What is the typical lead time for custom tumor paraffin-embedded tissue microarrays with paired adjacent normal tissue?

Quotes for this type of custom TMA are usually not based simply on the number of cases, but are affected by core diameter, number of cores, and whether pathology review is included. For 60 cases of cancer plus adjacent normal tissue, if using 1.5 mm cores with 2 cores each for cancer and adjacent normal tissue per case, that is about 240 cores; if the manufacturer packages pricing by case, the unit price may differ, so ask clearly what the unit price includes. Lead time from sample submission to sectioning is generally 4-6 weeks, including H&E quality control; IHC validation is charged separately, and you can request a small pilot sample first. Insufficient tissue in donor blocks can lead to resubmission of samples and delay the timeline. After receiving the slides, check the core integrity rate on the same day or the next day, and raise any issues within the acceptance period; replacement sections can usually be negotiated. It is recommended to confirm in writing that blocks will be retained for no less than 3 years.

The customization timeline is mainly constrained by pathological review and donor paraffin block quality. When submitting tissue blocks, it is best to also provide the original HE slides or scanned images and mark the tumor and adjacent normal regions, which can shorten the timeline by 1-2 weeks. For 60 cases, if 2 replicate cores each are taken from tumor and adjacent normal tissue per case, that is actually about 240 cores, and billing by core will be higher, but the statistics will be more robust. If the budget is limited, start with 1 core each for tumor and adjacent normal tissue, and later validate key findings using whole-slide sections. H&E confirmation is recommended to keep, to avoid empty punches or adjacent normal tissue containing tumor. IHC validation can optionally be done with a small number of cores for 2-3 markers, and it is not necessary to do all. The terms for paraffin block retention and additional sectioning should be clearly stated in the contract; storage at room temperature for 3 years is usually feasible.

When the budget is limited, it is recommended to first have the manufacturer perform H&E to confirm microarray quality. IHC validation can be done back in your own laboratory, and there is no need to purchase additional manufacturer services unless you do not have staining capabilities. For 60 paired hepatocellular carcinoma and adjacent tissue cases, I generally schedule 4-5 weeks, but time must be reserved for logistics and acceptance inspection. When requesting a quote, do not look only at the unit price; ask whether positively charged slides, baking, microarray maps or scanning quality control, and pathology information organization are included. It is also necessary to confirm whether later additional blank sectioning is free and whether paraffin blocks are retained for more than 3 years. It is recommended to cut 10-15 extra blank sections at the initial order, which saves time and cost compared with later additional sectioning. In the contract, clearly specify the delivery thickness, number of spots, handling of missing spots, and acceptance deadline.

From submitting qualified tissue blocks and pathology information to receiving the slides, the typical turnaround time in China is 4-6 weeks; if the vendor also needs to redo pathology annotation and H&E confirmation, it may add another 1-2 weeks. For your 60 cases of liver cancer plus paired adjacent tissue, it is recommended to allow 6-8 weeks. You should ask in advance whether H&E confirmation is charged separately; some customized services include one quality control slide, while additional IHC validation is usually charged separately by antibody/slide. Quotations are commonly based on either spots or cases; if cancer + adjacent tissue is 2 spots each per case, that is about 120 spots, so first have them clarify the definition of spot count. For additional blank sectioning, the paraffin blocks can generally be retained for at least 2-3 years, but additional sectioning will incur a sectioning fee, so it is better to cut 10-15 extra slides at the initial order.