I need to know that if clinical trials are been conducted by a collaborative Institute (not at our facility) and they already have the "Clinical trial registry (CTRI) number", can we use that same CTRI number for our HMSC approval?
You may. There is nothing wrong trying once. Submit the proposal with ICMR (secretriat to HMSC) quoting CTRI reg no which is already assigned. I have firm belief that it should work.