The court is holding three days of hearings to determine the fitness of three former leaders later this year or into the next.
A tribunal official told the former soldiers in Samlot that the two cases were still under consideration at the tribunal.
Tan Sokhun, a doctor and head of the technical section of La Sante said there was little hope of recovery.
Next week, the court will discuss recent medical reports examining the physical abilities of three defendants to stand trial.
Allowing the publication of that submission will further help victims who wish to be a part of the case, tribunal monitors said Monday.
In an exclusive interview in July, Meas Muth told VOA Khmer any accusations against him were not legal under the rules of the court.
Nuon Chea, who is now 85, and Ieng Thirith, 79, will go before the Khmer Rouge Trial Chamber.
In an exclusive, rare interview with VOA Khmer in July, Ta An Ta An denied overseeing major purges during the Khmer Rouge period.
According to prosecutors, Im Chaem took part in leading a purge of the Northwest Zone beginning in June 1977.
Between 500 and 700 Khmer Krom were killed at the site, according to the Documentation Center of Cambodia.
Victims of the regime had complained they cannot properly file as civil parties without knowing which sites are under investigation.
Questions over the handling of cases 003 and 004 have divided the Khmer Rouge tribunal (ECCC).