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Perivascular epithelioid cell tumors (PEComas) are rare mesenchymal neoplasms with unpredictable behavior. They are characterized by epithelioid cells, which stain with melanocytic markers, associated with spindle cells reactive for smooth muscle markers. PEComas may be sporadic or associated with the tuberous sclerosis complex, with mutations affecting mostly tuberous sclerosis complex (TSC) 2 and less frequently TSC1 genes. More recently a subtype of PEComa harboring TFE3 gene rearrangement, mutually exclusive with TSC complex mutations, has been identified. The bladder and the other genitourinary tract organs are an infrequent site of origin; to date, only 3 cases of primitive bladder PEComas, 1 prostatic PEComa, and 2 epithelioid angiomyolipomas of the kidney with TFE3 rearrangement have been described in literature. We report a bladder PEComa case with Xp11 rearrangement in a patient who previously had undergone chemotherapy for chronic lymphatic leukemia. We assessed the meaning of the presence of TFE3 rearrangement in genitourinary tract PEComas and the possible correlation of these uncommon lesions with previous chemotherapy. A better understanding of this entity's genetics may help suggest appropriate targeted therapy, which is still lacking in genitourinary tract PEComas.

Macrophages (MΦs) and reactive oxygen species (ROS) are implicated in carcinogenesis. The oxidative stress sensor, transient receptor potential ankyrin 1 (TRPA1), activated by ROS, appears to contribute to lung and breast cancer progression. Although TRPA1 expression has been reported in melanoma cell lines, and oxidative stress has been associated with melanocytic transformation, their role in melanoma remains poorly known. Here, we localized MΦs, the final end-product of oxidative stress, 4-hydroxynonenal (4-HNE), and TRPA1 in tissue samples of human common dermal melanocytic nevi, dysplastic nevi, and thin (pT1) and thick (pT4) cutaneous melanomas. The number (amount) of intratumoral and peritumoral M2 MΦs and 4-HNE staining progressively increased with tumor severity, while TRPA1 expression was similar in all samples. Hydrogen peroxide (H2O2) evoked a TRPA1-dependent calcium response in two distinct melanoma cell lines (SK-MEL-28 and WM266-4). Furthermore, H2O2 induced a TRPA1-dependent H2O2 release that was prevented by the TRPA1 antagonist, A967079, or Trpa1 gene silencing (siRNA). ROS release from infiltrating M2 MΦs may target TRPA1-expressing melanoma cells to amplify the oxidative stress signal that affects tumor cell survival and proliferation.

Epidermoid cysts of the gastrointestinal tract are very uncommon and the published literature on this subject is anecdotal. We report the case of a 51-year-old man who was diagnosed with a cystic neoplasm located close to the cecum and the appendix. Given the strong suspicion of an appendiceal mucocele, the patient underwent a laparoscopic exploration. During the operation, a semisolid mass appearing to originate from the cecal wall was identified and a laparoscopic ileo-cecal resection was performed. The pathological diagnosis was an epidermoid cyst of the cecum. An epidermoid cyst of the cecum is a rare entity that usually has a mild and aspecific clinical picture. However, it should be included in the differential diagnosis of an occasionally diagnosed peri-cecal cystic lesion.

A 67-year-old man presented to ear, nose and throat department complaining of nasal congestion and recurrent epistaxis for 5 months. Nasal endoscopy revealed a pigmented polyp obstructing the right nasal cavity. MRI with contrast agent showed a right nasal cavity polypoid mass with hyper signal intensity (SI) both in non-enhanced T1-w and diffusion imaging, marked hypo SI in T2-w sequences and avidly contrast enhancement characterised by rapid wash-in without significant wash-out on dynamic perfusion imaging. Histological specimen showed epithelioid and spindle cells with focal intense pigmentations and immunohistochemical features compatible with primary melanotic sinonasal mucosal melanoma (SNM). As melanotic SNM shows MRI pathognomonic high non-enhanced T1-w SI, this case underlines the crucial role of MRI not only in assessing the local tumour extension/recurrence but also in increasing the diagnostic confidence of detecting melanotic SNM. Thus, MRI should be always performed in case of clinical–endoscopic suspicion of SNM.

e23518 Background: In patients with GIST, literature reports a risk of second primary tumors between 4.5% and 33% with different distribution in the worldwide. The network of 7 italian EURACAN centers has collected clinical and molecular features of GIST patients with second primary tumors. Methods: We reviewed the clinical characteristics of 201 patients with GIST and second primary tumors in order to evaluate association between risk of dead and each possible factor, using Kaplan meier curve, log-rank test and Cox model for Hazard Ratio and it’s interval Confidence 95% estimation. Furthermore, NGS analysis ( 56 gene onco panel) in 72 patients with GIST was performed. Results: On the basis of the significant correlation previously observed between the Miettinen risk criteria of GIST (low/very low) and the incidence of second primary tumors (gastrointestinal tumors),P < 0.001 (Abstr 11032 ASCO 2019), we observed in these patients a median age of diagnosis of GIST of 68, with prevalent gastric site localization ( KIT exon 11 mutation), NF1 and Lynch (kit/pdgfra WT) syndromes in the low risk subgroup. The more frequent site of second epithelial tumor in gastrointestinal tract was the colon followed by gastric, pancreatic and biliary tract. In patients with GIST with low-very low risk according Miettinen classification, after a median follow-up period of 25 years, we have observed that the gastroenteric site of second tumors occurrence is significantly related to the survival (p < .0003). In the NGS analysis of the GIST we observed the pathogenetic somatic mutations in the following genes: BRCA 2 (p.Thr2125fs), but germline test negative, TP53 (p.Arg192*,p.Gly244Ser,p.His168Leu), RET (p.Lys120Asn, p.His168Leu, p.Thr930Met ), NRAS (p.Gly134Asp), CTNNB1 (p.Ser45Phe), MSH6 (P.Ala164Val), SMARCB1 (p.Arg192), VHL (p.Gly93Val), PTEN(p.Val158Ile, p.Asn323fs), STK1I (p.Arg40Cys), SMO (p.Glu194Lys), EGFR (p.Gly721Asp), ATM (p.Asp2708Asn), ERBB4 (p.Asn181Ile). Conclusions: In our analysis patients with GIST (low-very low classes according to Miettinen) have significant risk to death because of second primary tumors in gastrointestinal tract. Specific attention to gastrointestinal screening during the follow-up of GIST (low and very low risk) is required.

An 85-year-old woman presented with a lesion on the sole of her right foot, which was histologically confirmed as acral lentiginous melanoma. Because of the large field involved and because the patient refused any invasive or painful treatment, topical treatment with imiquimod was commenced. At the 20-month follow-up, the patient was still continuing treatment with topical imiquimod, and no metastases to the lymph nodes or viscera were found, either clinically or in imaging studies. We believe that the success of the treatment cannot be explained only by the stimulation of the immune system induced by imiquimod. A possible explanation might be 'tumour dormancy', where a tumour grows very slowly because of a balance between the neoplasia and the immune (and nonimmune) mechanisms of tumour control. The use of imiquimod has so far allowed our patient to avoid surgery, and perturbation of the mechanisms of tumour regulation, such as local immunity and angiogenesis, has not taken place.

Background. Scalp/neck melanomas have a poor progno- sis, possibly because of a rich vascular supply that prompts tumor cells' dissemination. Methods. We compared the accuracy of immunohistochemical (IHC) staining with morphology for the identification of lymphovascular inva- sion in 156 scalp/neck melanomas. We then analyzed the association of vessel invasion and density with pathological features and survival. Results. IHC-detected lymphatic vessel invasion (LVI) and blood vessel invasion (BVI) were identified in 34.6% and 13.5% of cases, respectively. IHC increased the LVI/BVI detection compared to morphology (40.4% vs 16.6%; p

we read with interest the manuscript published by Gonzales et al,1 highlighting lichenoid reactions as an emerging side effect of biologics, with special regard to infliximab-biosimilar. We recently observed a 50-year-old male patient with a long-standing history of moderate-to-severe psoriasis, who developed oral lichen planus (LP) triggered by infliximab biosimilar CT-P13. Interestingly the same patient experienced cutaneous and oral LP when treated with IL-17A blocker, secukinumab. The patient suffered for hypertension, in treatment with valsartan, and anxiety. He previously failed to respond to phototherapy, methotrexate, etanercept and adalimumab. This article is protected by copyright. All rights reserved.