Cytokeratin 20 positive circulating tumor cells are a marker for response after neoadjuvant chemoradiation but not for prognosis in patients with rectal cancer

Table 1 Patient characteristics

Characteristics	Category	Number	Percent
Sex	Male	141	52.8
	Female	126	47.2
Age	Years^a	64.4 (30–90)
UICC stage	I	82	30.7
	II	72	27
	III	85	31.8
	IV	28	10.5
Neoadjuvant RCTX	Yes	79	29.6
	No	188	70.4
Adjuvant RCTX	Yes	63	23.5
	No	204	76.5
Responder RCTX	Yes	22	27.8
	No	57	72.2
Tumor localisation	Upper 1/3	94	35.2
	Middle 1/3	109	40.8
	Lower 1/3	63	23.6
Blood CK20	Negative	173	64.8
	Positive	80	30
	Not done	14	5.2

ISSN: 1471-2407