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HelpTest Code CLD18 Claudin 18 (CLDN18) (43-14A), Semi-Quantitative Immunohistochemistry, Manual
Shipping Instructions
Attach the green "Attention Pathology" address label (T498) to the outside of the transport container before putting into the courier mailer.
Necessary Information
A pathology/diagnostic report and a brief history are required.
Specimen Required
Specimen Type: Tissue
Supplies: Pathology Packaging Kit (T554)
Collection Instructions: Formalin-fixed, paraffin-embedded tissue block; or 3 unstained glass, "positively charged" slides with 4-microns formalin-fixed, paraffin-embedded tissue
Additional Information: One slide will be stained with hematoxylin and eosin and returned.
Useful For
Identification of tumor cells expressing claudin 18
As an aid in screening patients who may be eligible for VYLOY (zolbetuximab) treatment
Method Name
Immunohistochemistry (IHC)
Reporting Name
CLDN18, SemiQuant IHC, ManualSpecimen Type
SpecialSpecimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Special | Ambient (preferred) | ||
| Refrigerated | |||
Reference Values
An interpretive report will be provided.
Interpretation
Claudin 18.2 is a biomarker for gastric and gastroesophageal junction cancer. When positive (defined as at least moderate membranous staining in greater than or equal to 75% of viable tumor cells), it predicts response to zolbetuximab which has been approved for the treatment of gastric and gastroesophageal adenocarcinoma.
Clinical Reference
1. Kubota Y, Kawazoe A, Mishima S, et al. Comprehensive clinical and molecular characterization of claudin 18.2 expression in advanced gastric or gastroesophageal junction cancer. ESMO Open. 2023;8(1):100762
2. Cao W, Xing H, Li Y, et Al. Claudin18.2 is a novel molecular biomarker for tumor-targeted immunotherapy. Biomark Res. 2022;10(1):38
3. Pellino A, Brignola S, Riello E, et al. Association of CLDN18 protein expression with clinicopathological features and prognosis in advanced gastric and gastroesophageal junction adenocarcinomas. J Pers Med. 2021;11(11):1095
4. Arnold A, Daum S, von Winterfeld M, et al. Prognostic impact of Claudin 18.2 in gastric and esophageal adenocarcinomas. Clin Transl Oncol. 2020;22(12):2357-2363
Day(s) Performed
Monday through Friday
Report Available
5 to 7 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
88360
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| CLD18 | CLDN18, SemiQuant IHC, Manual | 105011-1 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| 620666 | Interpretation | 50595-8 |
| 621004 | Participated in the Interpretation | No LOINC Needed |
| 621005 | Report electronically signed by | 19139-5 |
| 621006 | Material Received | 81178-6 |
| 621007 | Disclaimer | 62364-5 |
| 621008 | Case Number | 80398-1 |
Forms
If not ordering electronically, complete, print, and send a Immunohistochemical (IHC)/In Situ Hybridization (ISH) Stains Request (T763) with the specimen.