Confocal microscopy: innovative diagnostic tools for monitoring of noninvasive therapy in cutaneous malignancies

Mediators of Inflammation in Topical Therapy of Skin Cancers

Taking into consideration that the immune system plays a very important role in the development of melanoma and non-melanoma skin cancers, which have a high prevalence in immunosuppressed patients and after prolonged ultraviolet radiation, the interest in developing novel therapies, in particular targeting the inflammation in cancer, has increased in the past years. The latest data suggest that therapies such as imiquimod (IMQ), ingenol mebutate (IM), 5-fluorouracil (5-FU), retinoids, and nonsteroidal anti-inflammatory drugs (NSAIDs) have been used with success in the topical treatment of some cancers. Herein, we review the topical treatment targeting the inflammation in skin cancer and the mechanisms involved in these processes. Currently, various associations have shown a superior success rate than monotherapy, such as systemic acitretin and topical IMQ, topical 5-FU with tretinoin cream, or IMQ with checkpoint inhibitor cytotoxic T lymphocyte antigen 4. Novel therapies targeting Toll-like receptor-7 (TLR-7) with higher selectivity than IMQ are also of great interest.

Effectiveness and limitations of reflectance confocal microscopy in detecting persistence of basal cell carcinomas: a preliminary study

BACKGROUND/OBJECTIVES

Reflectance confocal microscopy (RCM) can accurately and non-invasively diagnose basal cell carcinoma (BCC). The use of RCM in assessing responses to saucerization or curettage and cautery of BCC has not been established. The aim of the present study was to expound the usefulness of RCM in assessing treatment responses of BCC to saucerization or curettage and cautery 8-12 weeks after treatment.

METHODS

Eight sequential patients, with 11 superficial BCCs, were recruited. Lesions were evaluated clinically and dermoscopically. Three operators performed RCM imaging for each BCC at baseline and 8-12 weeks after treatment. Diagnostic criteria for RCM diagnosis included streaming of basal cells and the presence of cord-like structures and horizontal vessels. Results were compared against histopathology. Difficulties in establishing tumour clearance were identified and the effectiveness of RCM in assessing the response to treatment was explored.

RESULTS

At baseline, all lesions were consistent with superficial BCC. At 8-12 weeks after treatment, RCM correctly diagnosed 10 of 11 lesions as tumour free. Furthermore, RCM was reliable across operators of variable experience and the findings were confirmed histopathologically. Limitations were identified, but appeared to be related to operator experience.

CONCLUSION

The diagnosis of BCC was straightforward and reliable in the present study. Thus, RCM appears useful in assessing the early treatment response of superficial BCC treated with saucerization or curettage and cautery despite operator-dependent limitations.