Sentinel Lymph Node Biopsy vs. Observation in Thin Melanoma: A Multicenter Propensity Score Matching Study.

The therapeutic value of sentinel lymph node biopsy (SLNB) in thin melanoma remains controversial. The aim of this study is to determine the role of SLNB in the survival of thin melanomas (≤1 mm). A multicenter retrospective observational study was designed. A propensity score matching was performed to compare patients who underwent SLNB vs. observation. A multivariate Cox regression was used. A total of 1438 patients were matched by propensity score. There were no significant differences in melanoma-specific survival (MSS) between the SLNB and observation groups. Predictors of MSS in the multivariate model were age, tumor thickness, ulceration, and interferon treatment. Results were similar for disease-free survival and overall survival. The 5- and 10-year MSS rates for SLN-negative and -positive patients were 98.5% vs. 77.3% (p < 0.001) and 97.3% vs. 68.7% (p < 0.001), respectively. SLNB does not improve MSS in patients with thin melanoma. It also had no impact on DSF or OS. However, a considerable difference in MSS, DFS, and OS between SLN-positive and -negative patients exists, confirming its value as a prognostic procedure and therefore we recommend discussing the option of SLNB with patients.

Survival analysis and sentinel lymph node status in thin cutaneous melanoma: A multicenter observational study.

Mitotic rate is no longer considered a staging criterion for thin melanoma in the 8th edition of the American Joint Committee on Cancer Staging Manual. The aim of this observational study was to identify prognostic factors for thin melanoma and predictors and prognostic significance of sentinel lymph node (SLN) involvement in a large multicenter cohort of patients with melanoma from nine tertiary care hospitals. A total of 4249 consecutive patients with thin melanoma diagnosed from January 1, 1998 to December 31, 2016 were included. The main outcomes were disease-free interval and melanoma-specific survival for the overall population and predictors of SLN metastasis (n = 1083). Associations between survival and SLN status and different clinical and pathologic variables (sex, age, tumor location, mitosis, ulceration, regression, lymphovascular invasion, histologic subtype, Clark level, and Breslow thickness) were analyzed by Cox proportional hazards regression and logistic regression. SLN status was the most important prognostic factor for melanoma-specific survival (hazard ratio, 13.8; 95% CI, 6.1-31.2; P < 0.001), followed by sex, ulceration, and Clark level for patients who underwent SLNB. A mitotic rate of >2 mitoses/mm2 was the only factor associated with a positive SLN biopsy (odds ratio, 2.9; 95% CI, 1.22-7; P = 0.01. SLN status is the most important prognostic factor in thin melanoma. A high mitotic rate is associated with metastatic SLN involvement. SLN biopsy should be discussed and recommended in patients with thin melanoma and a high mitotic rate.

Sentinel lymph node biopsy versus observation in thick melanoma: A multicenter propensity score matching study.

The clinical value of sentinel lymph node (SLN) biopsy in thick melanoma patients (Breslow >4 mm) has not been sufficiently studied. The aim of the study is to evaluate whether SLN biopsy increases survival in patients with thick cutaneous melanoma, and, as a secondary objective, to investigate correlations between survival and lymph node status. We included 1,211 consecutive patients with thick melanomas (>4 mm) registered in the participating hospitals' melanoma databases between 1997 and 2015. Median follow-up was 40 months. Of these patients, 752 were matched into pairs by propensity scores based on sex, age, tumor location, histologic features of melanoma, year of diagnosis, hospital and adjuvant interferon therapy. The SLN biopsy vs. observation was associated with better DFS [adjusted hazard ratio (AHR), 0.74; 95% confidence interval (CI) 0.61-0.90); p = 0.002] and OS (AHR, 0.75; 95% CI, 0.60-0.94; p = 0.013) but not MSS (AHR, 0.84; 95% CI, 0.65-1.08; p = 0.165). SLN-negative patients had better 5- and 10-year MSS compared with SLN-positive patients (65.4 vs. 51.9% and 48.3 vs. 38.8%; p = 0.01, respectively). As a conclusion, SLN biopsy was associated with better DFS but not MSS in thick melanoma patients after adjustment for classic prognostic factors. SLN biopsy is useful for stratifying these patients into different prognostic groups.

The intriguing effect of delay time to sentinel lymph node biopsy on survival: a propensity score matching study on a cohort of melanoma patients.

BACKGROUND: Time between primary melanoma excision and sentinel lymph node biopsy (SLNB) has not been sufficiently studied as an independent predictor of survival in cutaneous melanoma. OBJECTIVES: We used propensity score matching to evaluate whether early SLNB (performed ≤40 days from excisional biopsy) is associated with higher mortality in patients with cutaneous melanoma. MATERIALS & METHODS: A retrospective cohort study at a tertiary melanoma referral centre. We included 787 consecutive patients from the melanoma database of the Instituto Valenciano de Oncología who underwent a SLNB between 1st January 2000 and 31st December 2015, of whom 350 were matched into pairs using propensity score matching. The variable of interest was the time between primary melanoma excision and SLNB (≤40 days vs >40 days). The study outcomes were disease-free survival (DFS), melanoma-specific survival (MSS), and overall survival (OS). RESULTS: A delay time of 40 days or less was associated with worse DSF (adjusted hazard ratio [AHR]: 1.68; 95% confidence interval [CI]: 1.07-2.65; p = 0.024), MSS (AHR: 2.06; 95% CI: 1.1-3.53; p = 0.08), and OS (AHR: 1.77; 95% CI: 1.11-2.83; p = 0.017). Other variables associated with shorter MSS were age, tumour location and thickness, mitotic rate, and SLN status. CONCLUSION: Early SLNB was associated with worse survival in patients with cutaneous melanoma after adjusting for classic prognostic factors. A delay time of over 40 days was not associated with higher mortality.

Value of sentinel lymph node biopsy and adjuvant interferon treatment in thick (>4 mm) cutaneous melanoma: an observational study.

BACKGROUND: The role of sentinel lymph node biopsy and the benefit of immunotherapy with interferon in thick (>4 mm) melanomas remain uncertain. OBJECTIVES: Our aim was to assess the value of both sentinel lymph node (SLN) biopsy and immunotherapy in the prognosis of thick melanomas. METHODS: A retrospective study based on a computerized patient database in which patients have been prospectively collected since 2005 was performed. Age, sex, location, Breslow thickness, tumor ulceration, regression, Clark level, tumor infiltrating lymphocytes, tumor mitotic rate, microscopic satellite and vascular invasion were included in the analysis. Disease-free (DFS), disease-specific (DSS) and overall (OS) survivals were evaluated by the Kaplan-Meier method and Cox regression analysis. RESULTS: A series of 141 patients with melanomas thicker than 4 mm were included. Multivariate regression showed a worse prognosis in SLN-positive patients with respect to SLN biopsy-negative patients (DFS, hazard ratio [HR] 2, p = 0.04; DSS, HR 2.2, p = 0.002; OS, HR 2.4, p = 0.02). The observational group was shown to have a worse prognosis than the SLN-positive group but was very similar to the clinically positive group. Immunotherapy with high-dose interferon showed a protective effect (DFS, HR 0.5, p = 0.02; DSS, HR 0.3, p = 0.001; OS, HR 0.3, p = 0.001). CONCLUSION: Our data indicate that SLN biopsy and adjuvant interferon should be considered for patients with thick melanomas.

Effect of time to sentinel-node biopsy on the prognosis of cutaneous melanoma.

INTRODUCTION: In patients with primary cutaneous melanoma, there is generally a delay between excisional biopsy of the primary tumour and sentinel-node biopsy. The objective of this study is to analyse the prognostic implications of this delay. PATIENTS AND METHOD: This was an observational, retrospective, cohort study in four tertiary referral hospitals. A total of 1963 patients were included. The factor of interest was the interval between the date of the excisional biopsy of the primary melanoma and the date of the sentinel-node biopsy (delay time) in the prognosis. The primary outcome was melanoma-specific survival and disease-free survival. RESULTS: A delay time of 40 days or less (hazard ratio (HR), 1.7; confidence interval (CI), 1.2-2.5) increased Breslow thickness (Breslow ⩾ 2 mm, HR, > 3.7; CI, 1.4-10.7), ulceration (HR, 1.6; CI, 1.1-2.3), sentinel-node metastasis (HR, 2.9; CI, 1.9-4.2), and primary melanoma localised in the head or neck were independently associated with worse melanoma-specific survival (all P < 0.03). The stratified analysis showed that the effect of delay time was at the expense of the patients with a negative sentinel-node biopsy and without regression. CONCLUSION: Early sentinel-node biopsy is associated with worse survival in patients with cutaneous melanoma.

Carcinoma ductal salival: claves diagnósticas, histología y tratamiento / Salivary duct carcinoma: diagnostic clues, histology and treatment

El carcinoma ductal salival es un tumor epitelial de alto grado, muy poco frecuente. Presentamos el caso de un varón de 75 años con carcinoma ductal salival de rápido crecimiento, en la glándula parótida, de un mes de evolución. Histopatológicamente se caracteriza por su gran similitud con el carcinoma ductal de mama. Suele tener un comportamiento muy agresivo, con recurrencia local y metástasis a distancia tempranas, por lo que hay que realizar parotidectomía total con vaciamiento cervical ipsilateral y radioterapia adyuvante. En casos avanzados se recomienda tratamiento con anticuerpo monoclonal selectivo para el HER-2/neu como trastuzumab (AU)

Salivary duct carcinoma is a very rare, highly-malignant epithelial tumour. We present a case of a 75-year-old man with a rapidly- growing salivary duct carcinoma in the parotid gland, of one month's evolution. Histopathologically, salivary duct carcinoma is characterised by its resemblance to ductal carcinoma of the breast. It usually develops aggressively with possibilities of early distant metastasis and local recurrence. The tumour is managed with total parotidectomy, ipsilateral neck dissection and adjunctive radiation. In advanced cases, we recommend treatment with anti-Her-2 monoclonal antibodies such as trastuzumab (AU)

Salivary duct carcinoma: diagnostic clues, histology and treatment.

Salivary duct carcinoma is a very rare, highly-malignant epithelial tumour. We present a case of a 75-year-old man with a rapidly- growing salivary duct carcinoma in the parotid gland, of one month's evolution. Histopathologically, salivary duct carcinoma is characterised by its resemblance to ductal carcinoma of the breast. It usually develops aggressively with possibilities of early distant metastasis and local recurrence. The tumour is managed with total parotidectomy, ipsilateral neck dissection and adjunctive radiation. In advanced cases, we recommend treatment with anti-Her-2 monoclonal antibodies such as trastuzumab.