On [**2781-9-17**], a lumbar puncture was performed which was negative for malignant cells.
 Patient has cancer
(ROOT (FRAG (SBAR (IN On) (SINV (-LRB- -LSB-) (NP (NP (SYM **) (CD 2781-9-17) (X (SYM **)) (-RRB- -RSB-)) (, ,) (S (NP (DT a) (JJ lumbar) (NN puncture)) (VP (VBD was) (VP (VBN performed) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (ADJP (JJ negative) (PP (IN for) (NP (JJ malignant) (NNS cells))))))))))))) (. .)))
(ROOT (S (NP (NN Patient)) (VP (VBZ has) (NP (NN cancer)))))
( ( On ( -LSB- ( ( ( ** ( ( 2781-9-17 ** ) -RSB- ) ) , ) ( ( a ( lumbar puncture ) ) ( was ( performed ( which ( was ( negative ( for ( malignant cells ) ) ) ) ) ) ) ) ) ) ) . )
( Patient ( has cancer ) )