Correlation between grade of bladder cancer with (A) number of T CD4+ lymphocytes, (B) IL‐17+ lymphocytes, (C) IL‐17+/CD4+ T lymphocyte ratio, (D) Foxp3+ lymphocytes, (E) Foxp3+/CD4+ T lymphocytes ratio, (F) AHR+ lymphocyte and (G) AHR+ cells. P‐value < 0.05 was considered statistically significant using t test