Front pattern of invasion in squamous cell carcinoma of the penis: new prognostic factor for predicting risk of lymph node metastases.
OBJECTIVE
Treatment of penile carcinoma is based on excision of the primary tumor and regional lymphadenectomies. Lymph node metastasis is the most important prognostic factor, yet it cannot be reliably evaluated by imaging studies or clinical examinations; thus, new prognostic factors such as the pattern of invasion must be investigated.


METHODS
The data of 112 patients with penile carcinoma who underwent amputation and lymphadenectomy were analyzed. The clinicopathologic variables were studied, in addition to the front pattern of invasion according to the standards established by the modified criteria of Anneroth and Bryne first used as a part of a prognostic score in squamous cell carcinoma of the oral cavity. The pattern of invasion expresses the tumor-host tissue relationship, demonstrating the infiltrative tumor characteristics. This pattern was defined as infiltrating (invasion in blocks of small solid strands of cell tumors that broadly infiltrated the organ's stroma) and pushing infiltration (tumor cells have invaded large cell blocks with well-defined tumor-host interfaces).


RESULTS
The variables that were significantly associated with the presence of lymph node metastases on univariate analysis were clinical N stage (P = 0.011), lymphatic permeation (P <0.001), venous embolization (P = 0.025), and the pattern of invasion (P <0.001). In the multivariate model, the lymphatic permeation, clinical N stage, and invasion type were independent risk factors for lymph node metastases. The follow-up varied from 0.1 to 452.8 months (mean 76.9, median 27.3).


CONCLUSIONS
Lymphatic permeation, clinical N stage, and standard infiltrating invasion were independent prognostic variables for the risk of lymph node metastasis.
Guimarães
Gustavo Cardoso
GC
Department of Pelvic Surgery, Division of Urology, Centro de Tratamento e Pesquisa Hospital do Câncer A. C. Camargo, São Paulo, São Paulo, Brazil. guimaraesgc@uol.com.br
Lopes
Ademar
A
Campos
Rodrigo Sousa Madeira
RS
Zequi
Stenio de Cássio
Sde C
Leal
Marcos Lima de Oliveira
ML
Carvalho
André Lopes
AL
da Cunha
Isabela Werneck
IW
Soares
Fernando Augusto
FA
D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000473:pathology* / Q000556:secondary* / Q000601:surgery; D006801:Humans; D008197:Lymph Node Excision; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D010412:Penile Neoplasms / Q000473:pathology* / Q000601:surgery; D010413:Penis / Q000473:pathology* / Q000601:surgery; D011379:Prognosis; D012307:Risk Factors