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Associations among synchronous and metachronous tumors. (A) Number of patients with synchronous tumors derived from the relative systems. (B) Number of patients with metachronous tumors derived from the relative systems. 1—Digestive system, 2—respiratory system, 3—hematopoietic and lymphoid system, 4—breast tissue, 5—urogenital system, and 6—others.
