Riaz, O.; Mahmood, A.; Ahmed Alvi, Z.; Gul, , S.; Rasul, S.; Haider, N. FREQUENCY OF INCREASE IN SERUM TUMOR MARKER CARCINOEMBRYONIC ANTIGEN (CEA) LEVELS IN PRIMARY BREAST CANCER (PBC) PATIENTS AT THE TIME OF DIAGNOSIS: Serum Tumor Marker Carcinoembryonic Antigen Levels in PBC. PAFMJ 2017, 67, 322-26.