GSTM1 and cancer: Furthermore, critical values such as very low Hb (OR 2.8), very high CRP (OR 3.6), very high B12 vitamin (OR 3.2), and very high total (OR 5.6) and ionised calcium (OR 1.8) were associated with cancer, but values such as very low eGFR and very high HbA1c were not.