#1	MeSH descriptor Leukemia, B‐Cell explode all trees
#2	MeSH descriptor Leukemia, Lymphocytic, Chronic, B‐Cell explode all trees
#3	(leu*em* NEAR/ lymphocyt*) or (leu*em* NEAR/ lymphoblast*) or (leu*em* NEAR/ linfoid*) or (leu*em* NEAR/ b‐cell*)
#4	(leu*em* NEAR/ lymphocyt*) or (leu*em* NEAR/ lymphoblast*) or (leu*em* NEAR/ linfoid*) or (leu*em* NEAR/ b‐cell*)
#5	(lymph* NEAR/ lymphocyt*) or (lymph* NEAR/ lymphoblast*) or (lymph* NEAR/ linfoid*) or (lymph* NEAR/ b‐cell*)
#6	(chronic*) or (cronic*) or (chroniq*) or (well‐differential*)
#7	(#6 AND ( #3 OR #4 OR #5 ))
#8	(lymphom*) and (small cell* or small‐cell*)
#9	(lymphom* NEAR/2 lymphocyt*)
#10	(lymphoplasma*ytoid*)
#11	(cll or sll)
#12	(#1 OR #2 OR #7 OR #8 OR #9 OR #10 OR #11)
#13	MeSH descriptor Antimetabolites explode all trees
#14	purin* near/2 analog*
#15	MeSH descriptor Pentostatin explode all trees
#16	pentostatin*
#17	lederl*
#18	prasfarm*
#19	supergen*
#20	wyet*
#21	nipet*
#22	nipent*
#23	deoxycoformycin*
#24	(ci‐825 or ci825)
#25	(nsc‐218321 or nsc218321)
#26	(pd‐81565 or pd81565)
#27	(co‐vidarabin* or covidarabin*)
#28	dcf*
#29	(#14 OR #15 OR #16 OR #17 OR #18 OR #19 OR #20 OR #21 OR #22 OR #23 OR #24 OR #25 OR #26 OR #27 OR #28)
#30	MeSH descriptor Cladribine explode all trees
#31	cladribin*
#32	litak*
#33	movectro*
#34	leustat*
#35	chlorodeoxyadenosin*
#36	deoxyadenosin*
#37	chloroadenosin*
#38	(2‐cda* or 2cda*)
#39	(rwj‐26251* or rwj26251*)
#40	(#30 OR #31 OR #32 OR #33 OR #34 OR #35 OR #36 OR #37 OR #38 OR #39)
#41	Fludarabin*
#42	fludara*
#43	fluoro‐ara*.
#44	amp*
#45	amp*
#46	(#41 OR #42 OR #43 OR #44 OR #45)
#47	(#29 OR #40 OR #46)
#48	(#12 AND #47)
#49	"accession number" near pubmed
#50	(#48 AND NOT #49)