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. 2019 Sep 2;26(3):1539–1547. doi: 10.1007/s12253-019-00734-w

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© The Author(s) 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 1 — a Serotonin receptor 1B (5-HTR1B), b serotonin receptor 2B (5-HTR2B), c dopamine receptor D1 (DRD1), d and dopamine receptor D2 (DRD2) expression on tumour cells of colon cancer (CC) (n = 12), ovarian cancer (OC) (n = 12), breast cancer (BC) (n = 12), renal cell carcinoma (RCC) (n = 14), pancreatic cancer (PC) (n = 12), melanoma (M) (n = 36), pheochromocytoma (PCC) (n = 63) and gastrointestinal stromal tumours (GIST) (n = 76) as analysed with immunohistochemistry. Immunoreactive score (IRS) was used to classify receptor expression on tumour cells in three categories: negative (in white), low (in light grey) or high (in dark grey)