RB1 and myelofibrosis: A primary myelofibrosis patient (#29) showed a non-complex der(1;7) karyotype; however, aCGH revealed four additional submicroscopic deletions (% of cells showing the deletion by I-FISH in parentheses): a ~300-kb 5q32/TCERG1 deletion (77%); a 380-kb 12p13.1 deletion (~10%); a 1.65-Mb deletion at 13q14.2q14.3 (91%) using a probe for RB1; and a 835-kb NF1/17q11.2 deletion (75%).