A 45 year old female presents with puffy fingers, a symmetrical arthritis of the small joints of her hands, proximal weakness and Raynaud’s phenomenon. Her initial blood tests are as follows:
CK 2000
ALP 180
ALT 160
GGT 150
ANA 1:1640 speckled pattern
She has positive antibodies to RNP, but antibodies to Jo‐1, Sm, Ro, La, and Scl‐70 are negative.
What is the most likely diagnosis?
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