OBJETIVOS: Avaliar características clínico-patológicas com ênfase na presença de variantes histológicas (VH) nos carcinomas uroteliais da bexiga e nas metástases linfonodais (ML). Caracterizar perfis imuno-histoquímicos relacionados aos subtipos moleculares e verificar suas associações clínico-patológicas. MÉTODOS: 183 carcinomas uroteliais de alto grau músculo-invasivos submetidos a cistectomia radical no Instituto do Câncer do Estado de São Paulo, HCFMUSP ou Hospital Alemão Oswaldo Cruz foram caracterizados quanto ao gênero, idade, tamanho, focalidade, configuração neoplásica, necrose, invasões angiolinfática e perineural, VH, carcinoma in situ, infiltrado inflamatório peri e intratumoral, estádio, margem cirúrgica, ML e VH na metástase. Resultados semi-quantitativos da pesquisa imuno-histoquímica (IH) de CK20 e GATA3 (associados ao subtipo luminal) e CK5, SALL4 e Vimentina (associados ao subtipo basal), que foi realizada em micromatrizes teciduais com abundante representação do tumor primário e das ML, tiveram valor de corte de 20%, definindo os casos em positivos e negativos. Casos negativos para CK20 ou GATA3 e positivos para CK5 foram agrupados no subtipo basal; casos positivos para CK20 ou GATA3 e negativos para CK5 agrupados no subtipo luminal e casos duplo positivos ou duplo negativos agrupados no subtipo indeterminado. As associações entre estes subtipos e as características clínico-patológicas foram realizadas através de testes qui-quadrado ou exato de Fisher para as variáveis categóricas. A comparação dos subtipos obtidos no centro do tumor e na ML foi realizada com testes de McNemar-Bowker e concordância pelo coeficiente Kappa. A análise de sobrevida foi realizada pelo método Kaplan-Meier e testes de Breslow. RESULTADOS: VH foram observadas em 116 (63,4%) casos e associadas a invasão linfovascular (p=0,043), VH na metástase (p < 0,001), pior sobrevida global (p=0,043). Havia 14 diferentes VH, a escamosa, mais comum, foi associada a tumores maiores (p=0,003); necrose (p=0,004); VH sarcomatoide (p=0,047), VH na metástase (p=0,003), sem impacto nas sobrevidas. VH micropapilífera, segunda mais observada, foi associada a invasão linfovascular (p=0,002); margem cirúrgica positiva (p=0,005); metástase linfonodal (p < 0,001), VH na metástase (p=0,007) e piores sobrevidas doença específica (p=0,016) e global (p=0,005). VHs foram observadas em 40,7% das metástases linfonodais, com apenas um caso discordante das VH observadas no tumor vesical. Nos dois perfis IH estabelecidos não houve impacto nas sobrevidas e o subtipo basal foi associado a tumores maiores (CK5/CK20 p=0,025; CK5/GATA3 p=0,006) e a variante escamosa (CK5/CK20 e CK5/GATA3 p < 0,001) e o subtipo luminal foi associado a variantes micropapilífera (CK5/CK20 e CK5/GATA3 p < 0,001) e plasmocitoide (CK5/CK20 p=0,003; CK5/GATA3 p=0,011). Foi moderado o grau de concordância do subtipo observado no centro comparado ao observado na ML (CK5/CK20 Kappa=0,57; CK5/GATA3 Kappa=0,48). CONCLUSÕES: A presença de VH nos carcinomas uroteliais da bexiga, além de acarretar heterogeneidade intratumoral, foi associada a características clínico-patológicas de agressividade, com impacto na sobrevida, sobretudo na variante micropapilífera. O perfil IH basal foi associado a tumores maiores com variante escamosa e o perfil IH luminal foi associado às variantes micropapilífera e plasmocitoide. Os perfis IHs não diferiram quanto às sobrevidas e houve moderada concordância com os perfis observados nas ML / OBJETIVES: Evaluate clinicopathological features emphasizing the presence of histological variants (HV) in bladder urothelial carcinomas and their lymph node metastasis (LNM). Characterize immunohistochemical profiles related to molecular subtypes and verify their clinicopathological associations. METHODS: 183 high-grade muscle-invasive urothelial carcinomas undergoing radical cystectomy at Instituto do Câncer do Estado de São Paulo, HCFMUSP or Hospital Alemão Oswaldo Cruz were classified according to gender, age, size, focality, neoplastic configuration, necrosis, lymphovascular and perineural invasion, HV, carcinoma in situ, peritumoral and intratumoral inflammatory infiltrate, stage, surgical margin, LNM and HV in metastasis. Semi-quantitative results of the immuhistochemical (IHC) studies for CK20 and GATA3 (associated with the luminal subtype) and CK5, SALL4 and Vimentin (associated with basal subtype), which were performed in tissue microarrays with abundant representation of the primary tumor and LNM, had a cutoff value of 20%, dividing cases into positive and negative. Negative cases for CK20 or GATA3 and positive for CK5 were grouped into the basal subtype; positive cases for CK20 or GATA3 and negative for CK5 were grouped into luminal subtype and double positive or double negative cases were grouped into the undetermined subtype. The associations between these subtypes and clinicopathological features were performed using chi-square or Fisher´s exact tests for the categorical variables. Comparison of the subtype obtained at the center of the tumor and LNM was performed using McNemar-Bowker test and agreement with Kappa coefficient. Survival analysis was performed using Kaplan-Meier method and Breslow tests. RESULTS: HV were observed in 116 (63.4%) cases and associated with lymphovascular invasion (p=0.043); HV in metastasis (p < 0.001), worse overall survival (p=0.043). There were 14 different HV, and squamous variant, the most common, was associated with larger tumors (p=0.003); necrosis (p=0.004), sarcomatoid variant (p=0,047), HV in metastasis (p=0.003), with no impact on survival. Micropapillary variant, the second most observed, was associated with lymphovascular invasion (p=0.002); positive surgical margin (p=0.005); LNM (p < 0.001); HV in metastasis (p=0.007) and worse disease-specific (p=0.016) an overall survival (p=0.005). HV were observed in 40.7% of the LNM, and only one case was discordant with HV observed in the bladder tumor. In both IHC profiles there was no impact on survival, and the basal subtype was associated with larger tumors (CK5/CK20 p=0.025; CK5/GATA3 p=0.006) and squamous variant (CK5/CK20 and CK5/GATA3 p < 0.001). Luminal subtype was associated with micropapillary variant (CK5/CK20 and CK5/GATA3 p < 0.001) and plasmacytoid variant (CK5/CK20 p=0.003; CK5/GATA3 p=0.011). There was moderate agreement between the subtype observed in the tumor center compared to that observed in LNM (CK5/CK20 Kappa=0.57; CK5/GATA3 Kappa=0.48). CONCLUSIONS: The presence of HV in bladder urothelial carcinomas, in addition to cause intratumoral heterogeneity, was associated with clinical and pathological characteristics of aggressiveness, with impact on survival, especially in the micropapillary variant. The basal IHC profile was associated with larger tumors and squamous variant, and the luminal IHC profile was associated with micropapillary and plasmacytoid variants. The IHC profiles did not differ on the survival rates and there was moderate agreement compared to the subtypes observed in LNM