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?
Select one of the following: