[Value of the postoperative Störkel score. Predict disease-free survival of patients with surgically resected renal cell carcinoma]

OBJECTIVE

To determine the value of clinical and pathological parameters defining the Störkel score in order to predict outcomes of patients with surgically treated renal cell carcinoma (RCC).

MATERIAL AND METHODS

A total of 834 consecutive patients having radical or partial nephrectomy were retrospectively reviewed. For each patient with RCC, the prognostic Störkel score was calculated according to the following variables: Robson stage, Thoenes nuclear grading, histological type, pattern of growth, and age. Based on the Störkel score, patients were divided into groups: those with good prognosis (GP), intermediate prognosis (IP), and poor prognosis (PP). Cancer-specific survival (CSS) and overall survival (OS) were estimated using the Kaplan-Meier method. The accuracy of prediction of CSS and OS with the Störkel score was analyzed using Kaplan-Meier analysis, proportional hazards regression, and graphic representation [(Kaplan-Meier curves, area under the curve (AUC)]. In 564 patients who were still alive, the median follow-up was 79 months (mean 84.8 months).

RESULTS

In the GP, IP, and PP groups, CSS after 8 years was 86.7%, 75.6%, and 13.7%, respectively (p<0.001). In the multiple analysis, only the Robson stage and Thoenes nuclear grading independently predicted CSS. Accordingly, the prognostic accuracy of the Störkel score (CSS prediction: AUC=0.744, 95% CI=0.70-0.79) was not better than with a reduced model that included the Robson stage and grading only (CSS prediction: AUC=0.765, 95%CI=0.72-0.81).

CONCLUSIONS

Of all parameters included in the Störkel score, only the Robson stage and nuclear grading are significant prognostic factors. Hence, we recommend an accordant modification of the score with additional variables.

Management and extended outcome of patients with synchronous bilateral solid renal neoplasms in the absence of von Hippel-Lindau disease

OBJECTIVE

To gain information regarding long-term follow-up in patients with synchronous bilateral solid renal neoplasms in whom renal-preserving surgery is imperative.

PATIENTS AND METHODS

We examined our surgical experience and the survival outcome, as evaluated by Kaplan-Meier and log-rank analysis, of 94 patients (64 men and 30 women) who presented to the Mayo Clinic in Rochester, Minn, from 1973 to 1998 with bilateral synchronous solid renal neoplasms in the absence of von Hippel-Lindau disease. Follow-up of these patients ranged from 1 to 25 years, with a mean of 5.86 years and a median of 4.18 years. Tumors were staged according to the TNM classification. Pathologic staging and grading were usually performed on the kidney with the most extensive cancer. The Cox proportional hazards model was used to assess the relationship of grade (1-4), tumor size, and enucleation as opposed to extended (1 cm) partial nephrectomy on overall, cancer-specific, local recurrence-free, and metastasis-free survival.

RESULTS

Seventy-one patients (76%) had bilateral synchronous renal cell carcinoma, and 14 patients (15%) had a unilateral renal cell carcinoma with a contralateral benign solid neoplasm. Nine patients (10%) had bilateral benign solid lesions. Sixty-six patients (70%) underwent a single procedure, whereas 28 (30%) underwent staged surgical procedures. Fifty-one patients (54%) are alive, and 43 (46%) have died. Twenty patients (21%) died of metastatic disease, and 5 (5%) had a local recurrence. Cancer-specific survival of the 85 patients with at least 1 renal cell carcinoma still under observation was 81% (+/- 4.9% SE) and 59% (+/- 8.1% SE) at 5 and 10 years, respectively, and survival to local recurrence was 96% (+/- 2.6% SE) at 5 years and 93% (+/- 3.7% SE) at 10 years with 14 patients still under observation. Grade 3 was a statistically significant factor for metastasis (P < .001). A significant difference in metastasis-free survival and cancer-specific survival was noted dependent on pathologic T stage (P < .001 and P = .02, respectively), with patients with local pT3 disease having a higher rate of metastasis and cancer-specific death. Multivariate analysis revealed that tumor grade was associated with metastasis-free survival (P = .002) and tumor size with cancer-specific survival (P = .04). There was no statistical significance on survival outcome end points according to procedure performed, i.e., enucleation vs extended partial nephrectomy.

CONCLUSION

Long-term results of renal-preserving procedures for a series of patients with bilateral solid renal neoplasms indicate that grade, stage, and tumor size are significant predictors of outcome. Mean follow-up of over 5 years supports nephron-sparing techniques in selected patients because local recurrence was infrequent compared with distant metastasis.

Differential inhibition of renal cancer cell invasion mediated by fibronectin, collagen IV and laminin

Invasion of tumor cells into the extracellular matrix is an essential step in the formation of metastases in renal cancer. Cell adhesion molecules such as beta(1)-integrins, which bind to the RGD sequence (arginine-glycine-asparagine) and CD44 are involved in this process. We examined the invasion of a renal carcinoma cell line (CCF-RC1) into the extracellular matrix compounds fibronectin, collagen IV and laminin and the effect of TGFbeta and IFNgamma on this process. The inhibitory effect of an antibody against the beta(1)-subunit of integrins (CD29), as well as a pentapeptide including the RGD sequence, was also evaluated. A micro-chemotaxis chamber, including a polycarbonate membrane with a pore diameter of 8 microm, was used for quantification of cell migration. The addition of the extracellular matrix compounds fibronectin, laminin and collagen IV resulted in a 5-10-fold increase in invasion. This increased invasion depends strongly on the presence of beta(1)-integrins, shown by the use of an antibody against CD29 or a RGD including peptide which inhibit the cell migration by approximately 88%. CD44 is less involved in collagen IV dependent migration and almost no influence of CD44 was observed on a fibronectin and laminin dependent migration. TNFalpha and IFNgamma did not significantly influence the expression of CD29 or CD44, and no alteration in tumor cell migration was observed. These results show that the invasion of renal cancer cells is differentially regulated by compounds of the extracellular matrix, whereby fibronectin seems to be the most critical factor. The molecular interactions in this process are strongly dependent on beta(1)-integrins and the corresponding amino acid sequence RGD.

[Conservative parenchymal surgery in kidney neoplasms]

OBJECTIVES

To analyze retrospectively a series of 60 nephron sparing surgeries (NSS) in patients presenting with renal masses.

MATERIAL AND METHODS

The clinical histories of 59 patients undergoing NSS between january 1978 and december 1997 were reviewed. 40 were males, the mean age 54.4 years (range 17-77 years). 10 (17%) had bilateral synchronous tumors, 15 (25%) had a solitary kidney and 3 a renal insufficiency. In 25 patients NSS was obligatory, while in 34 it was elective. 30 (50%) of the renal masses had been diagnosed incidentally. Overall, 49 kidneys underwent an enucleation and 11 a partial nephrectomy.

RESULTS

The histopathological exam revealed 43 (71.6%) renal cell carcinomas (RCC), 2 (3.4%) urothelial carcinomas, 6 (10.2%) oncocytomas, 7 (11.6%) angiomyolipomas and 2 (3.4%) multilocular cystic nephromas. Among the RCC, 8 had < or = 3 cm, 22 between 3.1-5 cm, 10 between 5.1-8 cm and 3 more than 8 cm. 31 (72.1%) were well encapsulated and only 2 (4.6%) invaded the nearby parenchyma. 7 (16.2%) were pT1, 34 (79%) pT2 and 2 (4.6%) pT3. 39 (90.3%) were G1 or G2, and only 4 (9.3%) were G3. Two patients (3.3%) died perioperatively, both from the obligatory group. 3 (6.8%) of the patients with malignant tumors progressed and died, all with CCR and from the obligatory surgery group. Another 3 patients of this group developed local recurrences, but were rescued with iterative surgery (conservative in 1); 2 of these patients had sporadic CCR, another a von Hippel Lindau disease. None of the 34 patients who underwent elective NSS progressed, nor recurred locally and all are alive and disease free; only 14 (56%) of the 25 patients operated on by necessity survived, although 6 of them died of causes not related with the kidney tumor. The cancer specific survival at 58.3 months of follow-up (range 5-187 months) is 86.8% for the whole series, 100% for the elective NSS group and 68.7% for the obligatory NSS group. 19 (31.6%) patients developed complications, 14 among the obligatory group; two died (hemorrhage and sepsis). 3 patients presented acute renal failure, but none required dialysis; presently 4 (6.7%) patients have poor renal function and 1 requires dialysis.

CONCLUSION

NSS affords good control of renal carcinoma; in the cases operated on electively, the 100% cause specific survival yielded by NSS supports the use of conservative surgery in patients with well delimited tumors and normal contralateral kidney.

Prognostic value of clinical parameters for renal cell carcinoma

– Clinical evaluation of patients with kidney tumours should provide several parameters with possible prognostic value, such as age, sex, incidental discovery, duration of symptoms, weight loss, fever, disease-free interval, performance status, elevated ESR, hypercalcemia, elevated gamma-enolase, local tumour extension, invasion of renal vein and inferior vena cava, lymphatic metastases, distant metastases, tumour dimension, multicentricity, bilaterality and growth velocity. Some of these factors correlate to prognosis in univariate statistical analysis; in multivariate analysis, however, tumour stage is the best prognostic factor, while the other parameters show less or no prognostic value. Besides tumour stage, parameters with an independent value are performance status, weight loss, elevated ESR. Using these prognostic factors, patients can be divided into groups with different prognosis and treatment.

Prognostic significance of nuclear DNA content and proliferative activity in renal cell carcinomas. A clinicopathologic study of 58 patients using mitotic count, MIB-1 staining, and DNA cytophotometry

BACKGROUND

For a variety of human malignancies, static DNA cytophotometry and immunostaining for the Ki-67 antigen using the antibody MIB-1 have provided significant prognostic information.

METHODS

Surgical specimens of 58 renal cell carcinomas (RCCs) were investigated by conventional histology, DNA cytophotometry, and MIB-1 immunostaining.

RESULTS

The MIB-1 indices and DNA data were found not only to be significantly correlated with various other morphologic parameters, but also to the clinical behavior of RCC. In the course of this study (median observation period: 31 months), 27% of patients died from RCC. None of these patients belonged to the group of 37 patients with RCCs exhibiting diploid or euploid DNA histograms. Lethal outcome occurred in only 16 of the 21 patients (76%) with noneuploid or aneuploid histogram tumors (P < 0.0001). According to their MIB-1 indices and upon choosing different cutoff levels, the 58 RCCs were categorized into 2 groups with either low or high proliferative activity. Using the median and the mean MIB-1 index as cutoffs, none of the patients with tumors showing low proliferative activity had died, whereas 16 of 29 patients (55%) or, respectively, 16 of 25 patients (64%) with tumors exhibiting high proliferative activity, had died from RCC (P < 0.0001).

CONCLUSIONS

In addition to tumor grade and stage, both a high MIB-1 index and a noneuploid or aneuploid DNA histogram of a given RCC have the potential to identify tumor patients with an impaired prognosis.

Prognostic value of ploidy and proliferation markers in renal cell carcinoma

BACKGROUND

The prognosis for patients with renal cell carcinoma depends mainly on pathological stage and grade of the tumor at the time of surgery. Cellular proliferation may prove to be another measure for predicting biologic aggressiveness and, therefore, the prognosis.

METHODS

The authors compared four different methods to assess proliferation in a series of 87 curatively resected (R0) renal cell carcinomas: flow cytometry analysis (FCM), silver-stained nucleolar organizer regions (AgNOR), and immunohistochemical assessment of the MIB-1 (Ki-67) antigen, and proliferating cell nuclear antigen (PCNA). The results obtained were compared with pathologic stage (according to the International Union Against Cancer [UICC]) and grade with disease-related survival rate; finally, we assessed whether the methods led to similar results.

RESULTS

In each carcinoma examined, we could demonstrate MIB-1, PCNA, and AgNOR dots in varied proportions. Statistical correlations were seen between the tumor grade, the rate of nuclear positivity for MIB-1 and PCNA, and the number of AgNOR dots. Additionally, the MIB-1 index was significantly higher in more advanced tumor stages. A good correlation between MIB-1 and AgNOR as well as for PCNA was found. In univariate survival analysis, tumor stage and grade, MIB-1 and PCNA index, and mean AgNOR number were related significantly to patient survival. On multivariate Cox disease-related survival analysis, stage of disease and MIB-1 were significant independent prognostic factors. Flow cytometry was not related to prognosis nor to other examined parameters.

CONCLUSIONS

These results indicated that MIB-1 immunostaining is an additional prognostic parameter for patient outcome. MIB-1 and PCNA immunostaining, as well as AgNOR, demonstrated good correlations among themselves. We failed to establish flow cytometry as a method to predict proliferative capacity or prognosis in renal cell carcinoma patients.

Significance of conventional and new prognostic factors for locally confined renal cell carcinoma

BACKGROUND

The prognosis of patients with locally confined renal cell carcinoma is variable. To improve the prognostic knowledge and select patients at high risk, additional prognostic parameters are needed.

METHODS

The significance with respect to survival and tumor recurrence of "classic" and "new" prognostic parameters has been examined by following 41 patients with locally confined renal cell carcinoma after nephrectomy (mean follow-up, 5.2 years). The significance of histologic grade, tumor stage, Ki-67 index, proliferating cell nuclear antigen index, 3H-thymidine labeling index, tumor ploidy status, and tumor growth after xenotransplantation into nude mice (GAX range) was tested using the Kaplan-Meier plots by the log rank test or Tarone's test and also by the Cox multiple hazard regression analysis.

RESULTS

Tumor stage (P < 0.0025), histologic grade (P < 0.005), Ki-67 index (P < 0.006), and GAX range (P < 0.00004) were found to be significant prognostic parameters for survival and tumor recurrence using single-factor analysis. Applying the multivariate analysis, the combination of the "new" factors, GAX range and Ki-67 index, resulted in even a higher prognostic relevance than the combination of the "classic" prognostic factors, tumor stage and histologic grade. The calculated prognostic index based on the results of the Cox analysis, which, except for stage and grade, included the Ki-67 index, was shown to be highly correlated with survival (P = 0.00002) and tumor recurrence (P = 0.0004). Its prognostic validity was studied with the receiver operating characteristics procedure and was found to be considerably superior to that of the two conventional prognosticators.

CONCLUSIONS

The additional determination of the Ki-67 labeling index increases the prognostic assessment of patients with locally confined renal cell carcinoma.

Multifocal renal cell tumors: a retrospective analysis of 56 patients treated with radical nephrectomy

In this retrospective analysis of 56 patients with multifocal renal cell tumors the effect of secondary tumors on the prognosis was examined and the incidence of tumors in the contralateral kidney was evaluated. All of the primary tumors were renal cell carcinomas, the majority of which had a local tumor stage of pT2 (31 cases, 55.3%) and a cytological grading of 1 (23 cases, 41%). The mean size of the secondary tumors was 1.0 cm. An additional tumor was diagnosed in 23 patients (41%), 2 to 5 secondary tumors in 23 (41%) and more than 5 additional tumors in 10 (18%). The overall 5-year survival rates were 69.4%, 72.2% and 40%, respectively (p = 0.313). Histopathological differentiation of the additional lesions revealed 23.2% renal cell carcinomas, 71.4% adenomas and 5.3% renal tumors of "doubtful dignity," with overall 5-year survival rates of 67.2% for adenomas, and 60.6% for carcinomas and renal tumors of "doubtful dignity" (p = 0.546). After a mean followup of 60 months 33 patients (58.9%) were alive without evidence of disease, 1 (1.7%) was alive with tumor progression, 8 (14.2%) died of the disease and 14 (25%) died of other causes; only 1 patient presented with a tumor in the contralateral kidney (incidence 1.7%). Thus, the overall 5-year survival rate for the entire group was 66.0% and the histopathological parameters of the additional tumors had no effect on the prognosis of the patients.