- 1 Background
- 2 Overview of evidence (non-systematic literature review)
- 2.1 Cryotherapy for basal cell carcinoma
- 2.2 Role of curettage
- 2.3 Electrodessication and curettage for basal cell carcinoma
- 3 Practice Point
- 4 References
Certain basal cell carcinomas (BCCs) may be successfully treated by cryosurgery.
Electrodessication and curettage (EDC) is anecdotally reported to be effective for superficial BCCs on the trunk and limbs. It is useful in the treatment of BCCs on the legs of older patients as an alternative to skin grafting. Unpredictable cosmetic results restrict its use on the face to situations where the cosmetic result is not a high priority. It has the advantages of being rapid to perform, tissue conserving, and not being contraindicated in patients taking anticoagulant medication.
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Overview of evidence (non-systematic literature review)
Cryotherapy for basal cell carcinoma
Small (<2cm) superficial BCCs are ideally treated with cryotherapy if appropriate selection criteria are applied.
Patients with pale skin types are less likely to have pigmentation disturbances after treatment with cryotherapy than those with pigmented skin.
Evidence sources (cryotherapy)
No randomised controlled studies have compared cryotherapy with surgical excision or other treatment modalities in the treatment of BCC.Many large series by specialist clinics have demonstrated cure rates with cryotherapy equivalent to those achieved with other treatment modalities.
Tumour selection (cryotherapy)
Investigators emphasise the importance of careful tumour selection to achieve acceptable results. Histological confirmation of the BCC and analysis for high-risk features is strongly recommended.
Cryosurgery is most effective for primary well-defined lesions of non-aggressive subtypes at sites other than the head and neck. Patients in whom cryotherapy can achieve equivalent outcomes to surgical excision include those with appropriately selected small (<2cm) superficial BCC and less pigmented skin types where there is a low risk of post-treatment pigmentation disturbances.
In general, cryotherapy is contraindicated for sclerosingscar-like (morphoeic) or ill-defined BCCs and relatively contraindicated for high-risk facial sites such as lips, alar creases, inner canthi and periauricular regions.
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Cure rates (cryotherapy)
Cure rates for BCC by cryosurgery are technique-dependent. Cure rates consistently exceed 95% in specialty clinics where optimal selection and treatment protocols are used. Suboptimal cryotherapy technique results in unacceptably low clearance rates. One extensive review of multiple series reported a 5-year recurrence rate for cryosurgery of 7.5%, which is comparable to that of other standard treatment modalities.Most large series utilise liquid nitrogen in an open-spray technique with repeated freeze-thaw cycles. However, superficial BCCs have been successfully treated with single freeze-thaw cycle cryotherapy, achieving cure rates of 96%. Thermocouple needle monitoring of the temperature produced at the base of tumours (–40°C to –60°C) may be employed.
Tumour features influencing outcome (cryotherapy)
Certain microscopic features are associated with a greater depth of invasion and a higher risk of recurrence (see: Pathology). Clinical features are fundamental in choosing those BCCs suitable for cryosurgery. Primary BCCs constitute the great majority of tumours treated in reported series. In general, such tumours are well-defined and non-sclerosingscar-like (morphoeic) (morphoeic) in subtype. Most series exclude ill-defined or sclerosingscar-like (morphoeic) BCCs in their selection criteria due to unacceptably high recurrence rates.
The size of a BCC also determines its response to cryosurgery. In general, the greater the diameter of a tumour, the lower the cure rate. Recurrent BCCs respond less well to cryosurgery, with lower cure rates. Mohs micrographic surgery is the preferred treatment for such lesions (see: Mohs micrographic surgery).
Less optimal results are achieved for sites on the head and neck, although acceptable cure rates have been reported for selective cancers in specialist clinics with significant cryotherapy experience.
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Role of curettage
A single-centre, randomised study that compared curettage followed by cryotherapy, with surgical excision, in the treatment of BCC reported no statistically significant difference in 5-year recurrence rates between groups.Curettage provides a sample for histology, facilitates cryotherapy of larger tumours by reducing the tissue volume to be ablated, and may offer some advantages at sites such as nose and ears to define the full extent of tumour growth prior to cryosurgery.
Routine follow-up is essential for all patients treated by cryosurgery.Most recurrences will become evident within 5 years and many within 2 years. However, some BCCs have recurred as late as 10–12 years after treatment.
Training and supervision (curettage)
Cryosurgery should be performed only by operators with appropriate supervised training in the procedures.
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Electrodessication and curettage for basal cell carcinoma
Small (<2cm) nodular and superficial BCCs are suited to treatment with EDC.
Following EDC, healing with acceptable scarring is more likely for BCC in concave areas, compared with convex areas, and for older (>70 years) patients than younger patients.
Evidence sources (EDC)
No randomised controlled studies have compared EDC with surgical excision or other treatment modalities in the treatment of BCC.Observational studies such as case series have reported outcomes of EDC in the treatment of BCC.
Cure rates (EDC)
Cryotherapy achieves high cure rates for primary basal cell carcinoma in sites other than face and ears if tumour selection and treatment protocols are optimal. Cure rates of approximately 95% or higher have been reported for tumours smaller than 1cm in some sites (Table 9).
Tumour selection (EDC)
Lesion selection by site and size is critical (Table 9).
Sclerosingscar-like (morphoeic) (morphoeic) BCCs are not treated with EDC, as they are not curettable due to the lack of a gelatinous stroma. Excisional data does confirm that histological type is a significant factor in recurrence; sclerosingscar-like (morphoeic) and other infiltrating types of BCC characterised histologically by small cell clumps show higher recurrence rates.
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Basal cell carcinomas in concave areas heal with reduced scarring post EDC compared with those in convex areas.
Older (>70 years) patients often have better scar outcomes post EDC, compared with younger patients.
Table 9 Control rates for basal cell carcinomas treated by serial curettage by diameter
|Lesion: size/location||Cure rate at 5 years|
|<1cm all sites||98.77%|
|>2cm all sites||84%|
|All sizes excluding head||> 96%|
|<1cm cheek, forehead and temple||94.7%|
|>1cm as above ||77.3%|
|<0.5cm nasal, paranasal, periorbital, lips, chin, jawline and ears||94.7%|
|>0.5cm as above||77.3%|
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Electrodessication and curettage is not appropriate for:
- lesions in high-risk areas (nasal, paranasal, lips, eyelids, chin, jawline and ears), or at least not for lesions larger than 5mm at these sites
- lesions larger than 10mm on middle-risk sites (face, forehead, temples and scalp)
- clinically sclerosingscar-like (morphoeic) lesions
- recurrent lesions.
Training and supervision (EDC)
Long-term follow-up is essential after treatment of BCC with EDC, as late recurrences may occur.
PP 9.1.1. Long-term follow-up is essential after treatment of basal cell carcinoma with cryotherapy, as late recurrences may occur.
Notes on the recommendations
Follow-up of patients after treatment is individually tailored according to patient factors, tumour factors, anatomic site and the perceived adequacy of treatment.
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