Recurrence of Basal Cell Carcinoma Uncommon After Mohs Surgery
Randall K. Roenigk, MD, Mayo Clinic
DEAR MAYO CLINIC:
I've had Mohs surgery three times in the past 18 months to remove a basal cell carcinoma on my nose. Is there some other treatment that I should be pursuing? Is it common to have so many recurrences in such a short amount of time?
Our noses are the No. 1 spot for skin cancer. So it's not surprising that basal cell carcinoma appeared on your nose.
Basal cell carcinoma is the most common skin cancer, the most easily treated and the least likely to spread. Previously thought to be a condition that affected mostly the elderly, it's increasingly common in patients in their 20s and 30s.
Getting more than one basal cell carcinoma is common. Patients with a previous diagnosis of skin cancer are 40 percent more likely to be diagnosed with new skin cancer, compared to those who have never had skin cancer. However, three times in 18 months in one location is unusual. A basal cell carcinoma recurrence after Mohs surgery is uncommon.
Mohs surgery, a very precise surgical technique, is the preferred treatment for basal cell carcinoma, especially when it occurs on the face. The tumor is excised layer by layer, with the surgeon taking time during the procedure to look at the excised cells under a microscope. Usually only one or two layers need to be removed for each Mohs procedure. For more complex tumors, many more stages of excision may be needed. The check-and-continue process allows the surgeon to remove all of the tumor while sparing surrounding healthy tissue. Typically the surgery takes about four hours.
Mohs is very effective when done by a physician trained in this approach. The five-year cure rate is 99 percent. Given the success rate of these procedures, your situation is very rare, but possible explanations include:
Compromised immune system: Basal cell carcinoma is more likely to recur in immunosuppressed patients, such as those with AIDS or patients who have undergone organ transplants. If this is your situation, the recurrence is less surprising.
Family history: Occurrence and recurrence of basal cell carcinoma is more likely when a family member also has had this cancer.
An overlooked tumor: It's possible that the second and third cancers weren't obvious at the time of the previous surgeries. Basal cell carcinoma has several different looks. It can appear as a translucent nodule; a scaly, red patch similar to psoriasis or eczema; or less often, as a white, waxy scar.
A different skin cancer: Other skin cancers, such as melanoma, are more likely to skip cell layers and spread. A biopsy would confirm the specific cancer type.
Missed cancer cells: It could be that the surgeon didn't get all the cancer cells during the Mohs procedure, and the tumor kept growing.
Other treatment options for basal cell carcinoma include creams, radiation and laser therapy. While these options may be appropriate in some situations, they usually aren't as effective as Mohs surgery.
For peace of mind, I'd suggest that you consult with another dermatologist trained in the Mohs procedure, which, by the way, was named after
Ask the doctor about his/her specific training and experience in the Mohs procedure. Learning this approach requires a yearlong
fellowship in procedural dermatology that is accredited by the ACGME (
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