More recently, we conducted surface plasmon resonance (SPR) analysis based on multisequential analysis using Sambucus nigra lectin (SNA‐1), AAL, and Phaseolus vulgaris lectin (PHA‐L4) to assess the glycosylation of haptoglobin, and found that SNA‐1 could effectively detect Neu5Acα2,6 in the biantennary glycans of haptoglobin in patients with prostate cancer 22. Here, HP is linked to prostate carcinoma.