Mohs Vs Electrodessication & Curretage for Recurrent Bcc?

A study published by Rowe and coleagues in the late 1980's examined this very issue. Their study showed that treatment of a recurrent basal cell carcinoma with EDC has about a 40% chance of recurring. Using Mohs surgery to treat a recurrent basal cell carcinoma has about a 6% chance of recurring. Mohs surgery is thought to minimize scarring after surgery and provide optimal cosmetic results. I typically recommend Mohs surgery for recurrent tumors.

Both approaches are reasonable and the choice will ultimately be yours to make.The cure rate with retreatment with the original modality often drops to 50% or less. ( It may be slightly higher cure with superficial lesions.)  Mohs offers 95% or better cure rates even with recurrent lesions.  If you have access to a qualified Mohs surgeon I would strongly encourage you to take this path. 

It is possible that both would work; however, Mohs would work more often. As quoted by Doctor Mamelak, Dan Rowe and colleagues published a number of articles in the late 1980's that looked at the recurrence rate of Mohs, surgical excision, electrodesiccation and curettage and radiation therapy. I believe there were 3 articles, one on primary (not-previously-treated) basal cell carcinoma, another on recurrent basal cell carcinoma and a third on squamous cell carcinoma. The articles were a retrospective study of previous articles describing the treatment success of various modalities for these cancers.

The chance of recurrence following electrodesiccation and curettage of a recurrent basal cell carcinoma was about 40% (i.e. 60% cure rate). The chance of recurrence following Mohs surgery for a recurrent basal cell carcinoma was about 6% (i.e. 94% cure rate). Recurrent tumors may be more difficult to clear because the tumor cells could be shielded by scar tissue (reason why radiation therapy not as good for recurrent cancers) or the tumor cells could be deeper or separated by normal tissue. In the temple area a branch of the facial nerve called the temporal branch becomes very superficial in the temple. Depending on the location of your skin cancer, if the tumor continues to recur the chance of involvement or injury to this branch of the facial nerve increases.

In regards to your comment that "...Mohs result(s) in a larger surgical scar..." all I can say is that if a defect is larger than you expect after properly-performed Mohs surgery then the cancer must have been larger than expected. Mohs surgery starts with a 1-2 mm margin which is smaller than the margin recommended for standard surgical excision for basal cell or squamous cell carcinoma. If you choose Mohs surgery, I would recommend that you see a dermatologist who has completed a Mohs surgery fellowship and is a member or fellow of the American College of Mohs Surgery.

Your best option is to discuss your situation with your dermatologist and/or your Mohs surgeon and talk about your particular case. Based on your physical examination, your subtype of basal cell carcinoma, and your concerns, you and your doctor should be able to determine the best treatment for your recurrent skin cancer. Good luck.