背景：继发恶性肿瘤是遗传性视网膜母细胞瘤生存者早死主要原因。
Background: Subsequent malignant neoplasms are a major cause of premature death in survivors of hereditary retinoblastoma.
继发的恶性肿瘤可以是血行转移或直接侵犯而来。
Secondary malignant tumors can occur by hematogenous spread or direct invasion.
继发的恶性肿瘤可以是血行转移或直接侵犯而来。
Secondary malignant tumors can occur by hematogenous spread or direct invasion.
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