previous therapies, coexisting medical conditions, and the patient’s overall health.

This information is assessed in relation to international clinical guidelines, current clinical trial data, and the available scientific evidence. Complex cases are often reviewed by an interdisciplinary medical team. When a proposed treatment differs from the established standard of care, this decision should be based on a clear medical rationale and a careful, individualized assessment of potential benefits and risks.

Precision Oncology at the Hallwang Clinic

At the Hallwang Clinic, the close integration of advanced diagnostics, international clinical guidelines, and individual tumor biology forms the foundation of treatment planning.

Our interdisciplinary medical team reviews each patient’s medical records, recommends further molecular investigations where appropriate, and evaluates all potentially relevant treatment options.

The objective is always to develop a transparent and scientifically grounded treatment concept tailored as precisely as possible to the patient’s individual clinical situation.

Would You Like Your Individual Treatment Options to Be Reviewed?

A precise treatment decision requires a careful evaluation of all available medical findings.

The Hallwang Clinic offers national and international patients an individualized review of their medical records, together with a comprehensive assessment of potentially relevant diagnostic and therapeutic options.