A tumour marker of 6.5 (CEA), does it necessarily mean cancer?

Hello everyone.My mother recently observed an elargement of one of her lymph nodes at the base of her neck.She had her blood tested yesterday but everything was normal apart from her tumour markers.It was 6.5.Does this necessarily mean cancer or can markers go up due to another reasons as well?For example, can an... show more Hello everyone.My mother recently observed an elargement of one of her lymph nodes at the base of her neck.She had her blood tested yesterday but everything was normal apart from her tumour markers.It was 6.5.Does this necessarily mean cancer or can markers go up due to another reasons as well?For example, can an elargement of a lymph nodes make your tumour markers go up?
Thanks in advance!
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