tretinoin and Keratoacanthoma

Topics: Adjuvants, Immunologic; Animals; Breast Neoplasms; Carcinogens; Cricetinae; Diterpenes; Female; Humans; Keratoacanthoma; Lung Neoplasms; Male; Mice; Neoplasms; Prostatic Neoplasms; Rats; Retinoids; Retinyl Esters; Tretinoin; Vitamin A

Topical vitamin A acid (VAA) has various mechanisms of action which may be responsible for its therapeutic success in many different disorders. Although the absorption, metabolism, and excretion of VAA are not completely understood, VAA appears to remain mainly on the skin surface. The question of carcinogenicity is unresolved, and more research is needed to clarify this problem. This article reviews the literature regarding the therapeutic uses of VAA and summarizes various investigators' experiences with VAA.

Topics: Acne Vulgaris; Animals; Callosities; Cocarcinogenesis; Fox-Fordyce Disease; Humans; Ichthyosis; Keloid; Keratoacanthoma; Keratosis; Lichen Planus; Melanoma; Melanosis; Molluscum Contagiosum; Nevus; Psoriasis; Skin Absorption; Skin Diseases; Skin Neoplasms; Tretinoin

Topics: Acitretin; Administration, Cutaneous; Administration, Oral; Biopsy; DNA, Viral; Drug Therapy, Combination; Human papillomavirus 16; Humans; Keratoacanthoma; Keratolytic Agents; Male; Middle Aged; Papillomavirus Infections; Skin; Treatment Outcome; Tretinoin

Topics: Aged; Alitretinoin; Antineoplastic Agents; Female; Forearm; Humans; Indoles; Keratoacanthoma; Melanoma; Proto-Oncogene Proteins B-raf; Retinoids; Skin Neoplasms; Sulfonamides; Tretinoin; Vemurafenib

A fundamental goal in cancer biology is to identify the cells and signalling pathways that are keys to induce tumour regression. Here we use a spontaneously self-regressing tumour, cutaneous keratoacanthoma (KAs), to identify physiological mechanisms that drive tumour regression. By using a mouse model system that recapitulates the behaviour of human KAs, we show that self-regressing tumours shift their balance to a differentiation programme during regression. Furthermore, we demonstrate that developmental programs utilized for skin hair follicle regeneration, such as Wnt, are hijacked to sustain tumour growth and that the retinoic acid (RA) signalling pathway promotes tumour regression by inhibiting Wnt signalling. Finally, we find that RA signalling can induce regression of malignant tumours that do not normally spontaneously regress, such as squamous cell carcinomas. These findings provide new insights into the physiological mechanisms of tumour regression and suggest therapeutic strategies to induce tumour regression.

Topics: Animals; Carcinoma, Squamous Cell; Disease Models, Animal; Hair Follicle; Keratoacanthoma; Mice; Remission, Spontaneous; Skin Neoplasms; Stem Cells; Tretinoin; Wnt Signaling Pathway

Retinoic acid (RA) and its analogues (retinoids) are promising agents in skin cancer prevention following either topical application or oral administration. However, long-term in vivo effects of RA on chemically induced hyperplastic epidermal foci in adult mouse skin have also been described, casting some doubt with regard to its chemopreventive activity.. To characterize chemically induced skin tumours and to investigate the in vivo long-term action and preventive effect of RA on adult mouse skin carcinogenesis.. Fifty-six adult Naval Medical Research Institute mice, exposed (n = 28) or not exposed (n = 28) to RA in utero.. Mice were treated with a standard two-stage skin carcinogenesis protocol, which included an initiating application of 7,12-dimethylbenz(a)anthracene followed by promotion with 12-O-tetradecanoylphorbol 13-acetate.. Retinoic acid administered to pregnant mice showed a long-term inhibitory action on cell differentiation and development of chemically induced tumours on the adult skin of their offspring, as well as a stimulatory effect on cell proliferation and expression of an early marker of malignant progression (keratin 13).. The results suggest that RA exposure in utero confers long-lasting effects on adult mouse skin carcinogenesis. These include chemopreventive activity (reduced number of tumours), as well as enhancement of squamous papilloma progression, which appears to be due to enhanced keratinocyte proliferation and suppression of epidermal maturation. The clinical significance of these findings is not known for other routes of RA administration at this time.

Topics: 9,10-Dimethyl-1,2-benzanthracene; Animals; Antineoplastic Agents; Carcinogens; Carcinoma, Squamous Cell; Drug Administration Schedule; Female; Keratoacanthoma; Male; Mice; Papilloma; Pregnancy; Skin Neoplasms; Tetradecanoylphorbol Acetate; Treatment Outcome; Tretinoin

Keratoacanthoma centrifugum marginatum (KCM) is a rare variant of keratoacanthoma characterized by a progressive peripheral growth with concomitant central healing. We report here a case of multiple KCM of the lower legs in a 48-year-old man. The lesions had progressively evolved over 3 years. They were multiple asymptomatic and confluent annular plaques of 5 to 20 cm, having papulo-nodular with hyperkeratotic and crusted borders and cicatricial center. Within the centers were numerous firm and pigmented minipapules of 1 to 2 mm. The typical clinical aspect, together with characteristic histological features confirmed the diagnosis of KCM. Herein we will highlight the clinical and histological features of KCM, as well as the different effective treatments. We will also briefly discuss KCM among the other types of keratoacanthomas.

Topics: Administration, Cutaneous; Humans; Keratoacanthoma; Leg Dermatoses; Male; Middle Aged; Tretinoin

Multiple eruptive keratoacanthoma of Witten and Zak is a rare disorder characterized by numerous small, eruptive tumors and larger, more typical keratoacanthomas. Affected patients have features of Grzybowski-type keratoacanthomas and Ferguson Smith type. Two patients with multiple keratoacanthomas were treated with oral retinoids. Both patients had hundreds of follicular papules on the trunk and extremities. Less common lesions included nodules with central horn-filled craters more characteristic of classic keratoacanthomas. Retinoid therapy resulted in regression of the larger, more typical keratoacanthomas in both patients. The small follicular keratoacanthomas remained unaffected. Thus oral retinoids are only partially beneficial for the treatment of the Grzybowski type or the Witten and Zak type of multiple eruptive keratoacanthomas.

Topics: Administration, Oral; Aged; Etretinate; Female; Humans; Keratoacanthoma; Male; Skin Diseases; Tretinoin

Topics: Fluorouracil; Humans; Isotretinoin; Keratoacanthoma; Podophyllin; Tretinoin

A patient with multiple keratoacanthomas was successfully treated with oral isotretinoin. The treatment resulted in clearing of existing keratoacanthomas and prevented the development of new lesions. An induction dose of 1.5 mg/kg/day was necessary to initiate the response. This is the third report of successful treatment of multiple keratoacanthomas with isotretinoin.

Topics: Administration, Oral; Adult; Humans; Isotretinoin; Keratoacanthoma; Male; Skin; Skin Diseases; Tretinoin

Two representative cases of familial Muir-Torre syndrome are presented. Multiple benign sebaceous neoplasms in both cases and a solitary keratoacanthoma in one were successfully treated with oral isotretinoin. Low-dose maintenance therapy has stabilized the cutaneous manifestations in the two patients, and no new epithelial neoplasms have appeared. This report emphasizes (1) the rationale for the use of isotretinoin in the Muir-Torre syndrome and (2) the potential for a familial pattern of inheritance and a possible association with the cancer family syndrome. It speculates on the prevention of future internal malignancies in Muir-Torre syndrome patients by maintenance oral isotretinoin treatment.

Topics: Administration, Oral; Female; Humans; Isotretinoin; Keratoacanthoma; Middle Aged; Neoplasms, Multiple Primary; Sebaceous Gland Neoplasms; Syndrome; Tretinoin

An 83-year-old woman with multiple squamous cell carcinomas and keratoacanthomas of the legs was treated with orally administered isotretinoin (13 cis-retinoic acid). Complete regression of the tumors was noted during the initial six-month treatment period. In the subsequent 36 months, four new cutaneous tumors were excised. There have been no recurrences of lesions that regressed while the patient was receiving retinoid therapy.

Topics: Administration, Oral; Aged; Carcinoma, Squamous Cell; Female; Humans; Isotretinoin; Keratoacanthoma; Leg; Skin Diseases; Skin Neoplasms; Tretinoin

Both auricles of 21 domestic rabbits were painted with dimethylbenzanthracene (DMBA). Eleven animals of this group were additionally fed aromatic retinoid (AR) by an esophageal tube. Two control animals were not treated at all. Eight or 9 weeks after the beginning of the study six of the seven remaining animals, which had only been painted with DMBA, developed a total of 25 keratoacanthoma-like tumors (KA). On the other hand, none of the seven animals left, which were painted with DMBA and fed AR showed any tumor by this time. The systemic effect of AR was studied in biopsies from the snout and the back. The epidermis of the snout showed 'mucous mataplasia' by histochemical and electron-microscopic criteria, whereas the epidermis of the back was not significantly altered. The production of intra- and extracellular lamellated material indicated an additional effect of AR on epidermal lipid metabolism. The effect of AR in the prevention of DMBA-induced tumors was characterized by 'mucoid cytolysis' and karyolysis.

Topics: 9,10-Dimethyl-1,2-benzanthracene; Animals; Benz(a)Anthracenes; Esophagus; Etretinate; Intubation; Keratoacanthoma; Microscopy, Electron; Neoplasms, Experimental; Rabbits; Skin; Skin Diseases; Skin Neoplasms; Tretinoin

Topics: Administration, Oral; Adult; Foot Dermatoses; Foot Diseases; Humans; Isotretinoin; Keratoacanthoma; Male; Neoplasms, Multiple Primary; Skin Neoplasms; Tretinoin

In normal rabbit epidermis or in the untreated skin tumor, keratoacanthoma the usual cell junction is the desmosome. Gap junctions are very sparse. The extracellular tracer material, lanthanum nitrate was used to confirm the definite identification and increase of gap junctions in the vitamin A acid-treated keratoacanthoma. Without the use of lanthanum, the gap may not be always apparent in conventional thin sections and can be confused with the zonula occludens.

Topics: 9,10-Dimethyl-1,2-benzanthracene; Animals; Epithelium; Intercellular Junctions; Keratoacanthoma; Lanthanum; Male; Rabbits; Skin; Tretinoin; Vitamin A