Mohs Surgery vs Superficial Radiation Therapy (SRT) for Skin Cancer Treatment in Bridgewater, NJ
If you or someone you know has been diagnosed with non-melanoma skin cancer, the treatment conversation can feel overwhelming. You may have heard about two very different approaches: Mohs micrographic surgery (MMS) and superficial radiation therapy (SRT). Both are used to treat basal cell carcinoma and squamous cell carcinoma, but they differ significantly in cure rates, number of visits, side effects, and long-term outcomes. Understanding those differences is essential before making a decision. Here at PS Dermatology and Surgery in Bridgewater, NJ, we want to make sure patients are aware of the differences so they can make an informed choice with confidence.
What Is Mohs Surgery and How Does It Work?
Mohs surgery is a precise surgical technique considered the gold standard for treating many non-melanoma skin cancers. During the procedure, a specially trained Mohs surgeon removes thin layers of cancerous tissue one at a time, examining each layer under a microscope before proceeding. This process continues until no cancer cells remain. Because 100% of the surgical margin is evaluated through frozen section histology, Mohs surgery provides pathologic confirmation that the cancer has been completely removed.
The key advantages of this approach include tissue preservation (only cancerous tissue is removed, sparing healthy skin) and completion in a single visit (sometimes second visit). According to the American Academy of Dermatology, and also supported by the College of Mohs Surgery, and American Cancer Society, Mohs surgery is recognized as the most effective treatment option with the highest published cure rates for appropriate skin cancers. The wound is often repaired the same day (although sometimes on a second day), and long-term cosmetic outcomes are generally considered favorable because of the tissue-sparing technique and precision reconstruction. Mohs Surgery is typically covered by insurance.
What Is Superficial Radiation Therapy (SRT)?
Superficial radiation therapy is an X-ray based treatment that delivers targeted radiation to the skin's surface to destroy cancer cells. Unlike Mohs surgery, SRT does not involve cutting or stitches. However, it requires multiple treatment sessions, typically ranging from 15- 20 visits depending on the provider and the tumor. SRT does not provide pathologic confirmation that all cancer cells have been eliminated. Instead, "disease control" is determined through clinical examination or ultrasound imaging.
National Cancer Guidelines, do not recommend SRT as first or even second-line treatment option. National expert consensus recommends it primarily for patients who are not candidates for surgery due to health conditions or other factors that make a surgical approach inadvisable. Of note, Superficial Radiation Therapy may not be covered by insurance.
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How Do Cure Rates Compare Between Mohs Surgery and SRT?
Published research consistently shows that Mohs surgery achieves higher long-term cure rates than SRT. At PS Dermatology and Surgery, we believe patients deserve to understand these numbers clearly. The table below summarizes published 5-year local recurrence rates from peer-reviewed studies.
|
Cancer Type |
Mohs Surgery (5-Year Recurrence) |
SRT (5-Year Recurrence) |
|
Primary Basal Cell Carcinoma |
1.0 to 2.5% |
4.2 to 15.8% |
|
Primary Squamous Cell Carcinoma |
5.8 to 10.7% |
2.6 to 3.1% |
|
Recurrent Basal Cell Carcinoma |
2.4 to 4.0% |
No published data. Not recommended to re-radiate, radiated skin. |
|
Recurrent Squamous Cell Carcinoma |
5.9% |
No published data. Not recommended to re-radiate, radiated skin. |
These figures come from multiple peer-reviewed studies with 5 to 10 year follow-up periods for Mohs surgery. By contrast, much of the published SRT literature involves shorter follow-up periods of only 1 to 3 years, and some studies showing longer follow-up have reported higher recurrence rates. It is also worth noting that several SRT studies were authored by consultants affiliated with SRT device manufacturers, which may influence reported outcomes. Your dermatologist can help you evaluate this evidence in the context of your specific diagnosis.
What Are the Side Effects and Risks of Each Treatment?
Every medical procedure carries some degree of risk, and patients should discuss potential side effects with their provider before making a treatment decision.
Mohs surgery has a well-established safety profile supported by prospective multicenter studies. As with any surgical procedure, some patients may experience minor bleeding, infection, or scarring. However, because Mohs preserves the maximum amount of healthy tissue, cosmetic outcomes are generally considered favorable, particularly in sensitive areas like the face.
SRT side effects may include:
- Skin irritation, redness, and blistering at the treatment site
- Pigmentary changes (lightening or darkening of the skin)
- Peeling and ulceration
- Hair loss in the treated area
- Potential damage to nearby structures (salivary glands, teeth) depending on treatment location
- Unpredictable long-term cosmetic results, including white, dark, or red broad scars
- Reoccurrence of skin cancer at which time, re-radiating the area is not an option and the patient is advised to pursue Mohs surgery, but now with a bigger and broader area that needs to be treated as compared to the original tumor.
Additionally, research has suggested that ionizing radiation therapy may be associated with an increased risk of secondary cancers, including basal cell carcinoma and breast cancer. Because secondary cancers can have a latency period of 10 years or more, and current SRT literature does not include follow-up beyond that timeframe, the long-term consequences of modern SRT dosing protocols remain an area that needs further study. Patients should consult their provider about how these considerations apply to their individual situation.
How Do Treatment Visits and Costs Compare?
One of the most practical differences between these two treatments is the time commitment involved. Mohs surgery is typically completed in a single office visit, with the wound often repaired the same day (sometimes a second day). SRT, by comparison, requires anywhere from 15 to 20 separate treatment sessions spread over days or weeks. For patients in Central New Jersey juggling work, family, and daily life, this difference in scheduling burden can be significant.
From a cost perspective, the multiple billing codes associated with SRT (including consultation, treatment planning, dose calculation, ultrasound guidance, and radiation delivery) can result in a substantially higher total cost compared to Mohs surgery. According to CMS public data, dermatology practices now bill for SRT-related codes more frequently than radiation oncology practices, which has raised questions within the medical community about scope of practice, training quality, as well as ethical and moral standards.
Who Is a Good Candidate for Each Treatment?
Mohs surgery is widely recommended as the first-line treatment for high-risk basal cell carcinoma and for squamous cell carcinoma of varying risk levels by both the AAD and NCCN. It is particularly well-suited for cancers on the face, ears, nose, and other cosmetically or functionally sensitive areas, as well as for aggressive or recurrent tumors.
SRT may be considered for patients who cannot undergo surgery due to medical conditions, advanced age with significant health limitations, or other factors that make local anesthesia or wound healing a concern. Your dermatologist can help determine whether surgery or an alternative approach is most appropriate for your specific case.
"As a fellowship-trained Mohs surgeon, I believe every patient deserves a clear, honest explanation of their treatment options. The published evidence strongly supports Mohs surgery as the first-line approach for most non-melanoma skin cancers, and I encourage patients to ask questions and understand the data before choosing any treatment path."
Why Training and Board Certification Matter
Mohs surgery is a required component of dermatology residency training, and the American Board of Dermatology requires fellowship training and board certification for Mohs surgeons. This ensures that every Mohs surgeon has completed rigorous, accredited education and a minimum number of supervised cases before practicing independently.
SRT training, by contrast, is not currently part of the ACGME dermatology residency curriculum. There is no fellowship program or board certification process specific to SRT delivery by dermatologists. For patients weighing their options, the level of specialized training behind each treatment is an important factor to consider. Dr. Parth Patel completed a year-long dedicated fellowship training in Mohs Micrographic Surgery at the Mount Sinai Hospital in New York City, bringing that specialized expertise to patients across Somerset, Hunterdon, and Middlesex counties.
Schedule Your Skin Cancer Consultation in Bridgewater, NJ
Choosing between Mohs surgery and SRT is a decision that should be guided by published evidence, your individual diagnosis, and a thorough conversation with a qualified specialist. At PS Dermatology and Surgery in Bridgewater, NJ, Dr. Parth Patel a fellowship-trained Mohs Surgeon, provides expertise in Mohs Surgery and works with every patient to develop a treatment plan tailored to their needs. If you or a loved one is facing a skin cancer diagnosis, we are here to help you navigate your options with clarity and confidence.
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