HOTAIR and neoplasm: Furthermore, the expression of miR‐613 was evidently lower in retinoblastoma patients with tumours that were located bilaterally, poorly or non‐differentiated, larger than 10 mm, classified as T3 or T4 and were with lymph nodal metastasis (P < 0.05), whereas the expressions of HOTAIR was enormously higher within the above tumours than ones that were located unilaterally, well or moderately differentiated, <10 mm, classified as T1 or T2 and were without lymph nodal metastasis (P < 0.05) (Table 2).