The Influence of Lymphovascular Invasion on T Stage Upstaging and Overall Survival in Renal Cell Carcinoma: A Population-Based Study

Introduction

Lymphovascular invasion (LVI) is a recognized adverse pathological feature in renal cell carcinoma (RCC). However, its impact on staging and prognosis remains poorly defined, especially across T-stage subcategories.

Patients and Methods

We analyzed surgically treated RCC patients from the National Cancer Database (NCDB), including clear cell, papillary and chromophobe RCCs. Data on pathological T-stage and LVI status were retrieved, with overall survival (OS) as the primary outcome. Kaplan-Meier curves (KMA) and log-rank test evaluated survival differences between T-stages with and without LVI. Univariable and multivariable Cox Proportional Hazard Model (CoxPH) were fitted to test the association between LVI and All-cause Mortality (ACM) and the interaction term between LVI and T-stage. Forest plots and regression lines from the CoxPH interaction hazard ratios (HR) illustrated the impact of LVI across T-stages.

Results

Among 159,387 RCC patients, 11.3% showed LVI. LVI was associated with larger and higher‐grade tumors, and increased rates of nodal and metastatic disease (P < .001). KMA showed significantly lower 5‐year OS among LVI‐positive versus LVI‐negative patients (61% vs. 85%; P < .001). Across T stages, LVI conferred a “functional upstaging” with survival of T1a+LVI approximating T1b, T1b+LVI resembling T2, T2+LVI approximating T3, and T3a+LVI mirroring T3b outcomes. At univariable and multivariable CoxPH, LVI was an independent predictor of ACM (P < .001), with forest plots indicating its highest relative impact in earlier T-stages.

Conclusion

LVI is an aggressive pathological feature in RCC that impairs survival, especially in lower‐stage tumors. Incorporating LVI status into RCC staging may refine risk stratification and guide more intensive surveillance and adjuvant management, particularly for patients with early T-stage disease.